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| INFLUENCE OF La DOPING ON THE STRUCTURE,MAGNETIC AND ELECTRICAL TRANSPORT PROPERTIES OF Pr0.75Na0.25MnO3 |
| ZHANG Xinghua; LI Zhiqing; JIANG Enyong |
| 天津大学理学院应用物理系 |
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Cite this article:
ZHANG Xinghua; LI Zhiqing; JIANG Enyong. INFLUENCE OF La DOPING ON THE STRUCTURE,MAGNETIC AND ELECTRICAL TRANSPORT PROPERTIES OF Pr0.75Na0.25MnO3. Acta Metall Sin, 2006, 42(9): 974-978 .
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Abstract Polycrystalline (Pr 1-x La x)0.75Na0.25MnO3 (0.00≤x≤1.00) manganites were prepared by sol-gel method. X-ray Diffraction patterns showed that the samples are crystallized in single phase with perovskite-like structure. The structure of the compounds transforms from orthorhombic structure for x≤0.50 to rhombohedral structure for x≥0.70. The introduction of La3+ ions also suppresses the charge ordering in the samples. The charge ordering transition temperature decreases with increasing La3+ doping when x≤0.10. The charge ordering phenomenon disappeared for the samples with x＞0.10, paramagnetic-ferromagnetic transition appeared, while the insulator-metal transition can be observed. For x≥0.50, the compounds also show large magnetic entropy change under low field near or above room temperature, indicating the material can be used in magnetic refrigeration.
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Received: 08 December 2005
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