Article
Physics, Applied
Ying Wang, Tu Lai Sun, Xiao Li Zhu, Lu Liu, Xiang Ming Chen
Summary: In this study, the effects of B-site Ta5+ substitution on Sr2Na(Nb1-xTax)(5)O-15 tungsten bronzes were investigated, revealing weakened ferroelectricity and a change in crystal structure with increasing Ta content. Raman spectra showed different bonding mechanisms resulting in reduced covalence and weakened polarization. Electron diffraction patterns suggested the possible ordering of B-site cations, which dominate the crossover from ferroelectric to relaxor behaviors in the compounds.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sunil K. Karna, C. W. Wang, R. Sankar, D. Temple, M. Avdeev
Summary: The magnetic structure of Li2Co(WO4)(2) was investigated using magnetic susceptibility and neutron diffraction measurements. Two magnetic transitions were observed at T-N1 around 9.5 K and T-N2 around 7.2 K. The neutron diffraction showed an incommensurate magnetic order between T-N1 and T-N2, and a commensurate magnetic order below T-N2.
Article
Physics, Fluids & Plasmas
P. Kong, Peng Wang, Liang Zhou, Ran Li
Summary: The evolution of structural defects during phase transition plays a significant role in understanding the mechanism of solid-liquid transition. However, current research on topological defects lacks an accurate method to quantify the local changes of structural defects. This paper proposes the use of local volume fraction as a key parameter to accurately quantify the variation of structural defects. The experimental results show that the evolution of structural defects in the particle system is caused by the decrease of local volume fraction, and the critical value of phase transition can be determined by the minimum local volume fraction phi(min). Furthermore, the evolution law of structural defects suggests that the phase transition is continuous, consistent with Kosterlitz-Thouless-Halperin-Nelson-Young theory. Therefore, the quantitative analysis of structural defects using local volume fraction can provide a clearer understanding of the mechanism of solid-liquid phase transition.
Article
Chemistry, Multidisciplinary
Yueyue He, Soeren L. Dreyer, Yin-Ying Ting, Yuan Ma, Yang Hu, Damian Goonetilleke, Yushu Tang, Thomas Diemant, Bei Zhou, Piotr M. Kowalski, Maximilian Fichtner, Horst Hahn, Jasmin Aghassi-Hagmann, Torsten Brezesinski, Ben Breitung, Yanjiao Ma
Summary: The high-entropy approach is applied to address the issue of unfavorable multilevel phase transitions in Na-ion cathodes, leading to poor stability and capacity decay. By synthesizing Mn-based samples with multiple metal species, a superior cathode material for Na-ion batteries, exhibiting high cyclability, is discovered. Computational comparisons and characterization techniques provide insights into the benefits of high-entropy structure, such as suppression of phase transitions and mitigation of gas evolution, during battery operation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Multidisciplinary
Xiangpeng Luo, Dimuthu Obeysekera, Choongjae Won, Suk Hyun Sung, Noah Schnitzer, Robert Hovden, Sang-Wook Cheong, Junjie Yang, Kai Sun, Liuyan Zhao
Summary: Using EQ RA-SHG, we demonstrate the ferro-rotational nature of CCDW in 1T-TaS2 and observe a photoinduced transient CDW phase at high pump fluence.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
L. V. Udod, S. S. Aplesnin, M. N. Sitnikov, E. V. Eremin, M. S. Molokeev, A. V. Shabanov, O. B. Romanova, A. M. Kharkov
Summary: A Bi2Fe4O9/BiFeO3 composite with a ratio of 67/33 has been synthesized and characterized. The average crystallite sizes for each phase were determined, and the magnetization hysteresis and disappearance temperature were established. The magnetic phase transitions of each phase were determined using infrared absorption spectra, and the correlation between the composite's structure and magnetic properties was studied.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Eric Quarez, Julio Cesar Espinosa-Angeles, Olivier Crosnier, Olivier Joubert, Thierry Brousse
Summary: Iron tungstate is a promising material for energy storage devices, with its high temperature form exhibiting an incommensurately modulated crystal structure. The broadening of diffraction lines in powder patterns suggests small ordered domains within the structure. These findings can aid in understanding the reported physical and electrochemical properties.
