CEMS和慢正电子束研究ZrO_2(Y)中Fe的热动力学行为

THERMODYNAMICAL BEHAVIOR OF 57 Fe IMPLANTED IN ZrO 2(Y) BY CEMS AND SLOW POSITRON BEAM

用内转换电子穆斯堡尔谱（ＣＥＭＳ）和慢正电子束研究了含３％Ｙ２Ｏ３的ＺｒＯ２中５７Ｆｅ离子（１００ｋｅＶ，３×１０１６ａｔ．／ｃｍ２）注入态及其在氢气氛中退火的热力学行为．注入态以Ｆｅ３＋，Ｆｅ２＋和Ｆｅ０存在，它们分别是Ｆｅ３＋Ｖ（空位）复合体、二聚体和超顺磁颗粒．经４００，５００℃退火后，Ｆｅ３＋Ｖ分解，分别出现了αＦｅ的前期相和αＦｅ纳米颗粒．

Abstract By using conversion electron Mssbauer spectroscopy (CEMS) and slow positron beam Doppler broading spectrum,the behaviour of the 57 Fe implanted (100keV,3×10 16 at./cm 2) ZY x contained Y 2O 3 has been studied.The states of Fe 0,Fe 2+ and Fe 3+ ions were obtained from CEMS for as implanted samples.After annealing at 500℃,metallic iron particles α Fe, were formed at expense of other components. From the S E curve of the 57 Fe as implanted sample,it was found that a large amount of cationic vacancies were distributed in a region of 0—50nm in ZY 3.These vacancies disappeared largely after annealing at 500℃.Therefore the parameter S provided an evidence to identify the iron sites in the implanted sample.The ZY 3 appeared mingle conducting property at 300℃.It probably correlates with different iron charge states,especially with that of Fe 0.