Microstructure and densification mechanism of low temperature sintering Bi-Substituted yttrium iron garnet
Microstructure and densification mechanism of low temperature sintering Bi-Substituted yttrium iron garnet
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DOI：
10.1007/s10832-007-9300-6
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发表时间：
2008-12
影响因子：
1.7
通讯作者：
Hongjie Zhao;Ji Zhou;Bo Li;Z. Gui;Long-tu Li
中科院分区：
文献类型：
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作者：
Hongjie Zhao;Ji Zhou;Bo Li;Z. Gui;Long-tu Li
本文研究了掺铋钇铁石榴石(Bi：YIG)多晶样品的低温烧结和致密化机理。采用固相反应法制备了组成为Y3−xBixFe5O12(x= 0-1.2)的多晶样品。X射线衍射图表明，掺铋可使石榴石相的形成温度从1200℃降至900℃左右；热机械分析(TMA)表明，陶瓷的烧结温度可从1350℃以上降至1000℃以下。用X射线能谱(EDS)分析了铋在晶界和晶界的分布。烧结过程中存在含铋氧化物的液相，导致烧结温度降低。
The low temperature sintering and densification mechanism of Bi-substituted yttrium iron garnet (Bi:YIG) polycrystalline samples were studied in this paper. The Bi:YIG polycrystalline samples, with the composition of Y3−xBixFe5O12(x= 0–1.2), were prepared by the solid-state reaction method. The X-ray diffraction (XRD) patterns show that Bi-substitution can lower the formation temperature of garnet phase from about 1200 to 900 °C and the thermo-mechanical analysis (TMA) indicates that the sintering temperature of ceramics can be decreased from over 1350 °C to below 1000 °C. The microstructure of grains and grain boundaries was observed by high resolution electron microscopy (HREM). The bismuth distribution in grains and grain boundaries was performed by X-ray energy dispersive spectroscopy (EDS). The occurrence of liquid phase with Bi-contained oxide in the sintering process caused the decrease in sintering temperature.