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MgO 첨가에 따른 La0.7Sr0.3-xMgxMnO3 세라믹스의 구조적, 전기적 특성Structural and Electrical Properties of La0.7Sr0.3-xMgxMnO3 Ceramics with MgO Content
- Other Titles
- Structural and Electrical Properties of La0.7Sr0.3-xMgxMnO3 Ceramics with MgO Content
- Issue Date
- May-2023
- Publisher
- 한국전기전자재료학회
- Keywords
- (La; Sr)MnO3; Thermistor; Structural properties; Electrical properties; B-value; Temperature of coefficient of resistance
- Citation
- 전기전자재료학회논문지, v.36, no.3, pp 275 - 279
- Pages
- 5
- Indexed
- KCI
- Journal Title
- 전기전자재료학회논문지
- Volume
- 36
- Number
- 3
- Start Page
- 275
- End Page
- 279
- ISSN
- 1226-7945
2288-3258
- Abstract
- La0.7Sr0.3-xMgxMnO3 (LSMMO) (x=0.05~0.20) specimens are fabricated by a solid phase sintering method, and the sintering temperature and time are 1,300℃ and 2 hours, respectively. The dependence of the crystalline structure according to the amount of Mg2+ contents is not observed, and all specimens show a polycrystalline rhombohedral crystal structure, the Xray diffraction (110) peaks move to the high angle side with increasing the amount of Mg2+ contents. LSMMO specimens exhibit a granule-shaped microstructure with an average grain size of 1 μm or less. Resistivity gradually decrease as the amount of Mg2+ contents increased. And in the La0.7Sr0.1Mg0.2MnO3 specimen, resistivity and B25/65-value are 36.7 Ω-cm and 394 K at room temperature, respectively. LSMMO specimens show a variable-range hopping (VRH) electrical conduction mechanism, and the negative temperature of coefficient of resistance (NTCR) is approximately 0.37~0.38%/℃.
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