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学科主题: Engineering ; Materials Science ; Physics
题名:
Effect of CaO-doped in NiMn2O4-LaMnO3 composite ceramics on microstructure and electrical properties
作者: Guan Fang; Zhang Huimin; Chang Aimin; Zhao Pengjun; Zhang Bo
通讯作者: Chang, A.
刊名: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
发表日期: 2012
DOI: 10.1007/s10854-012-0654-4
卷: 23, 期:9, 页:1728-1733
英文摘要:

The composite ceramics (NiMn2O4)(0.50)(La1-x Ca (x) MnO3)(0.50) (0 a parts per thousand currency sign x a parts per thousand currency sign 0.3) consisting of spinel-structured NiMn2O4 and perovskite-structured CaO-doped LaMnO3 were prepared by classical solid state reaction. The X-ray diffraction (XRD) patterns have shown that the major phases presented in the sintered samples are NiMn2O4 compounds with a spinel structure, La1-x Ca (x) MnO3 with a perovskite structure. The Scanning Electron Microscope (SEM) pictures have exhibited that the grain size of the composite ceramics decreases from ca. 6.5 to 2.0 mu m as the mole fraction of CaO increases from 0 to 0.3. The rho (25 A degrees C) and B (25/50) constants of the composite samples are in the range of 0.234-8.61 Omega cm and 2,600-2,962 K, respectively. In particular, CaO-doped leads to a decrease in the resistance drift of the (NiMn2O4)(0.50)(La1-x Ca (x) MnO3)(0.50) composite NTC (negative temperature coefficient) ceramics after aging test. This indicates that the CaO-doped (NiMn2O4)(0.50)(La1-x Ca (x) MnO3)(0.50) NTC ceramics display high electrical stability in comparison with the Ca-free (NiMn2O4)(0.50)(LaMnO3)(0.50) ceramics. The X-ray photoelectron spectroscopy (XPS) analysis verifies that the valence states of the manganese ions have a highly mixed state of Mn2+, Mn3+ and Mn4+ at B site. And the electrical conduction of the composite ceramics can be elaborated by the ions migration mechanism.

WOS记录号: WOS:000307290400018
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/1363
Appears in Collections:新疆维吾尔自治区电子信息材料与器件重点实验室_期刊论文

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作者单位: Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China;Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

Recommended Citation:
Guan Fang,Zhang Huimin,Chang Aimin,et al. Effect of CaO-doped in NiMn2O4-LaMnO3 composite ceramics on microstructure and electrical properties[J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,2012-01-01,23(9):1728-1733.
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