Article
Chemistry, Applied
Jingxi An, Shuang Zhang, Ruiwang Liu, Guangxu Hu, Zhiwei Zhang, Yiyu Qiu, Yanyan Zhou, Fanming Zeng, Zhongmin Su
Summary: The rare earth ion-doped fluorescent glass prepared in this study emits white light under ultraviolet excitation, with a higher yellow light/blue light value and the ability to reduce correlated color temperature. Energy transfer from Dy3+ to Eu3+ is demonstrated, achieving light emission conversion.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Inorganic & Nuclear
Guodong Fan, Luping Wang, Rongling Hu, Di Fan
Summary: A series of phosphors K1+xBa1-2xBP2O8:xEu3+ were prepared and analyzed for their luminescence properties and thermal stability through XRD, SEM, and PL, showing excellent performance with Eu3+ at x=0.10 being the optimal doping concentration.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Optics
Pengfei Yu, Ruirui Cui, Gangyi Zhang, Jun Zhang, Chaoyong Deng
Summary: A series of Sr3In2WO9:xSm3+ (x = 0.02, 0.03, 0.04, 0.05, and 0.06) and Sr3In2WO9:0.04Sm3+, yEu3+ (y = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, and 0.35) phosphors were synthesized by solid-state reaction method. Then the microstructure and optical properties of samples were tested by the corresponding means. The results show that the optimal doping concentration of single-doped Sm3+ phosphor is x = 0.04 and the performance of Sm3+/ Eu3+ co-doped phosphors has been improved.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
S. Ling, F. B. Xiong, W. B. Yang, H. F. Lin, W. Z. Zhu
Summary: Novel red-emitting phosphors Sr7Sb2O12: Sm3+ and Sr7Sb2O12: Sm3+, Eu3+ were synthesized and characterized. Energy transfer between Sm3+ and Eu3+ ions in Sr7Sb2O12 was achieved with a transfer efficiency of 42.4%. The phosphor exhibited good thermal stability and produced white light when combined with near-UV or blue chips in LED lamps.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Naina Lohia, Swati Bishnoi, Govind Gupta, Lalit Goswami, Shailesh Narain Sharma, D. Haranath
Summary: We report a novel approach for the synthesis of single-phase BaZnO2:Eu3+ nano-phosphor, which is rapid and cost-effective using a hot-injection technique without a vacuum system. The synthesized nano-phosphor exhibited trigonal crystal structure and oval-shaped morphology, with good thermal stability and high color purity. This study provides a new option for synthesizing white light-emitting diodes at low temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Optics
Huidong Tang, Tao Zhang, Longzhu Li, Yuwei Chen, Feifei Li
Summary: Eu3+-doped La2Ti6O15 nanoparticles were prepared via sol-gel process and demonstrated excellent luminescence and thermal stability. These phosphors show bright red luminescence and high efficiency in blue and near-UV excitation regions, making them potential candidates for high-power warm white-LED applications.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Pedinti Shahab Khan, Bungala Chinna Jamalaiah, Mula Jayasimha, Harpreet Kaur, Napa Madhu, Poreddy Raghupathi
Summary: The SGPEux phosphors were successfully synthesized using a modified citrate-gel combustion method, with optimized synthesis conditions determined through thermogravimetric and differential scanning calorimetry. Characterization of the synthesized phosphors revealed a BCC crystal structure with various bonds identified through Fourier transform infrared spectroscopy. Luminescence analysis showed that the 2.0 mol% Eu(3+ )doped SGPEux phosphor was efficient for designing new class of white LED sources.
Article
Chemistry, Physical
O. Shantajit Singh, Ranjoy Wangkhem, N. Yaiphaba, Th David Singh, N. Shanta Singh
Summary: Bi3+-sensitized Gd2O3:Eu3+ phosphors were synthesized hydrothermally, and the lattice substitution of Bi3+ in Gd2O3 resulted in efficient energy transfer to the excited states of Eu3+. The color emission can be tuned by changing the activator concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
K. Indumathi, S. Tamilselvan, L. Rajasekaran, A. Duke John David, G. Shakil Muhammad, G. Ramalingam, M. Biruntha
Summary: The research focuses on a series of Sr3Gd(1-x)[PO4](3:x)Eu3+ phosphors, revealing their efficient excitation by ultraviolet visible light leading to red emission, high fluorescence lifetime, and significant CIE value, making them suitable for near-ultraviolet white light-emitting LEDs.
