首页|Dy掺杂Pr0.87Ca0.13MnO3体系的磁热效应和临界行为的研究

Dy掺杂Pr0.87Ca0.13MnO3体系的磁热效应和临界行为的研究

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钙钛矿结构金属氧化物展现出了丰富的磁性,A位掺杂对磁性能的调控也是钙钛矿结构金属氧化物研究的重要方向.采用高温固相反应法制备了 Pr(0.87-x)DyxCa0.13MnO3(x=0,0.05,0.1,0.15)系列多晶样品,重点研究了Dy3+掺杂量对母相Pr0.87Ca0.i3MnO3样品晶体结构、磁热效应和临界行为的影响.Pr(0.87-x)DyxCa0.13MnO3(x=0,0.05,0.1,0.15)系列样品具有良好的结晶度,纯度很高,空间点群为正交晶系Pnma,属于立方结构;Pr0.82Dy0.05Ca0.13MnO3样品可能是一种优良的磁制冷材料,其制冷能力(RC值)为114.73 J·kg-1(0～3 T)、222.92 J·kg-1(0～5 T)、351.88 J·kg-1(0～7 T),相对制冷能力(RCP 值)为 468.79308 J·kg-1(0～7 T);绝热温度(△Tad)分别为 4.21 K、4.30 K、4.51 K、4.96 K.母相 Pr0.87Ca0.13MnO3 样品和 Pr0.82Dyu.05Ca0.13MnO3 样品经历的是二级相变,Pr0.77Dy0.1Ca0.13MnO3样品和Pr0.72Dy0.15Ca0.13MnO3样品经历的是一级相变;利用不同的模型对样品进行拟合和Kouvel-Fisher(K-F)方法来计算临界指数,最终得出该组样品的相变临界行为为平均场模型;该组样品中均存在磁晶各向异性和反铁磁的成分.
Study on the Magnetothermal Effect and Critical Behavior of Dy Doped Pr0.87Ca0.13MnO3 System
Perovskite structure metal oxides show rich magnetic properties,and the regulation of magnetic properties by A-site doping is also an important direction in the study of perovskite structure metal oxides.In this paper,Pr(0.87-x)DyxCa0.13MnO3(x=0,0.05,0.1,0.15)series polycrystalline samples were produced by high temperature solid phase reaction method.The influence of doping amount of Dy3+on crystal structure,magnetothermal effect and critical behavior of parent Pr0.87Ca0.13MnO3 were studied.The Pr(0.87.x)DyxCa0.13MnO3(x=0,0.05,0.1,0.15)series samples have good crystallinity and high purity,and the spatial point group is orthorhombic system Pnma,which belongs to cubic structure.The Refrigeration ca-pacities of Pr0.82Dy0.05Ca0.13MnO3 are 114.73 J·kg-1(0～3 T),222.92 J·kg-1(0～5 T)and 351.88 J·kg-1(0～7 T),and Pr0.82Dy0.05Ca0.13MnO3 may be an excellent magnetic refrigeration material.The Relative refrigeration capacity was 468.79308 J·kg-1(0～7 T),and the adiabatic temperatures(△Tod)were 4.21 K,4.30 K,4.51 K and 4.96 K,respectively.The par-ent phase Pr0.87Ca0.13MnO3 and Pr0.82Dy0.05Ca0.13MnO3 samples undergo second-order phase transition while they undergo first-order phase transition.Through fitting Arrott curves of samples by using different models and calculating the critical index with Kouvel-Fisher(K-F)method,it is concluded that the critical behavior of this group of samples is the mean field model.There are magnetic crystal anisotropy and antiferromagnetic components in the samples.

perovskite manganese oxidehigh temperature solid phase reaction methodmagnetothermal effectcritical behaviorrare earth

郝志军、赵建军、云慧琴、赵晶、邢婷、马怀瑾、王雁冰

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包头师范学院物理科学与技术学院,内蒙古 包头 014030

内蒙古中环晶体材料有限公司,内蒙古 呼和浩特 010020

内蒙古自治区高等学校磁学与磁性材料重点实验室,内蒙古 包头 014030

钙钛矿锰氧化物 高温固相反应法 磁热效应 临界行为 稀土

国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目内蒙古自治区研究生科研创新项目高水平研究成果培育项目自然科学类青年项目专业认证下的近代物理实验教学改革与探索

111640195156203261565013S20210179ZBSYKJ2021-ZQ08BSJG22Y14

2024

10.16533/J.CNKI.15-1099/TF20240016

稀土
中国稀土学会 包头稀土研究院

稀土

CSTPCD北大核心
影响因子：1.172
ISSN：1004-0277
年,卷(期)：2024.45(3)
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