摘要
采用传统固相反应法在不同烧结温度下制备了La_(0.6)Sr_(0.4)MnO_3样品,通过X射线衍射仪(XRD)和扫描电镜显微镜(SEM)对样品进行了物相结构和微观组织分析,比较了不同烧结温度下样品的烧结性、介电性和铁磁性能。研究结果表明,当烧结温度从1100℃增加到1200℃时,La_(0.6)Sr_(0.4)MnO_3样品的介电损耗呈降低趋势,介电常数数值呈增加趋势,并在测量频率范围内显示负值。随着烧结温度的增加,La_(0.6)Sr_(0.4)MnO_3样品的铁磁性呈现先上升后下降的趋势。当烧结温度为1150℃时,其饱和磁化强度达到最大,为37.80A·m^2·kg^(-1)。说明可以通过改变煅烧温度来有效调节晶粒尺寸,从而改进La_(0.6)Sr_(0.4)MnO_3样品的介电性能和铁磁性能。
La_（0.6）Sr_（0.4）MnO_3 samples were successfully synthesized by the traditional solid state reaction technology at the different calcination temperature.Phase constitution and microstructure of the prepared samples were analyzed by X-ray Diffraction（XRD）and scanning electron microscope（SEM）.The sinterability,dielectric property and ferromagnetic properties were also studied for samples sintered at the different temperature.The results showed that dielectric loss and permittivity of La_（0.6）Sr_（0.4）MnO_3 samples have a tendency of show descending and ascending trend respectively at with the calcination temperature ranges increasing from 1100℃ to 1200℃.Within the scope of frequency measured,it also exhibited negative permittivity.In addition,it is found that the ferromagnetic property of La_（0.6）Sr_（0.4）MnO_3 first increases and then decreases with the calcination temperature increased.When the calcination temperature is 1150℃,its the Ms reaches the maximum with of 37.80 A·m^2·kg^（-1）.It indicates that calcination temperature can change grain size to effectively regulate tune dielectric property and ferromagnetic feature by changing grain size of La_（0.6）Sr_（0.4）MnO_3 samples.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2018年第1期26-30,共5页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(B010701)
安徽省科技攻关资助项目(1604a0802122)
中国博士后科学基金资助项目(2014M550337)
校青年基金资助项目(QN 201403)