Article
Chemistry, Physical
Xiaofang Yu, Zhiyi Wang, Qingran Wang, Xiaoyun Mi
Summary: The Ca2P2O7: Dy3+, Eu3+ phosphors were synthesized using a hydrothermal method. By adjusting the pH value and sintering temperature, the sample with the best luminescence property was obtained. Doping of Eu3+ ions increased the red emission of the samples and resulted in warm white emission.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Optics
H. Desirena, J. Molina, O. Meza, A. Benitez, J. Bujdud-Perez, J. Briones-Hernandez
Summary: A phosphor for near ultraviolet (n-UV) based white light emitting diodes (wLED) with low correlated color temperature (CCT) and high CRI was designed using highly Eu3+ activated tellurite samples. Glass ceramic (GC) containing Eu2Te6O15 microcrystals were prepared through crystallization time control, and showed improved luminescence properties. The heavily Eu3+ doped samples achieved the maximum luminous efficacy (LE) after 4 hours of crystallization time. A white light-emitting diode constructed with a green phosphor on top of these samples showed tunable CCT and decreasing LE with increasing crystallization time.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Physical
Ziqian Lv, Hanyu Xu, Zhiying Wang, Mochen Jia, Yanling Wei, Zuoling Fu
Summary: The research introduces a method to encapsulate CDs on the surface of KLM: Eu3+ to avoid aggregation-induced quenching in the solid state, and achieve the fabrication of a polychromatic nanoplatform emitting white light in multiple colors. By adjusting the proportion of the mixture, warm, neutral, and cold white light can be emitted, and a multi-mode information encryption approach has been designed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Hao Xu, Wei Zhu, Mingliang Tang, Xiangyuan Wang, Yin Zhang
Summary: This study investigated a multi-component oxide glass consisting of 50B(2)O(3)-(25-x)Al2O3-10Na(2)O-xBi(2)O(3)-15CaF(2)-0.5Dy-0.5Eu (x = 0 , 5 , 10 , 15 , 20 , 25 mol%). The fluoroborate glass exhibited non-crystallinity, as confirmed by X-Ray diffraction. FTIR spectra revealed the structural properties of the glass, characterized by the stretching and vibrating groups of various boric groups. The optical band gap measurements confirmed the presence of unbridged oxygen (NBOs) in the glass samples. The refractive index of the fluoroborate glass increased with the Bi2O3 content, and the glass exhibited strong emission in the blue, yellow, and red range. The emission spectra were analyzed to calculate chromaticity coordinates, color temperature, color rendering index, and color purity. By adjusting the Bi2O3 content and excitation wavelength, the glass was able to emit white light, making it suitable for white light-emitting diodes (WLEDs).
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Sangeeth Das Kallullathil, Tucker Carrington Jr
Summary: In this paper, the authors propose the use of the CP-MSBII eigensolver and a contraction tree to calculate vibrational spectra. The CP-MSBII eigensolver utilizes the CP format, which has a linear memory cost with respect to the number of coordinates. By breaking down the full problem into smaller sub-problems and using a contraction tree, the required rank for each sub-problem becomes small. The authors demonstrate the effectiveness of their approach by computing the vibrational energy levels of acetonitrile and ethylene oxide.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Applied
Quansheng Wu, Yujie Xie, Fang She, Quan Zhao, Jianyan Ding, Jiangcong Zhou
Summary: The CsBaB3O6:Eu3+ phosphor exhibits excellent optical properties and thermal stability, making it suitable for applications in LED and FED.
