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XRD and TEM Investigations of Structures and Phase Transformations in Albite  

김윤중 (한국기초과학지원연구원 전자현미경팀)
이영부 (한국기초과학지원연구원 전자현미경팀)
Publication Information
Journal of the Mineralogical Society of Korea / v.16, no.1, 2003 , pp. 91-106 More about this Journal
Abstract
XRD results on annealing studies of Na-feldspars (Amelia albite) show rapid changes in the lattice parameters of the $1073^{\circ}C$-heated samples owing to disordering of Al and Si as well as lattice distortions upon quenching of the heated specimens. While a low albite transformed to a high albite by 7-days annealing at $1073^{\circ}C$, it remains as an early intermediate albite even by 140-days annealing at $924^{\circ}C$ due to the slower Al-Si disordering rate. From the heated samples tweed structures of $100∼200\AA$ were typically observed by TEM, which showed different ways of development between the $1073^{\circ}C$ -heated one and the $923 ^{\circ}C$ -heated one. The former locally trans-farmed to rnicrostructures similar to albite twin, while the latter transformed to domain structures containing albite twin plane in the wider area. The origin of tweed structures is suggested to be formation of incipient twins (albite twin and pericline twin) to reduce the lattice instability which is increased by disordering of Al and Si as well as quenching.
Keywords
albite; Al-Si disordering; lattice distortion; tweed structure; twin;
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