Article
Physics, Multidisciplinary
Qunfei Zheng, Qiang Li, Saidong Xue, Yanhui Wu, Lijuan Wang, Qian Zhang, Xiaomei Qin, Xiangyong Zhao, Feifei Wang, Wenge Yang
Summary: Using in situ Raman spectroscopy, the pressure evolution of local structure and vibrational dynamics of the perovskite-type relaxor ferroelectric single crystal under pressure is systematically investigated. The results reveal two characteristic pressure points for phonon modes up to 30 GPa, corresponding to the rhombohedral-to-tetragonal phase transition and the structural transition involving oxygen octahedral tilt and vibration.
CHINESE PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jianwei Zhao, Stephen D. Funni, Emily R. Molina, Elizabeth C. Dickey, Jacob L. Jones
Summary: Under the application of an external voltage, high electric field concentrations develop around the interdigitated electrode edges inside multilayer ceramic actuators (MLCAs). The local inhomogeneity in the electromechanical response is caused by the spatial distribution of the local electrical field. By utilizing synchrotron-based high-energy X-ray diffraction (XRD), the structural changes in partially electroded Nb-doped PbZrxTi1-xO3 samples as a function of applied electric field were investigated. The results show that the domain switching behavior and phase transitions are spatially dependent across the inactive regions in partially electroded samples, especially near the electrode edge and the tetragonal composition near the morphotropic phase boundary (MPB).
Article
Chemistry, Physical
Burak Guzelturk, Thomas Winkler, Tim W. J. Van de Goor, Matthew D. Smith, Sean A. Bourelle, Sascha Feldmann, Mariano Trigo, Samuel W. Teitelbaum, Hans-Georg Steinruck, Gilberto A. de la Pena, Roberto Alonso-Mori, Diling Zhu, Takahiro Sato, Hemamala Karunadasa, Michael F. Toney, Felix Deschler, Aaron M. Lindenberg
Summary: Diffuse X-ray scattering with femtosecond resolution reveals the formation and relaxation of polaronic distortions in halide perovskites. These structural changes are quantified and correlated to transient changes in carrier effective mass.
Article
Materials Science, Multidisciplinary
A. Singha, S. Praharaj, S. K. Rout, R. Verma, D. Rout
Summary: This study investigates the ferroelectric and dielectric behavior in lead-free ceramic, speculating the emergence of a relaxor phase due to the evolution of highly polarizable dipolar entities of different symmetries. The temperature and frequency-insensitive dielectric behavior observed in the ceramic may be correlated to the gradual crossover of polar nano regions.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Physical
Viliam Hakala, Dimitra K. Manousou, Konstantin Glazyrin, Wilson A. Crichton, Karen Friese, Andrzej Grzechnik
Summary: A simple method for growing single crystals of alpha-V2O5 is presented and discussed in this research. It is found that alpha-V2O5 irreversibly amorphizes above a certain pressure, while the crystal structure of alpha-V6O13 remains stable up to at least 9.4 GPa.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Meena Said, Amy E. Hixon
Summary: Characterization of plutonium dioxide (PuO2) and thorium dioxide (ThO2) aging under different temperature and relative humidity conditions revealed significant stability differences between actinide oxides, providing important insights for nuclear forensic applications and fundamental safety and storage concerns. The study used a variety of techniques, including scanning electron microscopy and X-ray diffraction, to analyze the morphological and phase changes in the materials, highlighting the need for further research on the chemical and physical properties of actinide compounds near ambient temperatures and humidities.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Letter
Chemistry, Physical
Alexei A. Belik
Summary: The aim of these comments is to draw attention to significant errors reported in the commented paper, in which the authors claimed the preparation of solid solutions Bi1-xHoxFeO3. However, the X-ray diffraction data revealed the absence of single-phase solid solutions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Ryota Yabune, Shunya Shimizu, Masaharu Fujioka, Hideaki Sasaki
