The Madelung constant and bonding angle as “sensors” of the high-pressure induced amorphization and first-order isostructural phase transition in Mg(OH)2 and Ca(OH)2

2021 ◽  
Vol 296 ◽  
pp. 121993
Author(s):  
Valeri S. Harutyunyan
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Madelung Constant ◽  
First Order ◽  
Isostructural Phase Transition

First-Order Isostructural Phase Transition Induced by High Pressure in Fe(IO3)3

2020 ◽  
Vol 124 (16) ◽  
pp. 8669-8679 ◽  
Author(s):  
Akun Liang ◽  
Saqib Rahman ◽  
Hajra Saqib ◽  
Placida Rodriguez-Hernandez ◽  
Alfonso Muñoz ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
First Order ◽  
Isostructural Phase Transition

scholarly journals Orpiment under compression: metavalent bonding at high pressure

2020 ◽  
Vol 22 (6) ◽  
pp. 3352-3369 ◽  
Author(s):  
Vanesa Paula Cuenca-Gotor ◽  
Juan Ángel Sans ◽  
Oscar Gomis ◽  
Andres Mujica ◽  
Silvana Radescu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Strong Change ◽  
Isostructural Phase Transition

Orpiment (α-As2S3) under compression reports a strong change in the coordination of As atoms at 25 GPa, which can be ascribed to an isostructural phase transition. These changes are consistent with the formation of metavalent bonds in orpiment.

Thermodynamical Behaviour of PdSe2 while Subjected Isothermally to High Pressure – Volumetric Level Analysis

2008 ◽  
Vol 273-276 ◽  
pp. 271-276
Author(s):  
Veneta Grigorova
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Entropy Generation ◽  
Structure Type ◽  
Temperature Level ◽  
First Order ◽  
Order Of Phase Transition ◽  
Temperature Levels ◽  
Level Analysis ◽  
Compression Temperature

We study thermodynamically the behaviour of PdSe2 while subjected to high pressure under isothermal conditions. The present paper discusses the volumetric-level calculations and results. Experiments under two certain temperature levels are performed: 20oC and 300oC. Calculations and analyses are done according to the method for thermodynamical analysis developed by us in [1]. We detected the order of phase transition from PdS2 structure type to pyrite one to be first order notwithstanding the temperature level. Values of transition pressure were found to be 12.24 GPa and 9.785 GPa at 20oC and 300oC, respectively. Adjusted entropy generation during compression was calculated aiming to study stability of treated compound. Influence of compression temperature level was analysed, as well as duration of pressure plateaux.

Isostructural Phase Transition in Bismuth Oxide Chloride Induced by Redistribution of Charge under High Pressure

2015 ◽  
Vol 119 (49) ◽  
pp. 27657-27665 ◽  
Author(s):  
Jinggeng Zhao ◽  
Lingling Xu ◽  
Yang Liu ◽  
Zhenhai Yu ◽  
Chunyu Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Bismuth Oxide ◽  
Isostructural Phase Transition

Publisher's Note: Experimental Evidence for a High-Pressure Isostructural Phase Transition in Osmium [Phys. Rev. Lett.93, 095502 (2004)]

2004 ◽  
Vol 93 (10) ◽  
Author(s):  
Florent Occelli ◽  
Daniel L. Farber ◽  
James Badro ◽  
Chantel M. Aracne ◽  
David M. Teter ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Experimental Evidence ◽  
Isostructural Phase Transition

scholarly journals Crystal structure of the high-P polymorph of Ca2B6O6(OH)10·2(H2O) (meyerhofferite)

2021 ◽  
Vol 77 (6) ◽  
Author(s):  
Davide Comboni ◽  
Tomasz Poreba ◽  
Francesco Pagliaro ◽  
Tommaso Battiston ◽  
Paolo Lotti ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
High Pressure ◽  
Large Volume ◽  
Atomic Scale ◽  
Deformation Mechanisms ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Structural Differences

The crystal structure of the high-pressure polymorph of meyerhofferite, ideally Ca2B6O6(OH)10·2(H2O), has been determined by means of single-crystal synchrotron X-ray diffraction data. Meyerhofferite undergoes a first-order isosymmetric phase transition to meyerhofferite-II, bracketed between 3.15 and 3.75 GPa, with a large volume discontinuity. The phase transition is marked by an increase in the coordination number of the boron B1 site, from III to IV, leading to a more interconnected and less compressible structure. The main structural differences between the two polymorphs and the P-induced deformation mechanisms at the atomic scale are discussed.

Structural phase transition of CeAuGe at high pressure

2005 ◽  
Vol 220 (2/3) ◽  
Author(s):  
Valeri Brouskov ◽  
Michael Hanfland ◽  
Rainer Pöttgen ◽  
Ulrich Schwarz
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Structural Phase ◽  
Lattice Parameter ◽  
First Order ◽  
First Order Phase Transition ◽  
Diamond Anvil ◽  
Ternary Intermetallic Compound ◽  
First Order Phase ◽  
Type Crystal

AbstractStructural properties of the ternary intermetallic compound CeAuGe were investigated at hydrostatic pressures up to 15 GPa with high-resolution angle dispersive X-ray powder diffraction using synchrotron radiation and the diamond anvil cell technique. At 8.7(7) GPa a first order phase transition is observed from a hexagonal NdPtSb-type arrangement into an orthorhombic high-pressure modification with a TiNiSi-type crystal structure. The transformation is associated with a 3% shortening of the lattice parameter perpendicular to the puckered layers [AuGe]

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