JOURNAL OF RARE EARTHS
(2021)
Article
Physics, Applied
Zhiwei Zhang, Hongjun Xiang, Lihua Tang, Weiqing Yang
Summary: Piezoelectric energy harvesting from bridge vibrations has potential for powering wireless sensors used for bridge health monitoring. This study comprehensively analyzes the performance of a piezoelectric energy harvester (PEH) subject to measured railway bridge vibrations and compares the energy storage on a capacitor using four different interface circuits.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Haitao Zhang, Yuchen Wang, Junfeng Huang, Wen Li, Xiankan Zeng, Aili Jia, Hongzhi Peng, Xiong Zhang, Weiqing Yang
Summary: Low-enthalpy and high-entropy (LEHE) electrolytes can generate free ions and high ion mobility, improving the performance of polymer electrolytes and enhancing the energy storage efficiency of lithium batteries.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Engineering, Environmental
Qungui Wang, Keli Wang, Cheng Yan, Xiankan Zeng, Xuehai Fu, Jingjing Cao, Shiyu Yang, Wen Li, Xiangrong Chen, Weiqing Yang
Summary: By decoupling the electron transport of ETLs and electron injection of TmPyPB/perovskite and TPBi/perovskite, we found that TmPyPB has a better molecular planarity bridging effect (MPBE), which increases electron transport ability and decreases injection barrier, leading to a more balanced carrier injection and improved performance of PeLEDs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Medicine, General & Internal
Hadaate Ullah, Md Belal Bin Heyat, Faijan Akhtar, Abdullah Y. Y. Muaad, Chiagoziem C. C. Ukwuoma, Muhammad Bilal, Mahdi H. H. Miraz, Mohammad Arif Sobhan Bhuiyan, Kaishun Wu, Robertas Damasevicius, Taisong Pan, Min Gao, Yuan Lin, Dakun Lai
Summary: The development of automatic monitoring and diagnosis systems for cardiac patients over the internet has been facilitated by recent advancements in wearable sensor devices. This study proposes a deep learning method using a pre-trained deep residual network, ResNet-18, to automatically identify premature ventricular contractions (PVCs) from electrocardiographs (ECGs). The results demonstrate the efficacy and generalizability of the proposed method on imbalanced datasets.
Article
Chemistry, Physical
Haichao Huang, Yanting Xie, Da Xiong, Ningjun Chen, Xiang Chu, Xinglin Jiang, Haitao Zhang, Weiqing Yang
Summary: In this study, a vertically aligned Ti3C2Tx MXene based micro-supercapacitor with excellent electrochemical performance was prepared using a liquid nitrogen-assisted freeze-drying method. The vertical arrangement of MXene sheets enables directional ion transport, leading to thickness-independent electrochemical properties even in thick films. The micro-supercapacitors exhibited a high areal capacitance of 87 mF cm(-2) at 10 mV s(-1) and excellent stability with about 87.4% retention after 10,000 charge-discharge cycles. The proposed vertical-MXene approach is scalable and can be applied to other systems involving directional transport.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Qing Wang, Zhenyu Chen, Qitian Luo, Haijian Li, Jie Li, Weiqing Yang
Summary: This study reports a simple capillary evaporation method to efficiently build high-density conductive ramie carbon with excellent conductivity and thermal stability, which can be widely used as a conductive additive. The highly graphitized microcrystals of the carbon material demonstrate high electrical conductivity and yield strength, resulting in supercapacitors with significantly increased volumetric energy density and power density.
Article
Chemistry, Multidisciplinary
Xinglin Jiang, Xinzheng Wu, Yanting Xie, Zixing Wang, Junfeng Huang, Yuanxiao Qu, Dali Mu, Xiong Zhang, Weiqing Yang, Haitao Zhang
Summary: In this work, an additive engineering method is proposed to enhance the dynamics of IL-based supercapacitors. By adding Ti3C2CTAB into EMIMBF4, the ionic conductivity of the IL electrolytes increased by 38% and the solid-liquid surface energy decreased from 18.03 to 12.37 mN m-1. This method facilitates the dissociation of electrolyte ion pairs and improves the ion-transfer capability, leading to significantly improved energy density and power density of IL-based supercapacitors.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Ningjun Chen, Zhongyi Duan, Wenrui Cai, Yongbin Wang, Ben Pu, Haichao Huang, Yanting Xie, Qi Tang, Haitao Zhang, Weiqing Yang
Summary: MXenes have gained significant attention in the fields of energy storage and sensing as emerging 2D materials. However, the previously used acid etching method for their production is time-consuming and low-yielding, making it unsuitable for large-scale manufacture. In this study, a supercritical etching method utilizing supercritical carbon dioxide is proposed, which significantly accelerates the etching rate of MAX phase and increases the yield of MXenes. This strategy enables the mass preparation of various MXenes within a few hours and provides a platform for their commercial production.
