Diffusion-induced amorphization in yttrium-iron garnet imbedded with ZrO2 particles

被引:5
|
作者
Peng, CH [1 ]
Lin, YC [1 ]
Shen, PY [1 ]
机构
[1] NATL SUN YAT SEN UNIV,INST MAT SCI & ENGN,KAOHSIUNG 80424,TAIWAN
关键词
diffusion-induced amorphization; yttrium-iron garnet;
D O I
10.1016/S0921-5093(97)00115-9
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Yttria-iron garnet (YIG)/ZrO2 (5 mol.%) composites, red at 1450 degrees C in oxygen atmosphere for 8, 16 and 96 h, were studied by transmission electron microscope with regard to a possible diffusion-induced amorphization (DIA) process within the YIG lattice. Lattice image shows an amorphous zoning of YIG around the intragranular ZrO2 particles where possible grain-boundary wetting effect can be avoided, and next to the YIG/ZrO2 interface where the gradient of inward Zr flux or outward Fe flux is presumed to be large. As a result of such a solid-state amorphization, the lattice planes are still parallel-aligned in the opposite sides of the amorphous zoning. Structural and chemical considerations further suggest that amorphization proceeds by cellular disordering of Zr4+, Fe3+ and Fe2+ (charge compensating defect due to Zr4+ substitution for Fe3+) in the array of octahedral sites and facilitated indirectly by dislocations acting as source and sink of vacancies. An ordering process, subsequent to DIA, caused the formation of non-dendritic alpha-Fe2O3 islands in the relatively high Fe/Zr ratio region of the amorphized zoning. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:150 / 156
页数:7
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