Article
Chemistry, Physical
Galo Jaime Paez Fajardo, Sebastian A. Howard, Egor Evlyukhin, Matthew J. Wahila, Wasim Raja Mondal, Mateusz Zuba, Jos E. Boschker, Hanjong Paik, Darrell G. Schlom, Jerzy T. Sadowski, Samuel A. Tenney, Benjamin Reinhart, Wei-Cheng Lee, Louis F. J. Piper
Summary: Studying the metal to insulator transition of NbO2 using temperature-dependent X-ray spectroscopy, it was found that dimerization leads to the insulating phase, while an oxygen rich surface reconstruction at the topmost layers remains unchanged regardless of temperature.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Gabriele Baglioni, Makars Siskins, Maurits Houmes, Martin Lee, Dong Hoon Shin, Samuel Manas-Valero, Eugenio M. Coronado, Yaroslav Blanter, Herre S. J. G. van der Zant, Peter Steeneken
Summary: Magnetostrictive coupling has become a sensitive method for studying magnetism in 2D materials by mechanical means. In this study, we optothermally modulate the magnetization in antiferromagnetic 2D material membranes to induce a high-frequency magnetostrictive driving force. The thermo-magnetostrictive effect near the critical temperature of magnetostrictive 2D materials provides a route for more efficient actuation of nano-magnetomechanical devices and studying the coupling among magnetic, mechanical, and thermodynamic degrees of freedom.
Article
Chemistry, Multidisciplinary
Hideki Hashimoto, Yuki Fujita, Koji Yazawa, Hidetaka Asoh
Summary: Porous-type anodic amorphous alumina is an important functional material with heat-induced local structural variations. The incorporation of different anions (phosphate, oxalate, sulfate) in amorphous alumina resulted in distinctive changes in the average coordination number. The findings contribute to the understanding of physical and chemical property changes and structural features of intermediate oxides that cannot form glass.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
D. Kartoon, G. Makov
Summary: Rubidium undergoes a liquid-liquid transition with a change in electronic band structure affecting the structural phase transition.
Article
Chemistry, Inorganic & Nuclear
Hu Cheng, Yixuan Xu, Xuefeng Zhou, Yu Gong, Dongliang Yang, Xiaodong Li, Yanchun Li
Summary: Over the past decade, external pressure has been found to play a crucial role in modulating the structures and properties of sesqui-chalcogenides. This research investigates pressure-induced structural phase transitions, alloying, and topological superconductivity in two ternary tetradymites, Bi2Te2Se and Bi2Se2Te. The study reveals novel structural transitions under pressure and the occurrence of superconductivity in one of the compounds.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Changhui Liu, Jiahao Zhang, Jian Liu, Zengyi Tan, Yuqi Cao, Xia Li, Zhonghao Rao
Summary: A hybrid polymer containing siloxyl functional groups was synthesized and used to encapsulate phase change materials (PCMs) under mild hypercrosslinking conditions. The presence of this polymer allowed for high encapsulation rates and thermal conductivity enhancement, along with a unique self-cleaning property in the composite material. Excitingly, a 600% increase in thermal conductivity and 93.7% light-to-thermal conversion efficiency were achieved without leakage, demonstrating the potential of this novel PCM encapsulation protocol.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Physics, Multidisciplinary
G. G. Guzman-Verri, C. H. Liang
Summary: We used the self-consistent phonon approximation to investigate the effects of flexoelectric interaction on ferroelectric materials and found that long-range modulated order is unstable at all temperatures. This study has important implications for nearly ferroelectric materials such as SrTiO3 and KTaO3, and suggests that these materials may be melted versions of an underlying modulated state dominated by nonzero momentum thermal fluctuations.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Matilde Saura-Muzquiz, Maxim Avdeev, Helen E. A. Brand, Brendan J. Kennedy
Summary: The structures and magnetic properties of Os4+ (5d4) halides are described, and the crystal structures and thermal stability of different compounds are studied. The experimental results show that these compounds exhibit unique magnetic behavior with a weak magnetic ground state.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Qin Chen, Haidong Jiang, Yipeng Fan, Zhou Li, Huang Ye, Yunpeng Yao, Shuang Chen, Chengmin Ji, Shuhua Zhang, Junhua Luo
Summary: A new strategy for designing high-T-c bismuth-halide ferroelectrics is proposed by modulating the steric confinement in a cuplike cavity, resulting in a significant increase in the Curie temperature up to 377 K.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shihai You, Tingting Zhu, Yumin Wang, Zeng-Kui Zhu, Zhongyuan Li, Jianbo Wu, Panpan Yu, Lina Li, Chengmin Ji, Yaxing Wang, Shuao Wang, Junhua Luo
