Co掺杂钙钛矿锰氧化物La0.8Sr0.2MnO3电磁特性研究

doi:10.15541/jim20180047

无机材料学报 ›› 2018, Vol. 33 ›› Issue (11): 1237-1247.DOI: 10.15541/jim20180047 CSTR: 32189.14.10.15541/jim20180047

Co掺杂钙钛矿锰氧化物La_0.8Sr_0.2MnO₃电磁特性研究

刘娇¹, 王文清^1,2, 吴鸿业^1,2, 田野¹, 曹凤泽¹, 赵建军^1,2

包头师范学院 1. 物理科学与技术学院;
2. 内蒙古自治区磁学与磁性材料重点实验室包头 014030

收稿日期:2018-01-29 修回日期:2018-05-23 出版日期:2018-11-16 网络出版日期:2018-10-20
作者简介:刘娇(1995-), 女, 硕士研究生. E-mail: 907156479@qq.com
基金资助:
国家自然科学基金(11164019, 51562032, 61565013);内蒙古自治区科学基金(2015MS0109, NJZZ11166, NJZY12202, NJZY16237);包头市科学技术局产学研合作项目(2014X1014-01, 2015Z2011);内蒙古自治区研究生科研创新项目(S201710127(S01))

Electromagnetic Property of Co-doped La_0.8Sr_0.2MnO₃ Perovskite Manganese Oxides

LIU Jiao¹, WANG Wen-Qing^1,2, WU Hong-Ye^1,2, TIAN Ye¹, CAO Feng-Ze¹, ZHAO Jian-Jun^1,2

1. Department of Physics, Baotou Normal University, Baotou 014030, China;
2. Inner Mongolia Key Laboratory of Magnetism and Magnetic Materials, Baotou Normal University, Baotou 014030, China

Received:2018-01-29 Revised:2018-05-23 Published:2018-11-16 Online:2018-10-20
About author:LIU Jiao. E-mail: 907156479@qq.com
Supported by:
National Natural Science Foundation of China (11164019, 51562032, 61565013);Inner Mongolia Natural Science Foundation (2015MS0109, NJZZ11166, NJZY12202, NJZY16237);Science and Technology in Baotou Production- Study-Research Cooperation Projects, China (2014X1014-01, 2015Z2011);Inner Mongolia Autonomous Region Graduate Research and Innovation Project (S201710127(S01))

摘要/Abstract

摘要：

采用传统的高温固相反应法制备了La_0.8Sr_0.2Mn_1-_xCo_xO₃(x = 0, 0.1, 0.3)多晶样品。系统研究了Co掺杂量对La_0.8Sr_0.2MnO₃(LSMO)多晶样品的类Griffiths相、磁熵变、临界行为和电输运性质的影响。研究结果表明: 制备的多晶样品均具有菱形对称结构; 三样品在低温磁转变温度(T_C2)以上均存在类Griffiths相; La_0.8Sr_0.2Mn_1-_xCo_xO₃(x = 0, 0.1, 0.3)样品外加磁场为7 T的最大磁熵变ΔS_max分别为-2.28、-2.05和-2.75 J/(kg·K), Co元素的掺杂使得ΔS_max先减小后增大; 母相的临界行为与平均场模型拟合得最好, 掺杂后样品的临界行为和3D海森伯模型拟合最好; 母相为半导体材料, Co元素掺杂量达到0.1时在低温磁转变温度(T_C2)附近出现金属绝缘体转变; 高温区三样品的导电方式均满足小极化子模型。

关键词: 钙钛矿锰氧化物, 类Griffiths相, 临界指数, 电性

Abstract:

La_0.8Sr_0.2Mn_1-_xCo_xO₃(x = 0, 0.1, 0.3) samples were prepared via the conventional high-temperature solid-state reaction method. The effects of Co doping on Griffiths phase, magnetic entropy change, critical behavior, and electrical transport properties of La_0.8Sr_0.2MnO₃ (LSMO) polycrystalline samples were systematically investigated. Results show that the prepared polycrystalline samples all have rhombohedral symmetry structures with Griffiths phase above the low temperature magnetic transition temperature (T_C2). When magnetic field is applied to the La_0.8Sr_0.2Mn_1-_xCo_xO₃ (x = 0, 0.1, 0.3) samples, the maximum magnetic entropy change ΔS_max for 7 T is -2.88, -2.05, and -2.75 J/(kg·K), respectively. Doping of Co element makes ΔS_maxdecrease first and then increase. The critical behavior of the parent phase fits best with the mean field model, and that of the sample after doping fits best with the 3D Heisenberg model. The mother phase is a semiconductor material, and the metal insulator transition appears near the low temperature magnetic transition temperature (T_C2) when the Co element doping amount reaches 0.1. The conductivity of the three samples in high temperature region satisfies the small polaron model.

Key words: perovskite manganese oxide, Griffiths-like phase, critical exponent, electrical (electrical property)

中图分类号:

TQ174

刘娇, 王文清, 吴鸿业, 田野, 曹凤泽, 赵建军. Co掺杂钙钛矿锰氧化物La_0.8Sr_0.2MnO₃电磁特性研究[J]. 无机材料学报, 2018, 33(11): 1237-1247.

