Article
Chemistry, Physical
Guan-Yu Chen, Chia-Hsiu Hsu, Bo-You Liu, Li-Wei Chang, Deng-Sung Lin, Feng-Chuan Chuang, Pin-Jui Hsu
Summary: The growth and quantum well electronic states of 2D Pb nanoislands on Nb-doped SrTiO3(001) were investigated using scanning tunneling microscopy and spectroscopy. Unlike other substrates, isolated Pb nanoislands with a height of 4 atomic layers were formed on the Nb-doped SrTiO3(001) surface as the building blocks for island growth. Energy-dependent scattering phase shift shows a metallic-like interface similar to Pb/Ag(1 1 1).
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Hua Zhou, Xiaxia Liao, Shanming Ke, Xin Liu, Jingdi Lu, Jinxing Zhang, Shujun Hu, Mingchun Xu, Lihui Bai, Shishen Yan
Summary: The growth temperature of Nb-STO film significantly affects the Nb-STO/ITO interface relationship, sheet resistance, and electron mobility.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Ceramics
Yoon Hyung Keum, Jong Yeog Son
Summary: We investigated the ferroelectric switching dynamics, as well as the multiferroic and piezoelectric properties of highly a-oriented epitaxial Bi5Ti3FeO15 (BTFO) thin films on Nb-doped SrTiO3 single crystal substrates. The highly a-oriented epitaxial BTFO thin films exhibited the best ferroelectric properties, while the highly c-oriented epitaxial BTFO thin films exhibited the best ferromagnetic properties. Particularly, the BTFO thin films with a proper mix of a- and c-oriented crystallinity showed the best piezoelectric properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Arindom Chatterjee, Zhenyun Lan, Dennis Valbjorn Christensen, Federico Bauitti, Alex Morata, Emigdio Chavez-Angel, Simone Sanna, Ivano E. Castelli, Yunzhong Chen, Albert Tarancon, Nini Pryds
Summary: The study focused on the fabrication of thermoelectric thin films doped with SrTiO3-based oxides, showing a decrease in electrical conductivity, carrier density, and thermoelectric Seebeck coefficient as the film thickness decreases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Applied
Qianqian Ma, Xin Wen, Lingtong Lv, Qian Deng, Shengping Shen
Summary: The enhanced flexoelectric-like effect in oxide semiconductors has properties comparable to high-K materials and has led to research aimed at enhancing the flexoelectricity of these materials. However, the effective flexoelectric coefficient approaches limits under different doping methods, indicating the need to address fundamental questions. In this study, the researchers revisited the origin of the flexoelectric-like effect in oxide semiconductors and found that the effective flexoelectric coefficient of Nb-doped SrTiO3 single crystals increases with a larger doping concentration of Nb. Additionally, the presence of oxygen vacancies has a crucial impact on flexoelectricity at low frequencies.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Zichen He, Minghe Cao, Eugene Furman, Michael T. Lanagan, Mengxue Yuan, Xiangyu Meng, Jinsong Wu, Hua Hao, Zhonghua Yao, Zhiyong Yu, Hanxing Liu
Summary: Anomalous dielectric relaxation is observed in Nb-doped SrTiO3 single crystal, with the relaxation rate slowing down as the temperature increases, which is related to the properties at the interfaces of PNRs. This anomalous relaxation is reminiscent of the positive temperature coefficient of resistance (PTCR) effect in polycrystalline materials.
