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材料研究学报  2004, Vol. 18 Issue (3): 333-336    
  论文 本期目录 | 过刊浏览 |
La{0.67-x}Ca{0.33}MnO{3}系列样品的磁热效应
侯登录;白云;徐静;唐贵德
河北师范大学
Magnetocaloric effect of La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$
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河北师范大学
引用本文:

侯登录; 白云; 徐静; 唐贵德 . La{0.67-x}Ca{0.33}MnO{3}系列样品的磁热效应[J]. 材料研究学报, 2004, 18(3): 333-336.
, , , . Magnetocaloric effect of La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$[J]. Chin J Mater Res, 2004, 18(3): 333-336.

全文: PDF(1286 KB)  
摘要: 用溶胶--凝胶法制备了不同空位浓度掺杂的La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$ 系列样品($x$=0.00, 0.02, 0.06, 0.10), 用扫描电子显微镜(SEM)观察了样品的形态和颗粒大小, X射线衍射实验结果显示样品为单相钙钛矿结构, 用振动样品磁强计(VSM)测量了样品的磁化强度随温度变化的$M$--$T$ 曲线和起始磁化$M$--$H$曲线. 研究了空位浓度对样品的居里温度$T_{\rm c}$和磁熵变的影响. 结果表明, 空位浓度的掺杂将样品的居里温度$T_{\rm c}$提高至室温附近, 磁熵变得到增强. 对于经历了一级相变的样品La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$ ($x$=0.02), 在居里温度$T_{\rm c}$(277 K)附近和1 T外磁场下, 最大磁熵变达到了2.78 J/(kg$\cdot$K).
关键词 无机非金属材料锰钙钛矿磁致冷磁热效应    
Abstract:Polycrystalline samples of La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$ ($x$=0.00, 0.02, 0.06, and 0.10) with different vacancies in La$^{3+}$--site were prepared by sol--gel method. The grain sizes of samples were observed by SEM. XRD results show that the samples are single phase of perovskite--type oxides. The Curie temperatures and the magnetic entropy change of the samples were studied by VSM. The influence of the vacancy concentration in La$^{3+}$--site on their magnetocaloric properties has been investigated. The higher Curie temperatures close to room temperature and the larger magnetic entropy changes have been observed. The maximum magnetic entropy change, 2.78 J/(kg$\cdot$K), is obtained near its Curie temperature (277 K) under the field of 1 T for La$_{0.67-x}$Ca$_{0.33}$MnO$_{3}$ ($x$=0.02) sample.
Key wordsinorganic non-metallic materials    perovskite-type manganese oxides    magnetic refrigerant    magnetocalori
收稿日期: 2004-07-19     
ZTFLH:  TB64  
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