Lattice parameter determination of mullite by energy-filtered needle-texture electron diffraction pattern SCIE SCOPUS

Cited 1 time in WEB OF SCIENCE Cited 2 time in Scopus
Title
Lattice parameter determination of mullite by energy-filtered needle-texture electron diffraction pattern
Author(s)
Lee, S; Kim, YJ; Jou, HT; Moon, HS
KIOST Author(s)
Jou, Hyeong Tae(주형태)
Publication Year
2005-01
Abstract
The thermal transformations of pyrophyllite to mullite by heating were re-examined using mainly energy-filtering transmission electron microscopy and, for the first time, the texture electron diffraction pattern of the mullite was completely interpreted. Through a temperature range in which pyrophyllite dehydroxylate maintained a long-range order with a fluctuation of similar to 1% in d-spacings of (100) and (010) planes at 1000 degrees C, without prominent exothermic feature, pyrophyllite dehydroxylate was gradually decomposed and transformed into mullite through topotaxy. Pyrophyllite dehydroxylate did not collapse completely until 1100 degrees C, which promoted the rapid growth of mullite in random orientation at 1200 degrees C and the crystallization of amorphous silica to cristobalite at 1300 degrees C. The mullite needles, having their c-axis (texture axis) parallel to the elongation direction, lined up along the b(*)-axis of the pyrophyllite dehydroxylate in the needle-texture electron diffraction patterns. The mullite needles had monoclinic symmetry with lattice parameters of 7.27 angstrom (a), 7.75 angstrom (b), 2.90 angstrom (c), 90 degrees (alpha), 90 degrees (beta) and 88.41 degrees (gamma), which, because of the structural affiliation to the parent pyrophyllite dehydroxylate, differ to the orthorhombic 3/2-mullite.
ISSN
0022-0744
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5110
DOI
10.1093/jmicro/dfh099
Bibliographic Citation
JOURNAL OF ELECTRON MICROSCOPY, v.54, no.1, pp.35 - 41, 2005
Publisher
OXFORD UNIV PRESS
Subject
THERMAL TRANSFORMATIONS; PYROPHYLLITE
Keywords
mullite; lattice parameter; needle-texture electron diffraction pattern
Type
Article
Language
English
Document Type
Article
Publisher
OXFORD UNIV PRESS
Related Researcher
Research Interests

Machine Learning,Marine Active Fault Study,Exploration Seismology,기계학습,해저단층연구,탄성파탐사

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse