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- W2507232912 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 P6 3 22⇄P6 3 is tentatively suggested with the concomitant development of merohedral twins. Spontaneous strain determinations suggest that the transition is close to being tricritical in character. Above ∼750°C kaliophilite crystals undergo a first order epitaxial phase transition to a different hexagonal phase with a=8.9 A and c=8.4 A. Dark and bright field images in the TEM show the presence of twins and heterogeneously distributed linear defects. These are interpreted respectively as transformation twins and stacking defects incorporated during crystal growth. 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" @default.
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- W2507232912 date "1992-12-15" @default.
- W2507232912 modified "2023-09-26" @default.
- W2507232912 title "Phase transitions and microstructures in natural kaliophilite" @default.
- W2507232912 doi "https://doi.org/10.1127/ejm/4/6/1209" @default.
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