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TEM Investigations of Structures and Phase Transitions in Tridymite  

김윤중 (한국기초과학지원연구원 중앙분석기기부)
Publication Information
Journal of the Mineralogical Society of Korea / v.15, no.1, 2002 , pp. 44-58 More about this Journal
Abstract
A new polymorph of tridymite, an incommensurately modulated phase (IC phase), has been identified. While the symmetry of the IC lattice is same as that of the Ll phase, the geometry of the IC lattice structure is same as the basis of the L3 structure with a different modulation (modulation vector q=0.22 $c*_{H}$;$\lambda$ 37 ). On the other hand, the characteristic curved diffuse diffration observed from the Ll atoms could occur even at room phase suggests that the dynamic disordering of atoms, especially oxygen atoms could occur even at room temperature. The phase transition of Ll to L3 by grinding is gradual but very conspicuous: LllongrightarrowL1+IClongrightarrowIC+L3longrightarrowL3. However, it is revealed that real transition processes of individual grains are directly related to the local stress fields and preexisting microstructures.
Keywords
tridymite; tridymite; polymorphs; phase transitions; IC phase; dynamic disordering;
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