Article
Materials Science, Multidisciplinary
Zhongyi Duan, Chuqiao Hu, Weijia Liu, Jinhai Liu, Zhengyu Chu, Weiqing Yang, La Li, Guozhen Shen
Summary: In this research, a simple one-step laser scribing method is proposed to fabricate a seamlessly integrated system based on MXene. The system includes an integrated wireless charging coil, micro-supercapacitor, and photodetector. All modules are made entirely of Ti3C2Tx MXene and connected with highly conductive MXene wires without additional welding or assembling operation. The energy is received by the wireless charging coil, stored in the Zn-ion micro-supercapacitor, and used to drive the surface-modified DCTES-MXene-based photodetector, achieving complete energy cycles. This work conceptually demonstrates a simple method for designing and preparing integrated multifunctional wearable devices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Jingjing Cao, Xiankan Zeng, Shiyu Yang, Wen Li, Cheng Yan, Haichao Huang, Qungui Wang, Jun Lu, Weiqing Yang
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Chemistry, Physical
Yihan Wang, Xiang Chu, Hongrui Zhang, Cheng Yan, Guo Tian, Weiqing Yang, Xiangrong Chen, Haitao Zhang
Summary: This study reports a hyper-conjugated effect in copolymerized polyaniline (PANI), which greatly improves electrical conductivity and specific capacitance. The findings pave the way for designing conjugated polymers with remarkable electronic and electrochemical properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Xiankan Zeng, Cheng Yan, Qungui Wang, Jingjing Cao, Xuehai Fu, Shiyu Yang, Yongjian Chen, Lunyao Pan, Wen Li, Weiqing Yang
Summary: By incorporating alkali metal salts, a high curvature PEDOT:PSS transport layer with self-assembly island-like structures is formed, improving the performance of CsPbBr3-based PeLEDs. The modified PeLEDs demonstrate a 2.1 times increase in peak external quantum efficiency (EQE) from 6.75% to 14.23% and a 3.3 times increase in half lifetime (T-50) from 3.96 to 13.01 h. Additionally, the PeLEDs exhibit a high luminance up to 44834 cd m(-2).
Article
Chemistry, Multidisciplinary
Chuanfeng Wang, Liang Lu, Zhu Liu, Yu Lai, Juan Li, Zhipei Xia, Jingjing Cao, Xuanlun Wang, Jun Lu, Weiqing Yang
Summary: This study reports the development of a soft, physically transient biogenic nanogenerator. The nanogenerator is made of degradable materials and exhibits both piezoelectric and photoluminescent properties. It shows high reliability and adaptability to external mechanical stimuli, making it a promising candidate for applications in tactile sensing and security.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Haitao Zhang, Aili Jia, Yuchen Wang, Xuehai Fu, Chongyu Liu, Hongzhi Peng, Hailong Tang, Zhong Xu, Junfeng Huang, Weiqing Yang
Summary: This study develops a strategy using perovskite CsPbI3 nanowires to enhance the poly(ethylene oxide) electrolyte in order to build a high-rate all-solid-state lithium-metal battery. The addition of CsPbI3 nanowires improves the ionic conductivity and suppresses lithium dendrite growth, leading to enhanced cycling stability and rate capability of the battery.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Qijun Tong, Qing Wang, Haijian Li, Jie Li, Weiqing Yang
Summary: A continuous skeleton carbon (CSC) with high conductivity and excellent structural stability was constructed by introducing gel network-structured PVDF into a natural biomass apocynum precursor. The resulting CSC-based supercapacitor exhibited super-high power density, ultra-long life, and high energy density.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.