CERAMICS INTERNATIONAL
(2022)
Article
Neurosciences
Thomas F. Tiotto, Anouk S. Goossens, Jelmer P. Borst, Tamalika Banerjee, Niels A. Taatgen
Summary: Researchers conducted measurements on interface-type memristors to validate their use in neuromorphic hardware, specifically utilizing Nb-doped SrTiO3 memristors as synapses in a simulated neural network. Through a novel supervised learning algorithm and noise injection to simulate real-world conditions, the memristors showed potential as synaptic weight elements, suggesting their suitability for future computing platforms.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Materials Science, Ceramics
N. Yalini Devi, K. Vijayakumar, P. Rajasekaran, A. S. Alagar Nedunchezhian, D. Sidharth, Shimomura Masaru, M. Arivanandhan, R. Jayavel
Summary: In this study, oxide thermoelectric materials were prepared with varying concentrations of Gd to achieve high crystalline cubic structured nanocomposites with different morphologies and electrical resistivity. The co-substituted samples showed higher Seebeck coefficient and power factor at high temperatures compared to the singly substituted samples.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Shuanghao Wu, Liuxue Xu, Kun Zhu, Baijie Song, Hao Yan, Bo Shen, Jiwei Zhai
Summary: The control of grain orientation and enhancement of piezoelectric and ferroelectric properties in thin films were achieved by introducing Nb-doped SrTiO3 single crystalline substrates. Consequently, Nb-doped SrTiO3 substrates facilitated the growth of oriented thin films with larger piezoelectric coefficient, energy storage density, and efficiency, promising broad application prospects.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
M. A. K. Yousaf Shah, Sajid Rauf, Bin Zhu, Naveed Mushtaq, Muhammad Yousaf, Peter D. Lund, Chen Xia, Muhammad Imran Asghar
Summary: A chemically stable perovskite semiconductor Nb-doped SrTiO3-delta (STN) electrolyte for SCFCs demonstrated high power density and open-circuit voltage at 520 degrees C. The high ionic conductivity was attributed to increased oxygen vacancies and band gap modulation, while band bending at the electrode/electrolyte interface helped prevent short circuits. Doping and energy band gap modulation were shown to be effective strategies for advanced semiconductor electrolyte development in SCFCs.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Ceramics
Lichen Luo, Jinglei Li, Mingwen Wang, Shuai Yang, Jie Wu, Xiangyu Gao, Chunchun Li, Wenya Du, Lin Zhang, Fei Li
Summary: In this study, Nb-doped SrTiO3 ceramics were prepared and found to exhibit high dielectric permittivity and low dielectric loss. XRD analysis indicated a high purity with no secondary phase. XPS experiments confirmed the influence of Nb doping on the high dielectric performance.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Lili Ding, Ye Ji, Xiaoyue Zhang, Mengjun Wu, Yue Zheng, Biao Wang, Weijin Chen
Summary: A new type of topological nanoisland domain texture has been discovered, with unique transport characteristics and rectifying behavior. These nanoislands exhibit exotic quad-domain textures, which show a higher conductance in the quad-domains compared to the cross-shaped buffer domains, indicating a correlation between local conductance and domain textures. This research sheds light on the potential applications of these domain textures in configurable electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
N. Ishikawa, Y. Fujimura, K. Kondo, G. L. Szabo, R. A. Wilhelm, H. Ogawa, T. Taguchi
Summary: In this study, the formation of irradiation-induced hillock chains in a doped SrTiO3 crystal was examined using atomic force microscopy and scanning electron microscopy. It was found that the formation of multiple hillocks is accompanied by the presence of continuous ion tracks. Cross-sectional transmission electron microscopy revealed that the size of ion tracks varies with depth, with larger tracks in the near-surface region and smaller tracks in the deeper region. The absence of recrystallization in the near-surface region was attributed to material transport towards the surface.
Article
Chemistry, Physical
Maocai Wei, Junhong Hao, Meifeng Liu, Lun Yang, Yunlong Xie, Xiuzhang Wang, Zijiong Li, Yuling Su, Zhongqiang Hu, Jun-Ming Liu
Summary: In this study, self-polarized Bi0.9Eu0.1FeO3 (BEFO)/Nb-doped SrTiO3 (NSTO) p-n heterojunctions with excellent photovoltaic effects were synthesized. Under illumination at 405 nm, the heterojunctions exhibited high short-circuit current, open-circuit voltage, and light intensity, as well as high light-on/off current ratio, responsivity, detectivity, and fast response speed. The devices demonstrated superior performance even at weak incident light intensity, surpassing previously reported self-powered photodetectors based on ferroelectric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Zichen He, Minghe Cao, Yong Tao, Xiangyu Meng, Jinsong Wu, Hua Hao, Zhonghua Yao, Zhiyong Yu, Hanxing Liu, Eugene Furman, Michael T. Lanagan
Summary: Nb-doped SrTiO3 single crystals exhibit giant permittivity and low dielectric loss, making them suitable for energy storage devices and modern microelectronics components. The mechanisms responsible for this behavior, including chemical compositional gradients and local fluctuations, have been studied. Optimizing the local structures and chemistries in dielectrics is an effective way to tailor their dielectric performance.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Baozhong Li, Kun Luo, Yanfeng Ge, Yang Zhang, Ke Tong, Bing Liu, Guochun Yang, Zhisheng Zhao, Bo Xu, Yongjun Tian
Summary: Finding a material with high hardness and toughness is a crucial research topic. This study introduces a new superior mechanical material called Gradia, composed of diamond and graphite nanodomains interlocked via coherent interfaces. Gradia exhibits sequential structural transitions under strain, leading to outstanding toughness. Furthermore, it has the potential to be a superhard material with estimated Vickers hardness exceeding 40 GPa. This work could be exemplary in exploring excellent mechanical materials through the modulation of carbon building block linking styles.
