Phase transitions and microstructures in natural kaliophilite

D. Cellai, M. A. Carpenter, P. J. Heaney

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

An investigation using TEM, high temperature X-ray powder diffraction and high temperature single-crystal X-ray diffraction revealed previously unreported microstructures and phase transitions in natural kaliophilite. Measurements of unit cell dimensions from room temperature to 895°C indicate the existence of a displacive phase transition at ~725°C between two hexagonal phases with the same unit cell. A symmetry change of P6322 ⇄ P63 is tentatively suggested with the concomitant development of merohedral twins. The thermal evolution of kaliophilite is sufficiently different from that of kalsilite to indicate that it has a different framework topology and is not a true stuffed tridymite structure. -from Authors

Original languageEnglish (US)
Pages (from-to)1209-1220
Number of pages12
JournalEuropean Journal of Mineralogy
Volume4
Issue number6
DOIs
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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