THE RELATION BETWEEN PREEXISTING DEFECTS AND CHARGING-UP IN 9mol%Y2O3-ZrO2 STUDIED BY AUGER ELECTRON SPECLROSCOPY

Electron beam damage and charging process in 9mol%Y₂O₃-stabilized zirconia (YS-ZrO₂) are studied by Auger electron spectroscopy (AES). Electron bombardment induces electron-stimulated desorption at the surface on one hand; on the other hand, it modifies the preexisting defects in the irradiated zone. Both effects will lead to charging-up of YS-ZrO₂. The charging related to the first effect can be compensated by an O₂ environment of 6.5×10^-6 Pa, and the charging related to both effects can be inhibited by specimen heating up to 300℃. However, the modified preexisting defects will not return to their initial states prior to the radiation. Their charging behavior and charge compensation are discussed in the model of the variants of the oxygen vacancies.     

一个大气氧压下Y_（0．9）Ca_（0．1）Ba_2Cu_4O_8掺Ag_2O复

在一个大气压的流动氧气氛中，通过重复烧结，合成了具有良好超导特性的Ｙ０．９Ｃａ０．１Ｂａ２ＣＵ４Ｏ８＋１０％ＷｔＡｇ２Ｏ复合块材．采用ＸＲＤ和ＳＥＭ技术对样品的结构分析表明：固相ＡＳ。Ｏ的加入对Ｙ０．９Ｃａ０．１Ｂａ２Ｃｕ４Ｏ８的相结构形成具有与熔融银添加法完全类似的加速作用；发现了存在于样品内部的Ａｇ偏聚和异常结构分布；探讨了不同掺Ａｇ２Ｏ工艺对样品结构和性能的影响．     

在织构Ag基带上制备YBa2Cu3O7-δ超导膜

在织构Ａｇ基带上用脉冲激光方法沉积ＹＢａ２Ｃｕ３Ｏ７－δ超导膜,直流电阻法测量超导膜的临界电流密度为４×１０＾５Ａ／ｃｍ＾２。结合生成膜的结构分析,对ＹＢａ２Ｃｕ３Ｏ７－δ超导体在Ａｇ基带上的生长机制进行讨论。