用红外光谱技术分析Sm2Zr2O7的形成机制
Analysis of Sm2Zr2O7 Forming Mechanism with Infrared Spectra
摘 要
采用红外光谱(FT-IR)技术分析了以Sm2O3和ZrO2为原料,固相反应制备Sm2Zr2O7的形成机制.结果表明：Sm2O3中的Sm3+逐渐向ZrO2晶格中扩散并取代Zr4+的位置形成萤石结构的ZrO2-Sm2O3固溶体,由于二者化合价的差别为保持晶格结构局部的电中性而引入了氧空位,氧空位的引入加快了ZrO2与Sm2O3固溶过程;随着温度的升高,已形成ZrO2-Sm2O3固溶体转变为焦绿石结构的Sm2Zr2O7,并在1 500℃以后形成Sm2Zr2O7晶体,整个过程没有其它中间相出现.
红外光谱
固溶体
氧空位
Sm2Zr2O7
infrared spectra
solid solution
oxygen vacancy
Abstract
The forming mechanism of Sm2Zr2O7 prepared by solid reactions using ZrO2 and Sm2O3 as raw materials was studied by FT-IR technology.The results show that the samarium ion entered zirconia crystal and substituted the zirconium ion in order to form ZrO2-Sm2O3 solid solution.Because of the difference in valency,the oxide vacancy was incorporated to maintain the electroneutrality,and the incorporation of oxide vacancy accelerated the forming procedure of fluorite ZrO2-Sm2O3 solid solution.With the raising of temperature,the formed ZrO2-Sm2O3 solid solution transformed gradually into pyrochlore structure Sm2Zr2O7 until forming ideal Sm2Zr2O7 crystal.There was no other phase in the whole procedure.
中图分类号 O655
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收稿日期 2007/4/27
修改稿日期 2007/6/12
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备注胡仁喜(1976-),男,湖北黄石人,讲师,博士.
引用该论文: HU Ren-xi,ZHANG Hong-song,CHEN Xiao-ge,WEI Yuan. Analysis of Sm2Zr2O7 Forming Mechanism with Infrared Spectra[J]. Materials for mechancial engineering, 2008, 32(3): 35～37
胡仁喜,张红松,陈晓鸽,魏媛. 用红外光谱技术分析Sm2Zr2O7的形成机制[J]. 机械工程材料, 2008, 32(3): 35～37
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【10】Subramanian M A,Aravamudan G,Subba Rao.Oxides pyrochlores-a review[J].Progress of Solid State Chemistry,1983,15:55-143.
【11】McCauley R A.Infrared-absorption characterials of the pyrochlore structure[J].Journal of the Optical Society of America,1973,63(6):721-725.
【12】McCaffrey J F,McDevitt N T,Phillippi C M.Infrared lattice spectra of rare-earth stannate and titanate pyrochlores[J].Journal of the Optical Society of America,1971,61(2):209-212.
【13】Yshima M,Ishizwa N,Yoshimura M.Application of an ion-packing model based on defect clusters to zirconia solid solutions.ⅡApplicability of Vegard’s Law[J].Journal of the American Ceramic Society,1992,75:1550-1557.
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【18】樊先平,洪樟连,翁闻剑,等.无机非金属材料科学基础[M].杭州:浙江大学出版社,2003.
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