Article
Chemistry, Physical
Linyan Wang, Xudong Wei, Xiaokuan Hao, Xiaoxu Song, Guochun Yang, Cheng Lu, Yuanzheng Chen, Lin Wang, Guoying Gao, Yongjun Tian
Summary: We conducted an extensive study on different B-P stoichiometries under pressure using a particle swarm optimization method and first-principles calculations. BP and B6P were found to be thermodynamically stable at 1 atm, while other stoichiometries were metastable. Under pressure, BP and B6P remained stable up to 80 GPa, while other stoichiometries became unstable at lower pressures. We predicted a new Cmca B6P structure with the lowest energy and higher shear strain than the R (3) over barm structure. Additionally, we found that the predicted Pm B8P is a magnetic semiconductor with a magnetic moment of 1 mu(B). All these boron-rich phosphides are hard materials. These results enrich the B-P phase diagram and promote extensive research on their excellent properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Zihe Li, Yujia Wang, Mengdong Ma, Huachun Ma, Wentao Hu, Xiang Zhang, Zewen Zhuge, Shuangshuang Zhang, Kun Luo, Yufei Gao, Lei Sun, Alexander V. Soldatov, Yingju Wu, Bing Liu, Baozhong Li, Pan Ying, Yang Zhang, Bo Xu, Julong He, Dongli Yu, Zhongyuan Liu, Zhisheng Zhao, Yuanzheng Yue, Yongjun Tian, Xiaoyan Li
Summary: By controlling the transformation of amorphous carbon into diamond, researchers synthesized an in-situ composite consisting of ultrafine nanodiamond uniformly dispersed in disordered multilayer graphene with incoherent interfaces. This composite exhibits high hardness, high strength, and high electrical conductivity, surpassing traditional ceramics and C/C composites in comprehensive properties.
Article
Engineering, Electrical & Electronic
Ming Tang, Junwei Huang, Feng Qin, Kun Zhai, Toshiya Ideue, Zeya Li, Fanhao Meng, Anmin Nie, Linglu Wu, Xiangyu Bi, Caorong Zhang, Ling Zhou, Peng Chen, Caiyu Qiu, Peizhe Tang, Haijun Zhang, Xiangang Wan, Lin Wang, Zhongyuan Liu, Yongjun Tian, Yoshihiro Iwasa, Hongtao Yuan
Summary: Controlling the magnetic anisotropy of ferromagnetic materials is crucial for the development of magnetic switching devices and spintronic applications. This study demonstrates the gate-tunable modulation of magnetic anisotropy in the van der Waals ferromagnet Fe5GeTe2, allowing for continuous rotation of the magnetic easy axis from an out-of-plane to an in-plane orientation. The results show that the modulation of anisotropy can be achieved via a spin-flop pathway and the range of modulation is significant, from 2.11 to -0.38 MJ m(-3). Additionally, temperature can also be used to tune the anisotropy.
NATURE ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Binhao Wang, Haidong Zhao, Bin Zhang, Dan Wang, Aihua Song, Chen Chen, Fengrong Yu, Wentao Hu, Dongli Yu, Bo Xu, Yongjun Tian
Summary: The carrier concentration of n-type PbTe can be optimized by doping indium and aluminum, which leads to enhanced thermoelectric performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Jingpeng Hou, Keliang Qiu, Fengshi Li, Zhenyu Yang, Yonghai Yue, Yongjun Tian, Zhongchang Wang, Lin Guo
Summary: Twin boundary (TB) is a special and fundamental internal interface that alters the mechanical and physical properties of materials. The deformation mechanism of TB and its effect on material strength and plasticity are still under debate. This study discovered that the pseudoelastic strain of a TB can recover with decomposition and escape of pile-up dislocations, which opens up new possibilities for optimizing material properties by manipulating twin boundaries at the nanoscale.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xiao-Ji Weng, Jie Bai, Jingyu Hou, Yi Zhu, Li Wang, Penghui Li, Anmin Nie, Bo Xu, Xiang-Feng Zhou, Yongjun Tian
Summary: In this study, techniques such as scanning tunneling microscopy, X-ray photoelectron spectroscopy, angle-resolved photoemission spectroscopy, and aberration-corrected scanning transmission electron microscopy were used to validate the crystal structure of copper-rich boride Cu8B14 formed on the single crystal Cu (111) surface after depositing boron. First-principles calculations with defective surface models further showed that boron atoms tend to react with copper atoms near terrace edges or defects, resulting in the formation of intermediate structures and the eventual stable Cu-B monolayer through large-scale surface reconstruction.
