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Ba0.5Bi0.5FeO3 ceramic was fabricated by conventional solid-state reaction method. The microstructures and electrical properties were characterized by X-ray diffraction, scanning electron microscopy, direct current (DC) resistance-temperature measurement and alternative current (AC) impedance analysis. According to the analysis, Ba0.5Bi0.5FeO3 ceramic is a cubic perovskite-type compound, and its grain size is about 1.0 μm. In the measured temperature range of 16—280 ℃, Ba0.5Bi0.5FeO3 ceramic shows obvious negative temperature coefficient thermistor characteristic, and the thermistor constant and activation energy of the ceramic are 6490 K and 0.558 eV, respectively. The temperature dependence of dielectric constant reveals that below 280 ℃ no phase transition occurs. The AC impedance characteristic in the ceramic can appropriately be modeled in terms of an equivalent electrical circuit comprising of a series combination of three parallel RQ components in connection with the grain, grain shell and grain boundary effects. The fitting results are in good agreement with the experimental data. The components of grain, grain shell and grain boundary, showing NTC characteristic, have the order of resistive contribution of Rg>Rs>Rgb. In the temperature range 25—115 ℃, the significant mismatch between the peaks of parameters Z″(ω) (imaginary part of impedance) and M″(ω) (imaginary part of electric modulus) suggests a development of persistent localized conduction in Ba0.5Bi0.5FeO3 ceramic.
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Keywords:
- Bi0.5Ba0.5FeO3 ceramic /
- electrical properties /
- impedance analysis
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[2] Smolenskii G A, Yudin V M, 1963 Sov. Phys. JETP 16 622
[3] Smolenskii G, Isupov V, Agranovskaya A, Kranik N 1961 Sov. Phys. Solid State 2 2651.
[4] Zhang H, Liu F M, Ding F, Zhong W W, Zhou C C 2010 Acta Phys. Sin. 59 2078 (in Chinese)[张 嬛、刘发民、丁 凡、钟文武、周传仓 2010 59 2078]
[5] Sun Y, Huang Z F, Fan H G, Ming X, Wang C Z, Chen G 2009 Acta Phys. Sin. 58 193 (in Chinese) [孙 源、黄祖飞、范厚刚、明 星、王春忠、陈 岗 2009 58 193]
[6] Das S R, Choudhary R N P, Bhattacharya P, Katiyar R S, Dutta P, Manivannan A, Seehra M S 2007 J. Appl. Phys. 101 034104
[7] Bellakki M B, Manivannan V, Madhu C, Sundaresan A 2009 Mater. Chem. Phys.116 599
[8] Sahu J R, Rao C N R 2007 Solid-State Sci. 9 950
[9] Uniyal P, Yadav K L 2008 Mater. Lett. 62 2858
[10] Luo B C, Zhou C C, Chen C L, Jin K X 2009 Acta Phys. Sin. 58 4563 (in Chinese) [罗炳成、周超超、陈长乐、金克新 2009 58 4563]
[11] Balamurugan K, Harish Kumar N, Santhos P N 2009 J. Appl. Phys. 105 07D909
[12] Yuan C L, Liu X Y, Ma J F, Zhou C R 2010 Acta Phys. Sin. 59 321 (in Chinese) [袁昌来、刘心宇、马家峰、周昌荣 2010 59 321]
[13] Fau P, Bonino J P, Demai J J, Rousset J 1993 Appl. Surf. Sci. 65—66 319
[14] Macklen E D 1979 Thermistors (Ayr, Scotland:Electrochemical Publications Ltd.) p33
[15] Larson E G, Arnott R J, Wikham D G 1962 J. Phys. Chem. Solid 23 1771
[16] Cao W, Gerhardt R 1990 Solid State Ionics 42 213
[17] Gerhardt R 1994 J. Phys. Chem. Solids 55 1491
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[1] Fischer P, Polomska M, Sosnowska I, Szymański M 1980 J. Phys. C 13 1931.
[2] Smolenskii G A, Yudin V M, 1963 Sov. Phys. JETP 16 622
[3] Smolenskii G, Isupov V, Agranovskaya A, Kranik N 1961 Sov. Phys. Solid State 2 2651.
[4] Zhang H, Liu F M, Ding F, Zhong W W, Zhou C C 2010 Acta Phys. Sin. 59 2078 (in Chinese)[张 嬛、刘发民、丁 凡、钟文武、周传仓 2010 59 2078]
[5] Sun Y, Huang Z F, