摘要
采用高温固相反应法制备了双钙钛矿氧化物Gd1.7Ce0.3NiMnO6多晶样品。该样品呈现良好的单相性,空间点群为单斜晶系P21/n;样品在T>TG为纯顺磁态,TC<T<TG为顺磁-铁磁共存态,在此温区样品出现类Griffiths相;外场为7T时,Gd1.7Ce0.3NiMnO6在居里温度附近出现ΔSM最大值,为-2.376J/(kg·K);其RCP为213.88J/kg,具备作为高温区磁制冷材料的潜能;Arrott曲线、重标定曲线以及Loop曲线皆证明该样品的铁磁-顺磁转变为二级相变。
The double perovskite oxide Gd1.7Ce0.3NiMnO6polycrystalline sample is prepared by high temperature solid phase reaction.The sample exhibits good single-phase properties,and the spatial point group is monoclinic P21/n;the sample is pure paramagnetic state at T>TG,and TC<T<TGis paramagnetic-ferromagnetic coexistence state.The sample has a Griffiths-like phase;when the external field is 7T,Gd1.7Ce0.3NiMnO6has a maximumΔSM near the Curie temperature,which is-2.376J/(kg·K);its RCP is 213.88J/kg,which has the potential to be a magnetic refrigeration material in high temperature areas.Arrott curve,recalibration curve,and Loop curve all prove that the ferromagnetic-paramagnetic transformation of the sample is a second-order phase transition.
作者
李晓欣
邢茹
赵建军
刘娇
王婷
郑琳
LI Xiaoxin;XING Ru;ZHAO Jianjun;LIU Jiao;WANG Ting;ZHENG Lin(Physics Institute of Science and Technology,Baotou Teachers'College,Baotou 014030,China;Key Laboratory for Magnetism and Magnetic Material of Inner Mongolia Autonomous Region,Baotou 014030,China)
出处
《有色金属工程》
CAS
北大核心
2019年第11期14-19,共6页
Nonferrous Metals Engineering
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（2015MS0109）
内蒙古自治区高等学校科学研究基金（NJZZ11166,NJZY12202,NJZY17291）
包头市科学技术局产学研合作项目（2014X1014-01,2015Z2011)~~
关键词
双钙钛矿
类Griffiths相
磁制冷效率
二级相变
double perovskite
Griffiths-like phase
magnetic refrigeration efficiency
second-order phase transition