Article
Physics, Applied
Yanfeng Ge, Kun Luo, Yong Liu, Guochun Yang, Pan Ying, Yingju Wu, Ke Tong, Bing Liu, Baozhong Li, Guoying Gao, Xiang-Feng Zhou, Zhisheng Zhao, Bo Xu, Yongjun Tian
Summary: The discovery of graphite-diamond hybrid materials (Gradia) has opened up a new direction in carbon allotropes research. In this study, Gradia-HZ, composed of interfaced graphite and hexagonal diamond parts, exhibited distinct electronic and mechanical properties. By modulating the graphite width, Gradia-HZ demonstrated unexpected topological nodal-line semimetal, semiconductor, and normal metal characteristics, along with a distinctive Quasi-1D electronic transport capability based on first-principles calculations. The discovery of unique physical properties in Gradia-HZ, such as high-conductivity metals, semiconductors with variable bandgap, and topological semimetals, will inspire further research and promote the development and application of graphite-diamond hybrid materials.
APPLIED PHYSICS REVIEWS
(2023)
Article
Materials Science, Ceramics
Chen Chen, Bin-Hao Wang, Hai-Dong Zhao, Bin Zhang, Dan Wang, Tao Shen, Peng-Hui Li, Song Zhao, Dong-Li Yu, Yong-Jun Tian, Bo Xu
Summary: In this study, SnSe bulks with a unique microstructure of tightly-bound quasi-equiaxed grains were prepared via a sequential procedure. The produced samples exhibited excellent mechanical properties, including high Vickers hardness, compressive strength, and bending strength. Furthermore, the microstructures did not negatively affect the thermoelectric performance. This work demonstrates an effective procedure to prepare microstructure-engineered SnSe materials and provides insights for enhancing the properties of other layer-structured thermoelectric materials.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Materials Science, Multidisciplinary
Penghui Li, Xiaokuan Hao, Shenglin Lu, Linyan Wang, Guoyu Xiong, Ke Tong, Yu Duan, Yeqiang Bu, Guoying Gao, Hongtao Wang, Bo Xu, Anmin Nie, Fei Tian
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Keliang Qiu, Jingpeng Hou, Shuai Chen, Xiang Li, Yonghai Yue, Bo Xu, Qi Hu, Limin Liu, Zhenyu Yang, Anmin Nie, Yufei Gao, Tianye Jin, Jing Wang, Yanhong Li, Yanbin Wang, Yongjun Tian, Lin Guo
Summary: The room-temperature self-healing behavior of a nanotwinned diamond composite is quantitatively evaluated and found to stem from both the formation of nanoscale diamond osteoblasts and the atomic interaction transition from repulsion to attraction.
Article
Materials Science, Multidisciplinary
Junquan Huang, Yujun Chen, Chong Wang, Penghui Li, Ke Tong, Mengke Kang, Tianye Jin, Wentao Hu, Junyun Chen, Mengdong Ma, Bo Xu, Anmin Nie, Yongjun Tian
Summary: A study was conducted to investigate the anisotropic performance of a thick 3C-SiC single crystal through in-situ nano-scratching. The crystal exhibited different hardness, material removal rate, and coefficient of friction when scratched along different directions. Plastic material removal was achieved through dislocation slip and lattice distortion. Perfect dislocation slip and intense strain caused polycrystallization, which was identified as a significant deformation mechanism in 3C-SiC.
SCIENCE CHINA-MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Binhao Wang, Haidong Zhao, Bin Zhang, Dan Wang, Aihua Song, Chen Chen, Fengrong Yu, Wentao Hu, Dongli Yu, Bo Xu, Yongjun Tian
Summary: The n-type indium and aluminum codoped PbTe material was prepared using high-pressure synthesis and spark plasma sintering. The Al doping provided a nearly constant carrier concentration with varying temperatures, while In doping trapped electrons at low temperatures and released them at high temperatures, thus optimizing the carrier concentration over a broad temperature range. As a result, both electrical transport properties and thermal conductivity were optimized, leading to a significantly enhanced thermoelectric performance in InxAl0.02Pb0.98Te. The optimal In0.008Al0.02Pb0.98Te showed a peak ZT of 1.3 and an average ZT of 1, with a decent conversion efficiency of 14%.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Letter
Chemistry, Physical
Linyan Wang, Xudong Wei, Xiaokuan Hao, Xiaoxu Song, Guochun Yang, Cheng Lu, Yuanzheng Chen, Lin Wang, Guoying Gao, Yongjun Tian
Summary: In this study, a comprehensive investigation on different B-P stoichiometries under pressure was conducted by combining a particle swarm optimization method with first-principles calculations. The research revealed that BP and B6P are thermodynamically stable at 1 atm, while others are metastable. Under pressure, BP and B6P remain stable up to 80 GPa, whereas other stoichiometries become unstable at lower pressures. New structures of B6P and B8P were predicted, showing higher shear strain and magnetic properties, respectively. These findings not only enrich the B-P phase diagram, but also promote further exploration of their exceptional properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
