摘要
利用传统高温固相反应法制备了钙钛矿钴氧化物Pr_(2-x)Tb_xCoMnO_6(x=0.00,0.05,0.10)系列多晶样品,通过样品的XRD谱线、磁化强度随温度、外加磁场的变化曲线(M-T、M-H)等对样品的晶体结构和磁性进行了研究.结果表明:系列样品Pr_(2-x)Tb_xCoMnO_6(x=0.00,0.05,0.10)呈现良好的单相性,空间点群为P2_1/n;由于Co^(2+)与Mn^(4+)之间的铁磁超交换相互作用和少量无序的Co^(3+)与Mn^(3+)之间的铁磁超交换相互作用,3个样品均出现两个铁磁转变点(T_(C1)和T_(C2)),观察到系列样品存在类Griffiths相,温度T>T_G则为纯顺磁态;在T_(C2)-T_G之间属于顺磁-铁磁共存状态;在低温区(T<T_N时),铁磁态与反铁磁态相互竞争,出现了自旋团簇玻璃行为;随着Tb的掺杂,T_(C1)、T_(C2)、T_N和T_G均下降。在测量温区内,随着温度的降低,3个样品均先后经历了纯顺磁态、顺磁-铁磁共存态、铁磁-反铁磁相互竞争的过程。
A series of polycrystalline samples of perovskite cobalt oxide Pr2-xTbxCoMnO6(x=0.00,0.05,0.10) were prepared by traditional high-temperature solid-state reaction. The XRD spectra, magnetization curves and variation curve of applied magnetic field(M-T, M-H) with temperature were measured to study the crystal structure and magnetic properties of the sample. The results show that the series of samples Pr2-xTbxCoMnO6(x=0.00,0.05,0.10) exhibited good single phase. The spatial point group was P21/n. Due to the ferromagnetic super-exchange interaction between Co2+ and Mn4+ and a small amount of disordered ferromagnetic super-exchange interaction between Co3+ and Mn3+, two ferromagnetic transition points appeared in all the three samples. It is observed that there is a Griffiths-like phase in the series of samples. When temperature T was higher than TG, it showed pure paramagnetic state. When temperature was between TC2-TG, it showed paramagnetic-ferromagnetic coexistence state. At low temperature(T<TN), the ferromagnetic state and the antiferromagnetic state competed with each other, and the behavior of spin cluster glass appeared. With the doping of Tb, TC1, TC2, TN and TG both decreased. In the measurement temperature range, with the decrease of temperature, the three samples have experienced the process of pure paramagnetic state, paramagnetic-ferromagnetic coexistence state and ferromagnetic-antiferromagnetic competition.
作者
李晓欣
刘娇
王婷
田野
云慧琴
邢茹
赵建军
LI Xiaoxin;LIU Jiao;WANG Ting;TIAN Ye;YUN Huiqin;XING Ru;ZHAO Jianjun(School of Physics Science and Technology,Baotou Teachers’College,Baotou 014030,China;Key Laboratory for Magnetism and Magnetic Material of Inner Mongolia Autonomous Region,Baotou Teachers’College,Baotou 014030,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2019年第3期3142-3146,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(11164019
51562032
61565013)
内蒙古自治区科学基金资助项目(2015MS0109)
内蒙高校科学研究基金资助项目(NJZZ11166
NJZY12202)
包头市科学技术局产学研合作资助项目(2014X1014-01
2015Z2011)
内蒙古自治区研究生科研创新资助项目(S201710127(S01)
