Study on Molding and Performance for Nanometer La0.8Sr0.2MnO3 Massive Material under High

doi:10.3724/SP.J.1077.2010.00473

Abstract

Abstract:

The La_0.8Sr_0.2MnO₃massive samples were prepared with crystal grain size about 30nm under high pressure . The structure, grain size and morphology of the samples were characterized by Xray diffraction (XRD) and field emission scanning electron microscope(FESEM). Raman spectra of the samples was carried out by microRaman spectrometer in the range of 100-3000cm-1 with the laser power of 400mW. The results showed that the grain evolution of La_0.8Sr_0.2MnO₃was influenced by temperature and pressure. When the agglomeration temperature was below 300℃, the grain growth rate increased with increasing pressure at the sintering pressure of 1-3GPa while it fell down as pressure rised continuously at the sintering pressure of 4-5GPa. The grain growth rate increased with increment of pressure when the agglomeration temperature was over 300℃. Physical properties of agglomeration samples synthesized under high pressure were studied. Experimental results indicated that the microhardness of samples increased obviously after high pressure agglomeration. When sintering temperature was 300℃, the resistivity of samples decreased firstly then increased with increment of pressure. The sample prepared under 5GPa at 300℃ had obviously ferromagnetic character at room temperature.

Key words: high pressure, La_0.8Sr_0.2MnO₃nano-material, performance

CLC Number:

TG146
O611

HUANG Hao-1, SHAO Guang-Jie-2, HU Jie-1, 2. Study on Molding and Performance for Nanometer La_0.8Sr_0.2MnO₃Massive Material under High[J]. Journal of Inorganic Materials, 2010, 25(5): 473-479.

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Study on Molding and Performance for Nanometer La_0.8Sr_0.2MnO₃Massive Material under High

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