Microstructures and orientation relationships in the dry-state aragonite-calcite and calcite-lime phase transformations

The aragonite-calcite and calcite-lime (CaO) transformations were observed in situ by high-voltage TEM. Above 400°C aragonite single-crystals begin to transform into calcite through heterogeneous nucleation on dislocations, twin boundaries, and modulated microstructures. Subsequent growth is general...

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Bibliographic Details
Published in:The American mineralogist 1985-12, Vol.70 (11-12), p.1253-1261
Main Authors: McTigue, Jr, Wenk, Hans-Rudolf
Format: Article
Language:English
Subjects:
aragonite
calcite
calcium carbonate
carbonates
crystal growth
crystal structure
experimental studies
high temperature
high-resolution methods
microstructure
mineral data
Mineralogy
minerals
natural materials
nonsilicates
nucleation
orientation
phase equilibria
polymorphism
TEM data
temperature
transformations
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Summary:The aragonite-calcite and calcite-lime (CaO) transformations were observed in situ by high-voltage TEM. Above 400°C aragonite single-crystals begin to transform into calcite through heterogeneous nucleation on dislocations, twin boundaries, and modulated microstructures. Subsequent growth is generally topotactic.
ISSN:0003-004X
1945-3027