| 학회 |
한국재료학회 |
| 학술대회 |
2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 |
21권 2호 |
| 발표분야 |
C. 에너지 재료 |
| 제목 |
Novel Immittance Spectroscopy for Polymorphic Scandium NASICON |
| 초록 |
Conductivity and calorimetric measurements of Sc NASICON analog Na3Sc2(PO4)3 suggest polymorphic phase transitions driven by sodium ion disorder. Apparent two-arc impedance response of low temperature monoclinic phase is successfully described by the parallel connection of two Havriliak-Negami dielectric functions with negative skewnesses for the bulk dispersion due to the mobile charge carriers, and the current-constriction polarization, respectively. The time constants indicate the associated bulk conduction mechanism and the capacitance strengths mobile charge carrier concentrations and the effective dipole distances. They are further connected in parallel to the total sample resistance and geometric capacitance. The approach is in line with the textbook polarization theory, where all the polarization mechanisms with different relaxation times including those from the space charges along the grain boundaries are added. 14 model parameters competently simulate the AC behavior over a wide temperature and frequency range. |
| 저자 |
Jong-Sook Lee, Won Bin Im, Eui-Chol Shin, Dong-Chun Cho, Yoon Hwa Kim, Su-Hyun Moon
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| 소속 |
전남대 |
| 키워드 |
Na<SUB>3</SUB>Sc<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>; phase transitions; universal dispersive response; current constriction; Havriliak-Negami dielectric functions; dielectric spectroscopy<P> </P>
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| E-Mail |
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