scholarly journals Phase transitions and chemical reactions of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine under high pressure and high temperature

RSC Advances ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 5825-5833 ◽  
Author(s):  
Dexiang Gao ◽  
Jin Huang ◽  
Xiaohuan Lin ◽  
Dongliang Yang ◽  
Yajie Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature ◽  
Crystal Structures ◽  
Chemical Reactions ◽  
Extreme Conditions

Phase transitions, crystal structures and chemical reactions of β-HMX under extreme conditions were described systematically.

Unprecedented metallic BiS phase from the binary Bi–S family revisited under extreme conditions of high pressure and high temperature

2020 ◽  
Vol 318 ◽  
pp. 113984
Author(s):  
Yanmei Ma ◽  
Ruihong Li ◽  
Yingying Wang ◽  
Fangfei Li ◽  
Guangtao Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Extreme Conditions

Mode-crystallography analysis of the crystal structures and the low- and high-temperature phase transitions in Na0.5K0.5NbO3

2015 ◽  
Vol 48 (2) ◽  
pp. 318-333 ◽  
Author(s):  
B. Orayech ◽  
A. Faik ◽  
G. A. López ◽  
O. Fabelo ◽  
J. M. Igartua
Keyword(s):  
Phase Transitions ◽  
High Temperature ◽  
Crystal Structures ◽  
Degrees Of Freedom ◽  
High Temperature Phase ◽  
Structure Evolution ◽  
Internal Space ◽  
Temperature Phase ◽  
Conventional Solid State Reaction ◽  
Space Group

Na0.5K0.5NbO3has been synthesized by the conventional solid-state reaction process. The crystal structures and phase transitions, at low and high temperature, determined from the Rietveld refinements of X-ray and neutron powder diffraction data are reported. The structure evolution of Na0.5K0.5NbO3in the temperature range from 2 to 875 K shows the presence of three phase transitions. The first one, at ∼135 K, is discontinuous from the rhombohedralR3c(No. 161) space group to the room-temperature orthorhombicAmm2 (No. 38) space group; the second is discontinuous from the orthorhombic to the tetragonalP4mmspace group (No. 99) at ∼465 K, and the third is continuous from the tetragonal to the cubic Pm\overline{3}m space group (No. 221) at ∼700 K. The obtained phase-transition sequence isR3c→Amm2 →P4mm→Pm\overline{3}m. No previous studies at low temperature have been carried out on the material with composition Na0.5K0.5NbO3. In the course of the determination of the three experimentally found phases, a novel method of refinement is presented. This is a step forward in the use of the symmetry-adapted modes as degrees of freedom in the refinement process: the parameterization of a direction in the internal space of the, in this case, sole irreducible representation, GM4−, responsible for the symmetry breaking from the parent cubic space group to the polar distorted low-symmetry phases. Eventually, this procedure enables the calculation of the spontaneous polarization.

Dimorphic ErAgSn and TmAgSn – High-Pressure and High-Temperature Driven Phase Transitions

2007 ◽  
Vol 633 (10) ◽  
pp. 1551-1555 ◽  
Author(s):  
C. Peter Sebastian ◽  
Gunter Heymann ◽  
Birgit Heying ◽  
Ute Ch. Rodewald ◽  
Hubert Huppertz ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature

PREPARATION OF C60 BY DETONATION A MIXTURE OF TRINITROTOLUENE AND GRAPHITE

2012 ◽  
Vol 27 (01) ◽  
pp. 1350004
Author(s):  
XIANFENG WEI ◽  
YONG HAN ◽  
LIU LIU ◽  
XINPING LONG
Keyword(s):  
High Pressure ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Temperature ◽  
High Performance ◽  
Extreme Conditions ◽  
Detonation Pressure ◽  
Detonation Synthesis ◽  
Mass Ratio ◽  
Detonation Products

To explore the practicability of C 60 synthesis under extreme conditions (high pressure and high temperature), trinitrotoluene (TNT), trinitramine (RDX) and graphite mixtures of different proportions were detonated in a vacuum container, and the detonation products were collected for detecting. The results of mass spectroscopy, high performance liquid chromatography showed significant signals of C 60, which proved that C 60 could be synthesized by detonating the mixture of TNT and graphite (in 6:4 and 7:3 mass ratio, respectively), the detonation pressure and temperature were calculated around 13 GPa and 2000 K, respectively. Both experiment results and theoretical analysis showed the importance of detonation pressure and cooling temperature in detonation synthesis of C 60.

scholarly journals (Bio)chemical reactions during high pressure/high temperature processing affect safety and quality of plant-based foods

2012 ◽  
Vol 23 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Iesel Van der Plancken ◽  
Lise Verbeyst ◽  
Kristel De Vleeschouwer ◽  
Tara Grauwet ◽  
Raija-Liisa Heiniö ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Chemical Reactions ◽  
High Pressure High Temperature ◽  
High Temperature Processing

Phase transitions of Zn(OH)2 under high pressure and high temperature

2008 ◽  
Vol 148 (9-10) ◽  
pp. 382-385 ◽  
Author(s):  
Keiji Kusaba ◽  
Takumi Kikegawa
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature
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