Orthorhombic-Cubic Phase Transition in Rb2CoSi5O12 Leucite Analogue

MINERALS（2023）

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摘要

An Rb2CoSi5O12 leucite analogue has been synthesized. An ambient temperature X-ray powder diffraction study shows that this analogue has the Pbca orthorhombic structure of Cs2CdSi5O12. A high temperature X-ray powder diffraction study on this analogue shows a Pbca orthorhombic to Pa3 over bar cubic phase transition at 457 K. The Rb2CoSi5O12 unit cell volume initially decreases with increasing temperature on passing through this phase transition.

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关键词

X-ray powder diffraction,minerals,phase transitions,leucite silicate framework structures,Rietveld refinement

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