烧结温度对La0.67Ca0.33-xSrxMnO3结构及电学性能的影响

doi:10.15541/jim20160025

摘要/Abstract

摘要：

采用传统固相反应法合成了双掺杂La_0.67Ca_0.33-_xSr_xMnO₃(x=0, 0.05, 0.15)粉体, 研究了烧结温度对La_0.67Ca_0.33-_xSr_xMnO₃(x=0, 0.05, 0.15)结构、微观形貌和金属-绝缘体相转变温度的影响规律。结果表明: 烧结温度的升高对微观形貌及结构影响较小, 双掺杂有效改善了材料体系的相转变温度。当烧结温度为1400℃, 掺杂量x=0增加至x=0.05时, 材料体系为正交相, 相转变温度从-20℃升高至6℃。掺杂量继续增加至x=0.15, 材料体系从正交相转变为六方相, 相转变温度升高至17℃。当掺杂量相同时, 相转变温度随烧结温度的升高而升高。具有上述智能相变特性的材料体系可以作为长寿命卫星主动热控技术的重要候选材料。

关键词: La0.67Ca0.33-xSrxMnO3陶瓷, 烧结温度, 相转变温度

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

中图分类号:

TQ174

孙淑苗, 于洋, 米乐, 于云, 曹韫真, 宋力昕. 烧结温度对La_0.67Ca_0.33-xSr_xMnO₃结构及电学性能的影响[J]. 无机材料学报, 2016, 31(9): 943-947.

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.

图/表 5

图1 La0.67Ca0.33-xSrxMnO3(x=0、0.05、0.15)粉体的XRD图谱(a)及其放大图谱(b)

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

图2 不同温度烧结La0.67Ca0.33-xSrxMnO3陶瓷的XRD图谱

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

图3 不同温度烧结12 h得到的La0.67Ca0.33-xSrxMnO3的SEM照片

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

图4 不同温度烧结12 h得到的La0.67Ca0.33-xSrxMnO3的电阻-温度曲线

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

表1 不同温度烧结的La0.67Ca0.33-xSrxMnO3 (x=0、0.05、0.15)的金属-绝缘体相转变温度

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

参考文献 19

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烧结温度对La_0.67Ca_0.33-xSr_xMnO₃结构及电学性能的影响

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

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