CAJ | 학술논문

采用溶胶-凝胶法在不同的烧结温度下制备了La1.2Sr1.8Mn2O7多晶样品.磁性测量表明,1 200℃热处理的样品存在3个磁转变温度,且在116 K～365 K温区范围内磁化强度显著高于1 400℃热处理的样品;同时,1 400℃热处理的样品,在整个温区只存在2个磁有序转变温度,并且呈现出类自旋玻璃态.结合这2个样品的结构分析发现,较高温度处理更有利于双层钙钛矿结构的形成.
채용용효-응효법재불동적소결온도하제비료La1.2Sr1.8Mn2O7다정양품.자성측량표명,1 200℃열처리적양품존재3개자전변온도,차재116 K～365 K온구범위내자화강도현저고우1 400℃열처리적양품;동시,1 400℃열처리적양품,재정개온구지존재2개자유서전변온도,병차정현출류자선파리태.결합저2개양품적결구분석발현,교고온도처리경유리우쌍층개태광결구적형성.
La1.2Sr1.8Mn2O7 bluk samples are prepared under various anneal temperatures by sol-gel reaction.Magnetic properties measurements show that three magnetic transition temperatures are found in the sample annealed at 1 200℃,and the magnetization much higher at 116-365 K temperature range than the sample annealed at 1 400℃.For the sample annealed at 1 400℃,the magnetization exhibits the cluster-spin-glass behavior,and only two magnetic transition temperatures are found from high temperature to low temperature.With the structure analysis of the two samples,we consider that higher anneal temperatures are propitious to the form of layered manganites.