High-pressure properties of TiP2O7, ZrP2O7 and ZrV2O7

Summary, in English

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.

• Författare: Stefan Carlson; Anne Marie Krogh Andersen
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2001
• Språk: Engelska
• Sidor: 7-12
• Publikation/Tidskrift/Serie: Journal of Applied Crystallography
• Volym: 34
• Issue: 1
• Länkar: http://dx.doi.org/10.1107/S0021889800013856
• Dokumenttyp: Artikel i tidskrift
• Förlag: International Union of Crystallography
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0021-8898