THE HIGH-TEMPERATURE PHASE-TRANSITION IN PEROVSKITE

Vogt, T. und Schmahl, Wolfgang W. (1993): THE HIGH-TEMPERATURE PHASE-TRANSITION IN PEROVSKITE. In: Europhysics Letters, Bd. 24, Nr. 4: S. 281-285

Abstract

Perovskite (CaTiO3) is a model compound for the Earth’s most abundantmineral, the perovskite (Mg, Fe)SiO3. High-temperature structuralinvestigations using neutron powder diffraction reveal a phasetransition to a highly disordered cubic phase. As one approaches thistransition, the TiO6 octahedra become less distorted and theirrotational disorder is reflected by the large atomic-displacementparameters of the oxygens in the (a, b)-plane, suggesting that thehigh-temperature transition to the cubic phase could be triggered by theonset of mobility in the oxygen sublattice. This would account for thefact that no intermediate tetragonal phase is observed.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Geowissenschaften > Department für Geo- und Umweltwissenschaften > Kristallographie und Materialwissenschaft
• Themengebiete: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• Sprache: Englisch