Ti离子辐照诱发焦绿石Gd2Zr2O7相变的电子显微研究

功能材料, 2004, 35(1): 125-126.

Ti离子辐照诱发焦绿石Gd2Zr2O7相变的电子显微研究

祖小涛 ^1, , 练杰 ^2, , 王鲁闵 ^3,

1.电子科技大学,应用物理系,四川,成都,610054

2.Dep. of Nuclear Engineering and Radiolgical Sciences, University of Michigan, Ann Arbor, MI 48109

3.Dep. of Nuclear Engineering and Radiolgical Sciences, University of Michigan, Ann Arbor, MI 48109

基金项目: 国家自然科学基金(10175042)

关键词：相变 , 离子注入 , 焦绿石 , 阳离子无序 , 辐照效应

Ti-ion-irradiation-induced phase transition of Gd2Zr2O7 pyrochlore

通过高分辨和剖面电子显微技术研究了离子注入在单晶焦绿石Gd2Zr2O7中的产生的结构相变.在单晶Gd2Zr2O7中注入200keV Ti+离子,注量为1×1017ions/cm2,注入温度为常温.电子显微研究表明,1×1017ions/cm2的Ti+离子注入没有使样品非晶化,而是诱发了单晶Gd2Zr2O7从焦绿石结构转变成萤石结构.从高分辨像和选区电子衍射花样发现Gd3+和Zr3+发生了阳离子无序.重离子入射产生的级联碰撞致使阳离子无序被认为是相变发生的物理机制.

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