High-pressure properties of TiP2O7, ZrP2O7 and ZrV2O7
2001 (English)In: Journal of Applied Crystallography, ISSN 0021-8898, Vol. 34, no 1, 7-12 p.Article in journal (Refereed) Published
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 (B0) 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.
Place, publisher, year, edition, pages
Wiley , 2001. Vol. 34, no 1, 7-12 p.
phase transformations • high-pressure diffraction • titanium pyrophosphate • zirconium pyrophosphate • zirconium pyrovanadate • negative thermal expansion • pressure amorphization.
IdentifiersURN: urn:nbn:se:su:diva-23294DOI: 10.1107/S0021889800013856OAI: oai:DiVA.org:su-23294DiVA: diva2:191233
Part of urn:nbn:se:su:diva-232004-01-212004-01-212010-01-08Bibliographically approved