プラセオジム及びコバルト添加酸化亜鉛バリスターのオージェ電子スペクトル

概要

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The distribution of elements in Pr-doped ZnO varistors was analyzed by means of an Auger electron spectra (AES)method.The samples used were ZnO varistor doped with Pr, Co, Cr, Ca and K ions.AES were obtained from fresh fractured surfaces to prevent surface contamination.The results indicated that Pr, K, Ca ions segregated in a grain boundary region.No peak, corresponding to the Co ion, was found indicating that the Co ions homogeneously dissolved ZnO grains.Changes in AES profiles with the concentration of the dopants were observed for a KL_<23>L_<23> transition of O ion.The KL_<23>L_<23> transition consisted of four peaks whose intensity ratio varied with the concentration of the dopants.The effect of dopant, i.e.Co ion, on the AES were discussed on the basis of molecular orbital calculation for a cluster model[MZn_9O_10](M=Zn, Co).
社団法人日本セラミックス協会の論文
1998-09-01