LIU Jiao, WANG Wen-Qing, WU Hong-Ye, TIAN Ye, CAO Feng-Ze, ZHAO Jian-Jun. Electromagnetic Property of Co-doped La_0.8Sr_0.2MnO₃ Perovskite Manganese Oxides[J]. Journal of Inorganic Materials, 2018, 33(11): 1237-1247.

图/表 12

图1 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品的XRD图谱

Fig. 1 XRD patterns of La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3) samples

表1 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品的晶格参数和晶胞体积

Table 1 Lattice parameters and cell volume of La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1 and 0.3) samples

Sample	a/nm	b/nm	V/nm³	c/nm
x=0	0.550993	0.5522	0.2032339	0.667965
x=0.1	0.551356	0.551354	0.2028696	0.667351
x=0.3	5.49571	5.49557	201.3505	6.66678

图2 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品在0.01 T磁场下的M-T曲线(a)~(c)和χT-T曲线(d)~(f), 插图为对应的dMFC/dT-T曲线

Fig. 2 M-T curves (a)~(c) and χT-T curves(d)~(f) for the La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3) samples at 0.01T magnetic field with the insets showing the corresponding dMFC/dT-T curves

图3 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品在0.01 T磁场下的Mirr-T曲线

Fig. 3 Mirr-T curves of La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3) samples at 0.01 T applied magnetic field

图4 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品在0.01 T磁场下χ-1-T曲线, 插图为0.01 T下的lgχ-1-lgtm曲线, 其中tm=(T-TC)/TC

Fig. 4 χ-1-T curves of the La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3) samples under a 0.01T magnetic field with the insets showing the lgχ-1 -lgtm curves at 0.01T, where tm=(T-TC)/TC

图5 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品在不同温度下磁化强度随外加磁场变化的M-H曲线(a)~(c)和等温Arrott曲线(H/M-M2)(d)~(f)

Fig. 5 M-H curves((a-c)) and isothermal Arrott curves ((d)~(f), H/M versus M2) of the magnetization of samples La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3) varying with the applied magnetic field at different temperatures

图6 La0.8Sr0.2MnO3(A)、La0.8Sr0.2Mn0.9Co0.1O3(B)和La0.8Sr0.2Mn0.7Co0.3O3(C)样品和平均场模型、3D海森伯模型、3D伊辛模型以及三临界模型的拟合图

Fig. 6 Fitting of La0.8Sr0.2MnO3(A), La0.8Sr0.2Mn0.9Co0.1O3(B) and La0.8Sr0.2Mn0.7Co0.3O3(C) sample curves to mean field, 3D-Heisenberg, 3D-Ising, and tricritical models

图7 La0.8Sr0.2MnO3(A)、La0.8Sr0.2Mn0.9Co0.1O3(B)和La0.8Sr0.2Mn0.7Co0.3O3(C)样品在居里温度以下自发磁化强度随温度的变化曲线MS-T(a)和MS (dMs/dT)-1-T(b)曲线 La0.8Sr0.2Mn0.7Co0.3O3样品在居里温度下零场磁化率倒数随温度的变化曲线χ0-1-T(c)和χ0-1 (dχ0-1/dT)-1-T曲线(d); 插图为相对应的Arrott-Plot

Fig. 7 Curves of spontaneous magnetization at temperatures below the Curie temperature for La0.8Sr0.2MnO3(A), La0.8Sr0.2Mn0.9Co0.1O3(B) and La0.8Sr0.2Mn0.7Co0.3O3(C) sample versus temperature MS-T (a), MS (dMs/dT)-1-T and their fitted straight lines (b); Curves of zero-field susceptibility reciprocal at temperatures above the Curie temperature for La0.8Sr0.2Mn0.7Co0.3O3 sample versus temperature χ0-1-T (c), χ0-1 (dχ0-1/dT)-1-T and their fitted straight lines(d); The illustrations are for the corresponding Arrott-Plot

图8 La0.8Sr0.2Mn1-xCoxO3(x=0 (a), 0.1 (b), 0.3 (c))样品分别在108~278 K、100~300 K和110~285 K的等磁场下磁熵变随温度的变化曲线(-ΔS-T)

Fig. 8 Curves of magnetic entropy change with temperature for the samples La0.8Sr0.2Mn1-xCoxO3 (x = 0 (a), 0.1 (b), 0.3 (c)) under the same magnetic field of 108~278 K, 100~300 K and 110~285 K, respectively (-ΔS-T)

图9 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品电阻率随温度的变化曲线

Fig. 9 Resistivity of samples La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3) versus temperature

图10 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品在外加磁场为2 T时, 磁电阻随温度的变化曲线(MR-T)

Fig. 10 Change of magnetoresistance with temperature (MR-T) at 2 T for La0.8Sr0.2Mn1-xCoxO3 (x = 0, 0.1, 0.3)

图11 La0.8Sr0.2Mn1-xCoxO3(x=0, 0.1, 0.3)样品的模型拟合线(lnρ-T-1), (ln(ρ/T)-T-1)和(lnρ-T-1/4)曲线

Fig. 11 Model fitting curves of La0.8Sr0.2Mn1-xCoxO3 (x=0, 0.1, 0.3), (ln(ρ-T-1), (ln(ρ/T)-T-1)and (lnρ-T-1/4) curves

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Co掺杂钙钛矿锰氧化物La_0.8Sr_0.2MnO₃电磁特性研究

Electromagnetic Property of Co-doped La_0.8Sr_0.2MnO₃ Perovskite Manganese Oxides

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