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  Structural transformations in cubic ZrMo2O8 at high pressures and high temperatures

Grzechnik, A., & Crichton, W. A. (2002). Structural transformations in cubic ZrMo2O8 at high pressures and high temperatures. Solid State Sciences, 4(9), 1137-1141.

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 Creators:
Grzechnik, A.1, Author           
Crichton, W. A., Author
Affiliations:
1Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370501              

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Free keywords: high-pressure high-temperature synthesis; powder x-ray diffraction; pressure-induced amorphization; negative thermal expansion; zirconium molybdate
 Abstract: High-pressure high-temperature syntheses using the gamma-
ZrMo2O8 (Pa (3) over bar, Z = 4) starting material with the
structure of the beta-ZrW2O8 type are carried out in a multi-
anvil apparatus. The recovered products are examined with
powder x-ray diffraction at ambient conditions. The sample
obtained at 1.3 GPa and 298 K is partially amorphous and
contains gamma-ZrMo2O8. Up to the onset of amorphization at 1.3
GPa, the recovered products from near room and high
temperatures are alpha-ZrMo2O8 (P (3) over bar 1c, Z = 6) and
beta-ZrMo2O8 (C2/c, Z = 4), respectively. In the structure of
alpha-ZrMo2O8, layers of ZrO6 Octahedra and MoO4 tetrahedra are
joined together by van der Waals forces. beta-ZrMo2O8 is built
of infinite ribbons of edge-sharing ZrO8 polyhedra joined by
MoO5 pyramids. The crystalline compounds synthesized at
pressures above 1.3 GPa and at high temperatures. originate
from the pressure-induced amorphous phase of gamma-ZrMo2O8. The
higher the pressure during the synthesis the higher the
temperature necessary to obtain a recoverable crystalline
product. Up to about 4 GPa, the synthesized material is beta-
ZrMo2O8. The recovered crystalline phases from above 4.0 GPa
are the ZrO2-MoO3 decomposition products. One of them is the
high-pressure high-temperature form Of MoO3 (P2(1)/m, Z = 2),
with all the Mo atoms in the octahedral coordination. (C) 2002
Editions scientifiques et medicales Elsevier SAS. All rights
reserved.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 7106
ISI: 000179167500004
 Degree: -

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Title: Solid State Sciences
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 4 (9) Sequence Number: - Start / End Page: 1137 - 1141 Identifier: ISSN: 1293-2558