EXAFS Studies on Fluorites of β-PbF_2 and SrF_2

概要

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Extended X-ray absorption fine structure (EXAFS) studies are carried outfor fluorites, /7-PbF. (at 80 K, 293 K and 640 K) and SrF. (at 293 K and 640 K)to investigate their ion conduction mechanism of anion. In /l'-PbF. it is found thatfluorine ion does not occupy only the center of the Pb tetrahedron site but displacesalong<111>into several separate sites even at 80K and this tendency is re-markably increased as temperature increased up to its transition temperature.In SrF. it is found thxt fluorine ton also displaces along (111 ) but is smaller inquatity at the same temperature as compared with /7-PbF. . These interstitial anionsplay a key role in ton conduction process indicating that hopping model of anionis probable.
社団法人日本物理学会の論文
1984-12-15