期刊
CERAMICS INTERNATIONAL
卷 46, 期 8, 页码 10598-10602出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.01.063
关键词
La0.5Ca0.5MnO3; A-site disordering; Magnetoresistance; Jahn-Teller distortion
资金
- National Natural Science Foundation of China [11404091]
- Natural Science Foundation of Jiangsu Province [BK20140839]
La0.5-xDyxCa0.5-ySryMnO3 (X = 0, 0.05, 0.08, 0.1, 0.14, 0.16, 0.2) polycrystalline samples were prepared by hightemperature solid-state reaction. The A-site disordering is increased with the doping concentration x, and meanwhile the average ionic radius of A-site is kept constant. X-ray diffraction and Raman spectroscopy were combined to investigate the microstructural distortion of MnO6 octahedron. Results show that the rotational vibration (RV) is the dominant distortion mode. With the A-site disordering increasing, RV mode is obviously hardened, and the Jahn-Teller distortion is enhanced. Properties investigation shows that the insulation is strengthened because of FM double exchange effect suppressed with A-site disordering increasing, and the magnetoresistance effect is weakened. A relatively significant magnetoresistance effect was observed in the low temperature region for the high-doped concentration sample, which may be related to the strong magnetic moment of Dy3+.
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