Summary: The effects of Ag on the phase transformation of Cu3Sb were investigated. It was found that Ag dissolved in the Cu3Sb phase, enhancing its stability. A new alloy phase with a hexagonal structure was also observed. The isothermal section of the Cu-Sb-Ag ternary phase diagram at 500 degrees C was successfully constructed based on observations of alloys with various compositions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Chemistry, Physical
Sanyukta Ghosh, Umasankar Rout, Krushna Kumari Raut, Anirudha Karati, Gerda Rogl, Peter Franz Rogl, Ernst Bauer, B. S. Murty, Ramesh Chandra Mallik
Summary: Filling the voids of a skutterudite material with suitable electropositive elements can greatly affect the power factor by altering carrier concentration. Doping and filling can further enhance the thermoelectric properties. Electropositive n-type fillers have been successfully used in Co4Sb12. In this study, Fe was substituted as a p-type dopant in S0.15Co4Sb12, resulting in the highest zT value.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Multidisciplinary Sciences
Danae N. Polsin, Amy Lazicki, Xuchen Gong, Stephen J. Burns, Federica Coppari, Linda E. Hansen, Brian J. Henderson, Margaret F. Huff, Malcolm McMahon, Marius Millot, Reetam Paul, Raymond F. Smith, Jon H. Eggert, Gilbert W. Collins, J. Ryan Rygg
Summary: This study investigates the effects of extreme pressure on sodium and reveals the occurrence of temperature-driven polymorphism and the formation of an electride phase.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Xingxing Wu, Shouyu Wang, Winnie Wong-Ng, Qiang Gu, Yao Jiang, Chao Wang, Shuang Ma, Weifang Liu
Summary: Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Ti19Ru0.1O7 ceramics were successfully synthesized using the conventional solid-state reaction method. The Ru substitution led to changes in the crystal structure, decreased coercive field, and a lower optical bandgap due to impurity energy levels, as supported by first-principles calculations. The unexpected induced magnetic moments in Ru-doped Ca3Ti2O7 are also discussed.
JOURNAL OF ADVANCED CERAMICS
(2021)
Article
Materials Science, Multidisciplinary
Ajay Kumar Kalyani
Summary: This study reports a non-classical approach to obtain morphotmpic phase boundaries (MPB) in piezoelectric materials by choosing end members with similar polar symmetry, leading to an enhanced piezoelectric response.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Olga S. Volkova, Peter S. Berdonosov, Irina K. Shamova, Badiur Rahaman, Asif Iqbal, Tanusri Saha-Dasgupta, Alexander N. Vasiliev
Summary: Monoclinic Cu4O(SeO3)3 was prepared using hydrothermal method and subsequent heating in evacuated silica tubes. The compound exhibits magnetic ordering at T1 = 13.2 K and a pre-transitional anomaly at T2 = 17.2 K. The application of external magnetic field suppresses excessive magnetization of the intermediate phase, but a hump in specific heat is observed. First principles calculations provide values of both ferro-magnetic and antiferromagnetic exchange interactions within O2Cu6 units, as well as anti-ferromagnetic intralayer and interlayer exchange interactions. A magnetic model for monoclinic Cu4O(SeO3)3 is proposed based on the signs and values of these interactions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jiaming Li, Enwei Sun, Yaping Ma, Huashan Zheng, Hua Zhao, Zhiguo Zhang
Summary: This study proposes a method to quantitatively characterize the phase transition processes of ferroelectric materials using fluorescence wavelength shift, demonstrating exact consistency between changes in fluorescence peak positions and structural phase transitions. The contactless, non-destructive fluorescence method provides localized quantitative analysis for phase transition processes in ferroelectric materials. The method based on fluorescence peak wavelength dependence on crystal environment may potentially be applied to characterize phase transitions in other ferroelectric materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Aldo Raeliarijaona, R. E. Cohen
Summary: This study clarifies the nature of hafnia as a proper ferroelectric material and reveals a shallow double well involving a single soft polar mode. Various important hafnia structures derived from the cubic fluorite structure are examined using symmetry analysis, density functional theory, and density functional perturbation theory. The Pca21 structure is considered the most likely ferroelectric phase observed experimentally.
