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Local structural investigation of non-crystalline materials at high pressure: the case of GeOglass.
J Phys Condens Matter
February 2023
Center for High Pressure Science and Technology Advanced Research, Beijing 100193, People's Republic of China.
Local structures play a crucial role in the structural polyamorphism and novel electronic properties of amorphous materials, but their accurate measurement at high pressure remains a formidable challenge. In this article, we use the local structure of network-forming GeOglass as an example, to present our recent approaches and advances in high-energy x-ray diffraction, high-pressure x-ray absorption fine structure, andfirst-principles density functional theory calculations and simulations. Although GeOglass is one of the best studied materials in the field of high pressure research due to its importance in glass theory and geophysical significance, there are still some long-standing puzzles, such as the existence of appreciable distinct fivefoldGe coordination at low pressure and the sixfold-plusGe coordination at ultrahigh pressure.
View Article and Find Full Text PDFPressure-induced evolution in the durability of nickel-metal hydride batteries under high-current charge.
Phys Chem Chem Phys
June 2022
Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University 1-3 Machikaneyama, Toyonaka, 560-8531 Osaka, Japan.
We found that an AAA-type battery (min. 750 mAh) pressurized with Ar or N at pressures of up to 5 MPa exhibited a significant durability enhancement even under high-current conditions. As an example of a charge-discharge cycle test at 3 amperes, the residual ratio of capacity at atmospheric pressure decreased to approximately 90% of the standard capacity before 50 cycles.
View Article and Find Full Text PDFVenture into Water's No Man's Land: Structural Transformations of Solid H_{2}O under Rapid Compression and Decompression.
Phys Rev Lett
November 2018
Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China.
Pressure-induced formation of amorphous ices and the low-density amorphous (LDA) to high-density amorphous (HDA) transition have been believed to occur kinetically below a crossover temperature (T_{c}) above which thermodynamically driven crystalline-crystalline (e.g., ice I_{h}-to-II) transitions and crystallization of HDA and LDA are dominant.
View Article and Find Full Text PDFIsotactic poly(4-methyl-1-pentene) melt as a porous liquid: Reduction of compressibility due to penetration of pressure medium.
J Chem Phys
May 2017
Department of Chemistry, Kyushu University, Fukuoka 819-0395, Japan.
A pressure-induced structural change of a polymer isotactic poly(4-methyl-1-pentene) (P4MP1) in the melted state at 270 °C has been investigated by high-pressure in situ x-ray diffraction, where high pressures up to 1.8 kbar were applied using helium gas. The first sharp diffraction peak (FSDP) position of the melt shows a less pressure dependence than that of the normal compression using a solid pressure transmitting medium.
View Article and Find Full Text PDFA reconstructive polyamorphous transition in borosilicate glass induced by irreversible compaction.
J Chem Phys
February 2014
Otto Schott Institute, University of Jena, 07743 Jena, Germany.
Understanding the response of glasses to high pressure is of key importance for clarifying energy-dissipation and the origin of material damage during mechanical load. In the absence of shear bands or motile dislocations, pressure-induced deformation is governed by elastic and inelastic structural changes which lead to compaction of the glass network. Here, we report on a pressure-induced reconstructive amorphous-amorphous transition which was detected in sodium borosilicate glass by Raman and Brillouin scattering.
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