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新型混合导电陶瓷Sm0.9Sr0.1Al1–xCrxO3–δ的制备及电性能

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Abstract:

采用有机凝胶法结合后期的高温烧结制备Sm0.9Sr0.1Al1–xCrxO3–δ(SSAC,x=0~0.4)系列氧离子–电子混合导电陶瓷。用热重–差热分析、X射线衍射、扫描电子显微镜和直流四引线法等技术分别表征凝胶前驱体的热分解及相演化过程和烧结体的晶体结构、微观形貌以及电导率。结果显示凝胶前驱体经900℃焙烧5h可以形成结晶良好的正交钙钛矿相纳米粉体;SSAC陶瓷的电导率主要取决于p型电导,其导电行为符合小极化子绝热跳跃传输机制;随着烧结温度的升高,Sm0.9Sr0.1Al0.6Cr0.4O3–δ的电导率和相对密度都先增大后减小,1550℃烧结10h的样品具有最高的电导率和相对密度;SSAC陶瓷的电导率以及晶格常数随Cr掺量x的增加呈现出相同的变化规律,即先增大后减小,当x>0.2时又开始变大,而相应的活化能的变化行为则刚好与之相反。

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