Article
Physics, Applied
Sevil Sarikurt, Yusuf Zuntu Abdullahi, Engin Durgun, Fatih Ersan
Summary: This study investigates the thermal expansion coefficients of group III-Nitride monolayers with temperature, revealing high negative values below room temperature and a convergence to zero for certain monolayers above room temperature. The highest contribution to negative thermal expansion comes from the ZA phonon mode. These findings are important for the design of nanoscale heat devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Geochemistry & Geophysics
Lin Liang, Xinjian Bao, Wen Liang, Haipeng Song, Xiang Wu, Shan Qin
Summary: This study investigated the in-situ X-ray diffraction (XRD) and Raman spectra of synthetic (Mg, Fe, Mn)CO3 single crystals. The lattice parameters and volumetric thermal expansion coefficients were obtained, indicating an inherent anisotropy of c/a near to 3.0. The Raman spectra showed a negative temperature dependence similar to the end members. The average thermodynamic Gruneisen parameters for different compositions of (Mg, Fe, Mn)CO3 carbonates were determined.
Article
Multidisciplinary Sciences
Andreas Zerr, Gerhard Miehe
Summary: This article reports on the synthesis of spinel structure tin(IV) nitride, gamma-Sn3N4, through laser heating diamond anvil cell at high pressures and temperatures, and the refinement of the product structure using Rietveld method. The study shows that this method is the most reliable way to obtain high-purity nitrides that are thermodynamically stable at high pressures. Raman spectroscopy and powder X-ray diffraction were used for characterization of the synthesized products. The pressure dependence of Raman band frequencies of gamma-Sn3N4 were measured, and its average mode Gruneisen parameter was determined to be 0.95. By using this value, the thermal-shock resistance of gamma-Sn3N4 was estimated to be about half of that of gamma-Si3N4.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Spectroscopy
Xin Hu, Kuan Zhai, Muhua Jia, Yungui Liu, Xiang Wu, Wen Wen, Weihong Xue, Shuangmeng Zhai
Summary: In this study, in-situ synchrotron X-ray diffraction and Raman spectroscopy were used to investigate the stabilities, thermal expansion, and vibrational modes of synthetic Mg-3(PO4)(2). The results revealed an irreversible phase transition in Mg-3(PO4)(2)-II and Mg-3(PO4)(2)-III, while Mg-3(PO4)(2)-I remained stable. The volumetric thermal expansion coefficients and Raman vibrations of the different polymorphs were analyzed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
Rachel E. Lim, Darren C. Pagan, Donald E. Boyce, Joel Bernier, Paul A. Shade, Anthony D. Rollett
Summary: This study utilized high energy x-ray diffraction microscopy to investigate the anisotropic coefficients of thermal expansion for Ti-7Al alloy. It was found that grain-level internal stresses are affected by crystal structure changes and the dissolution of precipitates.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Zhichao Song, Jun Zhang, Yan Wang, Jianping Li
Summary: SnO2 nanomaterials and SnO2/Li2SnO3 composite nanomaterials doped with different Li contents were synthesized via a one-step thermal evaporation method. The increase of Li doping resulted in changes in the structure and properties, as observed in X-ray diffraction, Raman scattering, and X-ray photoelectron spectroscopy.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Andre Ebel, Olivier Marsan, Jacques Lacaze, Benoit Malard
Summary: During rapid thermal cycling in automotive exhaust manifolds, a high-silicon cast iron was tested at 800 degrees C, leading to the formation of a columnar zone at the substrate/oxide interface. Detailed analysis proposed a mechanism for the formation of this unique structure.
Article
Materials Science, Ceramics
Daneshwaran Balaji, Sathasivam Pratheep Kumar
Summary: Incorporating cesium into orthorhombic langbeinite phosphosilicate has been shown to be feasible, with low crystallinity and significant impact on thermal expansion.
