Effect of Sintering Temperature on Structure and Electric Performance of La0.67Ca0.33-xSrxMnO3 Ceramic

doi:10.15541/jim20160025

Abstract

Abstract:

Double-doped La_0.67Ca_0.33-_xSr_xMnO₃(x=0, 0.05, 0.15) powders were synthesized by traditional solid-state reaction method. Effects of sintering temperature on structure, micro morphology and metal-insulator phase transition temperature of La_0.67Ca_0.33-_xSr_xMnO₃ ceramic were systemically studied. The results showed that sintering temperature had little influence on crystallinity or micro morphology of as-prepared ceramic, while double-doping effectively changed the phase transition temperature of the ceramics. When the ceramics sintered at 1400℃, the metal-insulator phase transition temperature increased from -20℃ to 6℃ and the ceramics stabilized in orthorhombic structure as the doping level varing from x=0 to x=0.05. At the doping level x=0.15, the crystal structure changed from rhombohedral to orthorhombic and the metal-insulator transition temperature was 17℃. Under the same doping concentration, the metal-insulator phase transition temperature of the ceramics increased with the increase of sintering temperature. The above mentioned material may be an ideal candidate for active thermal control technology of long life satellites.

Key words: La0.67Ca0.33-xSrxMnO3 ceramic, sintering temperature, The metal-insulator phase transition temperature

CLC Number:

TQ174

SUN Shu-Miao, YU Yang, MI Le, YU Yun, CAO Yun-Zhen, SONG Li-Xin. Effect of Sintering Temperature on Structure and Electric Performance of La_0.67Ca_0.33-_xSr_xMnO₃ Ceramic[J]. Journal of Inorganic Materials, 2016, 31(9): 943-947.

Figures/Tables 5

Fig. 1 (a) XRD patterns and (b) enlarged XRD patterns of La0.67Ca0.33-xSrxMnO3(x=0, 0.05, 0.15) powders

Fig. 2 XRD patterns of La0.67Ca0.33-xSrxMnO3 ceramic sintered at different temperatures(a) x=0; (b) x=0.05; (c) x=0.15

Fig. 3 SEM images of La0.67Ca0.33-xSrxMnO3 sintered at different temperatures for 12 h(a) x=0; (b) x=0.05; (c) x=0.15

Fig. 4 Electrical resistance versus temperature of La0.67Ca0.33-x SrxMnO3 sintered at different temperatures for 12 h(a)x=0; (b) x=0.05; (c) x=0.15

Table 1 The metal-insulator transition temperatures of La0.67Ca0.33-xSrxMnO3 (x=0, 0.05, 0.15) sintered at different temperatures

Temperature/℃	1350	1400	1450	1480	1500	1530
La_0.67Ca_0.33MnO₃	-22	-20	-17	-16	-13	-12
La_0.67Ca_0.28Sr_0.05MnO₃	5	6	9	12	14	15
La_0.67Ca_0.18Sr_0.15MnO₃	15	17	20	21	22	24

References 19

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Effect of Sintering Temperature on Structure and Electric Performance of La_0.67Ca_0.33-_xSr_xMnO₃ Ceramic

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