Summary: This study reports a brand-new 3D lead chloride hybrid with a dense structure and broad white light emission. The structure shows effective X-ray scintillation and superior environmental and radiation stability. This research expands the family of 3D lead chloride hybrids and inspires the development of their optoelectronic applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yu Ma, Wuqian Guo, Qingshun Fan, Haojie Xu, Liwei Tang, Yi Liu, Wenjing Li, Xitao Liu, Junhua Luo, Zhihua Sun
Summary: This study presents the first demonstration of an inch-sized single crystal of a non-artificial layered heterostructure, which serves as a polarization-sensitive candidate and enables shortwave polarized-light detection with ultrahigh responsivity and detectivity. This research affords a new platform to explore candidates toward high-performance optoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yanqiang Li, Weiqi Huang, Yang Zhou, Xianyu Song, Jieyu Zheng, Han Wang, Yipeng Song, Minjuan Li, Junhua Luo, Sangen Zhao
Summary: In this study, a new type of organic functional building block was identified and synthesized to create the first cyamelurate nonlinear optical crystal. The crystal exhibited excellent optical properties, including a wide band gap, large birefringence, and strong second-harmonic generation response. This work highlights the potential for developing new nonlinear optical crystals with superior functional building blocks.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Nuclear
Long He, Junhua Luo, Li Jiang
Summary: The cross-sections of several neutron reactions on bromine isotopes were measured at specific neutron energies using offline gamma-ray spectrometry and neutron activation. Monoenergetic neutrons were generated via a nuclear reaction and the reaction products were detected using a high-purity germanium detector. The obtained data can improve the accuracy of related databases and verify nuclear reaction models.
Article
Chemistry, Multidisciplinary
Lina Hua, Liwei Tang, Yi Liu, Shiguo Han, Haojie Xu, Wuqian Guo, Yu Ma, Xitao Liu, Junhua Luo, Zhihua Sun
Summary: This study demonstrates the bulk anomalous photovoltaic (BAPV) effect in a lead-free double perovskite by tailoring the structure through mixing aromatic and alkali cations. The results show that the above-bandgap photovoltage (V-OC) exhibits directional anisotropy and positive dependence on electrode spacing. This discovery enriches the family of environmentally green BAPV-active candidates and facilitates their new optoelectronic application.
Article
Materials Science, Multidisciplinary
Yu Peng, Xing Wang, Lina Li, Huang Ye, Shuang Yang, Hua Gui Yang, Junhua Luo, Yu Hou
Summary: Circularly polarized luminescence (CPL) has gained increasing attention due to its wide-ranging applications. This study reports moisture-resistant 1D hybrid perovskites with white-CPL, which exhibit excellent structural flexibility and optoelectronic properties. These materials hold great potential for multifunctional applications due to their moisture resistance.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ziyang Wang, Xinyuan Zhang, Jianbo Wu, Lishan Liang, Xinyi Niu, Qin Chen, Ruiqing Li, Junhua Luo
Summary: An effective strategy is reported to achieve high-performance polarization-sensitive UV photodetection by constructing a heterojunction with two isotropic materials MAPbCl(3) and Silicon (Si). The device exhibits a large polarization ratio of 2.9 at 377 nm under the self-driven mode, driven by the angle-dependent photovoltage effect.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Xin Mao, Zhongyi Wang, Fen Zhang, Hong Yin, Xin Xu, Junsheng Chen, Zhen Chen, Junhua Luo, Keli Han, Ruiling Zhang
Summary: In this paper, the synthesis and photophysical properties of high-quality Sb3+-doped 0D Rb2ScCl5(H2O) perovskite single crystals are reported. It is found that the emission quantum yield can be dramatically enhanced from less than 1% to about 53% via Sb3+ doping. Spectroscopic characterizations indicate that the photoluminescence enhancement is a result of the efficient energy transfer from Sb3+ to the emissive self-trapped excitons. Additionally, 0.2%Sb3+:Rb2ScCl5(H2O) single crystals exhibit potential application in direct X-ray detection with a high sensitivity of 58.5 mu C Gy-1 cm-2.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Lina Hua, Jiaqi Wang, Yi Liu, Wuqian Guo, Yu Ma, Haojie Xu, Shiguo Han, Junhua Luo, Zhihua Sun
Summary: The improper perovskite ferroelectric (IA)(2)(EA)(2)Pb3Cl10 with unusual dielectric bistability near 392 K is presented. It exhibits large pyroelectric figures-of-merit (FOMs) and covers a broad spectral range from ultraviolet to infrared-II.
