AgNO_3对多晶材料La_(0.6)Sr_(0.05)Na_(0.35)MnO_3结构和磁性的影响  

Structure and Magnetic Influence of AgNO_3 on the Crystal Bulk Material La_(0.6)Sr_(0.05)Na_(0.35)MnO_3

作　　者：户立春[1] 赵宏微[2] 唐贵德[3] 

机构地区：[1]唐山学院基础教学部,河北唐山063000 [2]河北联合大学理学院,河北唐山063000 [3]河北师范大学物理科学与信息工程学院,河北石家庄050024

出　　处：《河北师范大学学报（自然科学版）》2012年第6期580-583,共4页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(11174069);河北省自然科学基金(E2011205083)

摘　　要：采用溶胶-凝胶法制备了多晶La0.6Sr0.05Na0.35MnO3粉体样品,用固相反应法制备了La0.6Sr0.05Na0.35MnO3+xAgNO3(x=0.08,0.16)的粉体样品,块体于1 673K烧结得到.结果在样品中发现了Ag和Mn3O4相,对母体样品的晶格常数和晶胞体积都有微小影响;样品的居里温度随掺杂AgNO3含量的增加而增加;在1.8T磁场下La0.6Sr0.05Na0.35MnO3+0.16AgNO3的块体材料在283K出现磁电阻峰值,为27%;La0.6Sr0.05Na0.35MnO3+0.08AgNO3块体也在283K左右出现峰值,为32%,在210～260K时磁电阻随温度变化不大.La_（0.6）Sr_（0.05）Na_（0.35）MnO_3 polycrystalline sample was synthesized by sol-gel method.The La_（0.6）Sr_（0.05）Na_（0.35）MnO_3 ＋xAgNO3（x=0.08,0.16） was prepared by conventional solid state reaction method and the palletized samples were heated at 1 673K.Ag and Mn3O4were found in the samples,and thus they had a minor impact on the lattice constant of the parent sample and the cell volume;Curie temperature increased with the doping of AgNO3content increases;Under an applid filed of 1.8T,there is a MR maximum 27% of La_（0.6）Sr_（0.05）Na_（0.35）MnO_3＋0.16AgNO 3 at 283K;and a MR maximum 32% of La 0.6 Sr 0.05 Na 0.35 MnO3＋0.08AgNO3 at 283K.At 210～260K,there is little change in magnetoresistance of these two samples.So temperature stability of magnetoresistance is improved,which supplies a new method to improve magnetoresistance and temperature stability of magnetoresistance.

关 键 词：磁电阻 钙钛矿结构 溶胶-凝胶法 固相反应法 

分 类 号：O482.5[理学—固体物理]