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Application of CBED Techniques of Energy Filtering TEM for Si-Al Disordering Study of Albite  

Lee Young Boo (한국기초과학지원연구원)
Kim Youn Joong (한국기초과학지원연구원)
Lee Joung Hoo (전북대학교 지구환경과학과)
Publication Information
Journal of the Mineralogical Society of Korea / v.17, no.4, 2004 , pp. 327-338 More about this Journal
Abstract
XRD studies on annealed Na-feldspar (Amelia albite) at $1100^{\circ}C$ showed rapid structural changes due to Si-Al disordering, which resulted in phase transformations from low albite to high albite by 4-days annealing test. TEM SAED analyses on the annealed samples revealed a trend of structural changes, but estimation of the structural state was difficult due to a large deviation of the SAED data. Optimum conditions of CBED analyses on albite was established by employing a cooling specimen holder, 120 kV of acceleration voltage, 37 Jim of condenser aperture size and 25 nm of spot size. A proper orientation showing distinct changes of HOLZ lines corresponding to the structure changes of albite turned out to be close to the [418] direction with $-1.2^{\circ}$ tilting, where the width of two HOLZ lines in low albite was opposite to those in high albite.
Keywords
albite; Si-Al disordering; SAED; CBED; HOLZ line;
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