CERAMICS INTERNATIONAL
(2021)
Article
Spectroscopy
Weihong Xue, Kuan Zhai, Hu Wang, Xiang Wu, Wen Wen, Shuangmeng Zhai
Summary: The Raman spectra and X-ray diffraction patterns of Mg2P2O7 polymorphs were investigated at different temperatures, revealing the temperature dependence of their Raman vibrations and force constant evolution. The study provides valuable data on the thermal properties of Mg2P2O7 polymorphs.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
M. Anitha, K. Sandeep Rao, Rajak Syed, S. Kesari, R. Rao, D. K. Singh, S. N. Achary, Vivekanand Kain
Summary: This manuscript presents the temperature evolution of crystal structure and vibrational properties of tetragonal GdVO4. The material exhibits anisotropic expansion with a larger coefficient of thermal expansion along the c-axis. The thermal expansion behavior is mainly influenced by the orientation and expansion of Gd-O bonds in the structure. The Raman spectroscopic investigations reveal a decreasing trend in all observed phonon mode frequencies and the low energy modes contribute significantly to the expansion of GdVO4.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Geochemistry & Geophysics
Mario Tribaudino, Guy L. Hovis, Christine Almer, Amanda Leaman
Summary: We investigated the thermal expansion of 15 naturally occurring chemically diverse amphiboles using high-temperature X-ray powder diffraction. Our findings show that orthorhombic amphibole end-members expand more than monoclinic ones, and increased aluminum in the chemical composition leads to decreased expansion. The thermal expansion coefficients of amphiboles and pyroxenes are similar, but the expansion patterns differ.
AMERICAN MINERALOGIST
(2022)
Article
Physics, Condensed Matter
Rafael M. Digilov
Summary: The new equation for the temperature dependence of the thermal expansion of solids, presented in terms of the Lambert function, is suitable for a wide class of solids in the entire temperature range and provides linear correlation between thermal expansivity and specific heat according to Gruneisen's law at low temperatures. At intermediate temperatures, the equation simplifies to Gruneisen expressions, and it predicts a sharp increase in expansivity at high temperatures in accordance with experiments.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Physical
Zhao Wang, Cai Cheng, Heng-Xi Zhou, Ke Liu, Xiao-Lin Zhou
Summary: This study investigates the electronic, phonon, elastic, and thermal properties of two-dimensional square-octagon MoS2 (so-MoS2) using first-principles calculations and theoretical analysis. The results show that so-MoS2 has good flexibility, maintains elastic isotropy under twisting and straining, and exhibits promising thermodynamic properties. The study expands the potential for topological material systems.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Elizabeth Sobalvarro Converse, Fox Thorpe, Jesus Rivera, Harry Charalambous, Gabriella King, James T. Cahill, Wyatt L. Du Frane, Joshua D. Kuntz, Scott J. McCormack
Summary: There is a growing interest in studying ultra-high temperature ceramics due to their high melting points, which make them suitable for extreme environment applications. In-situ high temperature X-ray diffraction experiments were conducted on TiB2 beads up to 3050 degrees C. The coefficients of thermal expansion of TiB2 were characterized as a function of temperature, providing crucial information for the development of TiB2 ceramics and other transition metal diborides for high temperature applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Toshihiro Isobe, Yuri Adachi, Sachiko Matsushita, Akira Nakajima
Summary: This paper investigates the effect of Ti substitution on the thermal expansion behavior of Zr2-xTixS0.9P2O12-δ, finding that Ti has two effects: reduction of the lattice constant and inhibition of the phase transition. Ti showed a solid solubility limit of approximately x=0.7 in Zr2-xTixS0.9P2O12-δ, leading to two types of compounds with different thermal expansion behaviors.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Analytical
Elena Naumovska, Gabriel Kofi Nzulu, Laura Mazzei, Arnaud Le Febvrier, Kristina Komander, Martin Magnuson, Max Wolff, Per Eklund, Maths Karlsson
Summary: Results from an infrared spectroscopy study on hydrated nanocrystalline films of BaZr1-xScxO3-x/2 with different Sc concentrations show variations in the O-H stretching bands, indicating different proton configurations. Higher Sc concentrations exhibit a distinct O-H stretching band, while lower Sc concentrations show a broader, weaker band.
VIBRATIONAL SPECTROSCOPY
(2024)