High Pressure Reactions in the Systems Zn3As2—As and Cd3As2—As

1975 ◽  
Vol 30 (9-10) ◽  
pp. 688-695 ◽  
Author(s):  
J. B. Clark ◽  
Klaus-Jürgen Range
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Temperature Region ◽  
High Temperature Region ◽  
Orthorhombic Space Group ◽  
Decomposition Products ◽  
High Pressure And Temperature ◽  
Space Group ◽  
Group D

ZnAs2 and CdAs2 decompose at high pressure and temperature. The determined decomposition boundaries are presented. From synthesis experiments in the systems Cd3As2—As and Zn3As2—As, the decomposition products were found to be mixtures of CdAs + As and ZnAs + As. The high pressure phases CdAs and ZnAs are orthorhombic, space group D152h — Pbca, with αo = 5.993 A, bo = 7.819 A, co = 8.010 Å and αo = 5.679 A, bo = 7.277 A, co = 7.559 Å, respectively. Further phases are recovered from the high temperature region at high pressure.

scholarly journals Multianvil High-Pressure/High-Temperature Synthesis and Characterization of multiferroic HP-Co3TeO6

2021 ◽  
Author(s):  
Gunter Heymann ◽  
Elisabeth Selb ◽  
Toni Buttlar ◽  
Oliver Janka ◽  
Martina Tribus ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Type Structure ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Space Group ◽  
Crystal System ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

By high-pressure/high-temperature multianvil synthesis a new high-pressure (HP) phase of Co3TeO6 was obtained. The compound crystallizes in the acentric trigonal crystal system of the Ni3TeO6-type structure with space group R3...

Cation ordering in the double tungstate LiFe(WO4)2

2012 ◽  
Vol 68 (2) ◽  
pp. i7-i8 ◽  
Author(s):  
Marjorie Albino ◽  
Stanislav Pechev ◽  
Philippe Veber ◽  
Matias Velazquez ◽  
Michael Josse
Keyword(s):  
High Temperature ◽  
Cation Ordering ◽  
Monoclinic Space Group ◽  
High Temperature Solution ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Double Tungstate ◽  
Growth Method ◽  
Temperature Solution ◽  
Expected Values

Single crystals of lithium iron tungstate, LiFe(WO4)2, were obtained using a high-temperature solution growth method. The analysis was conducted using the monoclinic space groupC2/c, with β = 90.597 (2)°, givingR1 = 0.0177. The Li and Fe atoms lie on twofold axes. The structure can also be refined using the orthorhombic space groupCmcm, giving slightly higher residuals. The experimental value of β and the residuals mitigate in favour of the monoclinic description of the structure. Calculated bond-valence sums for the present results are closer to expected values than those obtained using the results of a previously reported analysis of this structure.

Dielectric Breakdown of Polyimide Film in High Temperature Region

1976 ◽  
Vol 15 (9) ◽  
pp. 1813-1814 ◽  
Author(s):  
Masayuki Nagao ◽  
Goro Sawa ◽  
Masahiko Fukui ◽  
Masayuki Ieda
Keyword(s):  
High Temperature ◽  
Temperature Region ◽  
Dielectric Breakdown ◽  
Polyimide Film ◽  
High Temperature Region

High-pressure / High-temperature Studies on the Stannides RENiSn (RE = Ce, Pr, Nd, Sm) and REPdSn (RE = La, Pr, Nd)

2008 ◽  
Vol 63 (6) ◽  
pp. 695-706 ◽  
Author(s):  
Jan F. Riecken ◽  
Gunter Heymann ◽  
Wilfried Hermes ◽  
Ute Ch. Rodewald ◽  
Rolf-Dieter Hoffmann ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Magnetic Moments ◽  
Structural Data ◽  
Normal Pressure ◽  
Space Group ◽  
Type Space ◽  
High Pressure Phase Transition ◽  
High Pressure High Temperature ◽  
Rare Earth Coordination

The normal-pressure (NP) orthorhombic TiNiSi-type (space group Pnma) stannides RENiSn (RE = Ce, Pr, Nd, Sm) and REPdSn (RE = La, Pr, Nd) were transformed into the corresponding hexagonal ZrNiAl-type (space group P6̄2m) high-pressure (HP) modifications under multianvil high-pressure (7.5 - 11.5 GPa) high-temperature (1100 - 1200 °C) conditions. The structures of NP-CeNiSn, HPPrNiSn, NP-NdNiSn, HP-LaPdSn, HP-PrPdSn, and HP-NdPdSn were refined from single crystal X-ray diffractometer data. Structural data for HP-SmNiSn were obtained from a Rietveld powder refinement. The high-pressure phase transition significantly changes the rare earth coordination, i. e. 4 RE + 6 Ni(Pd) + 6 Sn atoms for the NP-phases and 6 RE + 5 Ni(Pd) + 6 Sn atoms for the HPphases. Susceptibility measurements of HP-PrPdSn and HP-NdPdSn reveal paramagnetic behavior with experimental magnetic moments of 3.61(1) μB/Pr atom and 3.66(1) μB/Nd atom, respectively. Low-temperature susceptibility and specific heat data point to inhomogeneous magnetism and spinglass behavior, respectively.

scholarly journals Stability and electronic structure of hydrogen vacancies in ADP: hybrid DFT with vdW correction

RSC Advances ◽  
2018 ◽  
Vol 8 (13) ◽  
pp. 6931-6939 ◽  
Author(s):  
Tingting Sui ◽  
Yafei Lian ◽  
Mingxia Xu ◽  
Lisong Zhang ◽  
Yanlu Li ◽  
...  
Keyword(s):  
Electronic Structure ◽  
High Temperature ◽  
Dft Calculations ◽  
Temperature Region ◽  
High Temperature Region

Hybrid DFT calculations with vdW correction well explain the defect-induced conductivity break of ADP in the high-temperature region.

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