Article
Chemistry, Multidisciplinary
Shihai You, Panpan Yu, Jianbo Wu, Zeng-Kui Zhu, Qianwen Guan, Lina Li, Chengmin Ji, Xitao Liu, Junhua Luo
Summary: Researchers reported a 2D bilayered lead iodide hybrid perovskite, (2IPA)(2)FAPb(2)I(7), by alloying iodine-substituted short-chain cations into the 3D FAPbI(3). This material exhibits exceptional performance in detecting broadband weak lights and X-rays, with high responsivities, significant detectivities, and ultralow detection limits. Its outstanding attributes make it a promising candidate for next-generation optoelectronic devices.
Article
Chemistry, Physical
Jianbo Wu, Shihai You, Panpan Yu, Qianwen Guan, Zeng-Kui Zhu, Zhou Li, Chang Qu, Haiqing Zhong, Lina Li, Junhua Luo
Summary: In this study, self-powered X-ray detection was successfully realized in a chiral-polar 2D lead-free halide double perovskite material, (R-MPA)(4)AgBiI8. The material displayed significant spontaneous electric polarization, resulting in a large polar photovoltage of 0.36 V, which facilitated the separation and transport of X-ray-generated carriers for self-powered detection. X-ray detectors based on high-quality single crystals of this material exhibited high sensitivity (46.3 mu CGy(-1) cm(-2)) and ultralow detection limit (85 nGy s(-1) at zero bias), outperforming current 2D lead-free halide double perovskite detectors. This work provides insights for the future design of green self-powered radiation detectors.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yi Liu, Wuqian Guo, Lina Hua, Xi Zeng, Tian Yang, Qingshun Fan, Yu Ma, Changhao Gao, Zhihua Sun, Junhua Luo
Summary: In this study, a strong anomalous photovoltaic (APV) effect was demonstrated in a 2D hybrid perovskite ferroelectric material, achieved by alloying mixed organic cations. The material exhibited a high level of polarization sensitivity, with a giant current ratio and an above-bandgap photovoltage exceeding its bandgap. This research sheds light on the exploration of APV-active ferroelectrics and inspires their future optoelectronic device applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Yaoguo Shen, Liang Ma, Guofa Dong, Hualiang Yu, Junhua Luo
Summary: Research on planar pi-conjugated groups is of interest in the exploration of optical materials with large birefringence, and the key is to control the orientation and spatial density of birefringence-active groups. Two metal-free UV birefringent crystals were synthesized using an aqueous solution evaporation technique, featuring a two-dimensional layered structure composed of pi-conjugated planar units with the same orientation. These compounds exhibit a large birefringence, exceeding that of most melamine-based materials and commercial birefringent materials. The arrangement of groups regulated by halogen atoms provides inspiration for the exploration of new birefringent materials with large optical anisotropy.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Multidisciplinary Sciences
Yanqiang Li, Qingchen Wu, Zheshuai Lin, Youchao Liu, Yang Zhou, Xin Chen, Minjuan Li, Maochun Hong, Junhua Luo, Sangen Zhao
Summary: This study successfully synthesized Cs3C6N9·H2O crystal with bi-functional optical responses and found that it exhibits excellent nonlinear optical and linear optical anisotropic responses, demonstrating its great potential as a bi-functional optical crystal.
FUNDAMENTAL RESEARCH
(2023)