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High-pressure properties of TiP2O7, ZrP2O7 and ZrV2O7

Carlson, Stefan LU and Andersen, Anne Marie Krogh (2001) In Journal of Applied Crystallography 34(1). p.7-12
Abstract

High-pressure synchrotron X-ray powder diffraction studies of TiP2O7, ZrP2O7 and ZrV2O7 have been performed. The ZrV2O7 structure undergoes a reversible transition at 1.38-1.58 GPa from cubic α- to pseudo-tetragonal β-ZrV2O7 that displays an orthorhombic 2 × 3 × 3 supercell. At pressures above 4 GPa, ZrV2O7 becomes irreversibly X-ray amorphous. No such transformations are observed for TiP2O7 and ZrP2O7, which compress smoothly up to the highest investigated pressures (40.3 and 20.5 GPa, respectively). These differences in high-pressure properties are discussed in... (More)

High-pressure synchrotron X-ray powder diffraction studies of TiP2O7, ZrP2O7 and ZrV2O7 have been performed. The ZrV2O7 structure undergoes a reversible transition at 1.38-1.58 GPa from cubic α- to pseudo-tetragonal β-ZrV2O7 that displays an orthorhombic 2 × 3 × 3 supercell. At pressures above 4 GPa, ZrV2O7 becomes irreversibly X-ray amorphous. No such transformations are observed for TiP2O7 and ZrP2O7, which compress smoothly up to the highest investigated pressures (40.3 and 20.5 GPa, respectively). These differences in high-pressure properties are discussed in terms of the negative thermal expansion of ZrV2O7. The bulk moduli at ambient pressure (Bo) for TiP2O7, ZrP2O7, α-ZrV2O7 and β-ZrV2O7 were estimated to be 42 (3), 39 (1), 17.0 (7) and 20.8 (10) GPa, respectively.

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author
organization
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type
Contribution to journal
publication status
published
in
Journal of Applied Crystallography
volume
34
issue
1
pages
6 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:14944354534
ISSN
0021-8898
DOI
10.1107/S0021889800013856
language
English
LU publication?
yes
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3b1fdcc2-44ba-43f2-bff0-dbee12a73204
date added to LUP
2016-05-04 11:49:43
date last changed
2017-05-21 04:50:29
@article{3b1fdcc2-44ba-43f2-bff0-dbee12a73204,
  abstract     = {<p>High-pressure synchrotron X-ray powder diffraction studies of TiP<sub>2</sub>O<sub>7</sub>, ZrP<sub>2</sub>O<sub>7</sub> and ZrV<sub>2</sub>O<sub>7</sub> have been performed. The ZrV<sub>2</sub>O<sub>7</sub> structure undergoes a reversible transition at 1.38-1.58 GPa from cubic α- to pseudo-tetragonal β-ZrV<sub>2</sub>O<sub>7</sub> that displays an orthorhombic 2 × 3 × 3 supercell. At pressures above 4 GPa, ZrV<sub>2</sub>O<sub>7</sub> becomes irreversibly X-ray amorphous. No such transformations are observed for TiP<sub>2</sub>O<sub>7</sub> and ZrP<sub>2</sub>O<sub>7</sub>, which compress smoothly up to the highest investigated pressures (40.3 and 20.5 GPa, respectively). These differences in high-pressure properties are discussed in terms of the negative thermal expansion of ZrV<sub>2</sub>O<sub>7</sub>. The bulk moduli at ambient pressure (Bo) for TiP<sub>2</sub>O<sub>7</sub>, ZrP<sub>2</sub>O<sub>7</sub>, α-ZrV<sub>2</sub>O<sub>7</sub> and β-ZrV<sub>2</sub>O<sub>7</sub> were estimated to be 42 (3), 39 (1), 17.0 (7) and 20.8 (10) GPa, respectively.</p>},
  author       = {Carlson, Stefan and Andersen, Anne Marie Krogh},
  issn         = {0021-8898},
  language     = {eng},
  number       = {1},
  pages        = {7--12},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Applied Crystallography},
  title        = {High-pressure properties of TiP2O7, ZrP2O7 and ZrV2O7},
  url          = {http://dx.doi.org/10.1107/S0021889800013856},
  volume       = {34},
  year         = {2001},
}