scholarly journals High-pressure High-temperature Synthesis, Magnetic Properties and X-ray Absorption Spectroscopy of Phases RE3Sn7 and hp-RESn3-x (RE = Tb, Ho, Er) 

2010 ◽  
Vol 636 (9-10) ◽  
pp. 1695-1702 ◽  
Author(s):  
Katrin Meier ◽  
Leonid Vasylechko ◽  
Raul Cardoso-Gil ◽  
Ulrich Burkhardt ◽  
Walter Schnelle ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
High Temperature ◽  
Absorption Spectroscopy ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature ◽  
X Ray Absorption

scholarly journals Ferromagnetic ε-Fe2MnN: High-Pressure Synthesis, Hardness and Magnetic Properties

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1993
Author(s):  
Ulrich Schwarz ◽  
Kai Guo ◽  
William P. Clark ◽  
Ulrich Burkhardt ◽  
Matej Bobnar ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
High Temperature ◽  
Iron Nitride ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature ◽  
Manganese Nitride ◽  
Pressure Synthesis ◽  
Iron Manganese

The iron manganese nitride Fe2MnN was obtained by high-pressure–high-temperature synthesis from ζ-Fe2N and elemental Mn at 15(2) GPa and 1573(200) K. The phase crystallizes isostructural to binary ε-Fe3N. In comparison to the corresponding binary iron nitride, the microhardness of ε-Fe2MnN is reduced to 6.2(2) GPa. Above about 800 K the ternary compound decomposes exothermally under loss of nitrogen. ε-Fe2MnN is ferromagnetic with a Curie temperature of roughly 402 K.

scholarly journals Single-Crystal Structure of HP-Sc2TeO6 Prepared by High-Pressure/High-Temperature Synthesis

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1554
Author(s):  
Raimund Ziegler ◽  
Martina Tribus ◽  
Clivia Hejny ◽  
Gunter Heymann
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Ambient Pressure ◽  
Normal Pressure ◽  
Monoclinic Space Group ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

The first high-pressure scandium tellurate HP-Sc2TeO6 was synthesized from an NP-Sc2TeO6 normal-pressure precursor at 12 GPa and 1173 K using a multianvil apparatus (1000 t press, Walker-type module). The compound crystallizes in the monoclinic space group P2/c (no. 13) with a = 729.43(3), b = 512.52(2), c = 1095.02(4) pm and β = 103.88(1)°. The structure was refined from X-ray single-crystal diffractometer data: R1 = 0.0261, wR2 = 0.0344, 568 F2 values and 84 variables. HP-Sc2TeO6 is isostructural to Yb2WO6 and is built up from TeO6 octahedra, typical for tellurate(VI) compounds. During synthesis, a reconstructive transition from P321 (normal-pressure modification) to P2/c (high-pressure modification) takes place and the scandium–oxygen distances as well as the coordination number of scandium increase. However, the coordination sphere around the Te6+ cations gets only slightly distorted. High-temperature powder XRD investigations revealed a back-transformation of HP-Sc2TeO6 to the ambient-pressure modification above 973 K.

High-pressure – High-temperature Synthesis of Na6MnO4

2009 ◽  
Vol 64 (5) ◽  
pp. 487-490 ◽  
Author(s):  
Steffen Pfeiffer ◽  
Martin Jansen
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Rietveld Refinement ◽  
Title Compound ◽  
Temperature Synthesis ◽  
Hexagonal System ◽  
Space Group ◽  
X Ray ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

The title compound has been synthesized under 4 GPa and at 500 ◦C from Na2O andMnO as starting materials. Rietveld refinement of the X-ray powder pattern indicates that Na6MnO4 is isostructural to Na6ZnO4 and thus is representing the second manifestation of an “isolated” [MnO4]6− anion after Na14Mn2O9. The compound crystallizes in the hexagonal system in space group P63mc (no. 186) with a = 7.6631(2) and c = 5.9013(2) ° A, V = 300.1 °A3, and Z = 2.

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...

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