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第7回フロンティア材料研究所講演会 (Eleonora Kulik)

開催日時 2016/06/30 13:30 -14:00
開催場所 R3棟1階 会議室
主催フロンティア材料研究所
連絡先若井 史博 教授(内線:5361)

プログラム等

第7回フロンティア材料研究所講演会

講師: Eleonora Kulik
    (Deutsches Elektronen-Synchrotron, Germany)

演題: "Thermal expansion of coesite: A synchrotron X-ray diffraction study from 100 K up to 1000 K"

講演概要:
 Coesite is the densest silica polymorph in which silicon is tetrahedrally coordinated by oxygen .However, contrary to other low pressure forms of SiO2, coesite does not undergo α-β transition at least up to 1776 K, it also exhibit much lower thermal expansion than quartz and crystobalite. In this work high-temperature structural features of synthetic coesite and its behavior at the microscopic level have been investigated by X-ray powder diffraction . We observed that the thermal expansion of coesite is strongly anisotropic and negative along a c axis . It leads to a very low volume expansion by only 0.7% in the considered temperature range between 100 K and 1000 K. For the material research and ceramic industry the importance of such kind of materials is in their widespread use in high anti-thermal shock applications.

 

 

 

 

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