期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
Dy掺杂对(La1-xDyx)2/3（Sr）1/3MnO3居里温度和磁熵变的影响
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1. 河北师范大学物理科学与信息工程学院, 河北石家庄050016;
2. 河北工业职业技术学院信息工程与自动化系, 河北石家庄050091 -
DOI：
Inflence of Dy3+ Doping on the Curie Temperature andMagnetic Entropy Change in (La1-xDyx)2/3（Sr）1/3MnO3Perovskite
摘要/Abstract
用固相反应法制备了(La1-xDyx)2/3（Sr）1/3MnO3(x=0∼0.20).X射线衍射分析表明,样品为单相钙钛矿菱面结构,不存在其他杂相.扫描电镜照片显示样品的颗粒均匀,平均粒径分布在200∼300 nm之间.利用振动样品磁强计测量了样品的M-T曲线和居里温度附近的等温M-H曲线,研究了样品的居里温度和磁熵变随Dy掺杂量的变化规律.结果表明,随着Dy掺杂量的增加,系列样品的居里温度降低,磁熵变先增大后减小,在x=0.05处达到最大.
Polycrystallin samples of (La1-xDyx)2/3(Sr)1/3MnO3 are prepared by convent ional soild-state reaction method.Analysis of the X-ray diffract ion showed that the samples in this work were of the single perovskite-type phase with Rhombohedral structure.The scanning electron microscope observ ations show that all samples studied in this paper were const ituted of homog eneous particles with a narrow part icle-size dist ribution,ranging from 200to300nm.The M-T curves and isothermal M-H curves near Tc were measured by using a vibrating sample magnetometer. The Curie temperature and the magnetic entropy change of the samples are studied based on the magnetic measurements.It was found that the Curie temperature Tc decreases with increasing x and the magnetic entropy change |ΔSM| has a max imum at x=0.05.