为了解决在空气条件下热处理温度和次数对含有B位空位锰氧化物La0.75Sr0.25Mn0.95△0.05O3中氧含量影响的物理问题,采用改进的溶胶凝胶法,成功制备了名义成分为La0.75Sr0.25Mn0.95△0.05O3的钙钛矿锰氧化物材料,先后对样品在973,107 3,127 3,147 3 K进行了4次热处理,对其结构和磁性进行了研究.结果表明,经973 K热处理后样品晶粒表面明显缺氧,导致其中存有碳元素;经过后3次热处理,样品的氧含量逐渐增加,从正分到过剩.结合晶体缺陷热平衡理论,氧含量过剩时,实际上形成了B位含有空位的AB1-△-zO3型钙钛矿结构.
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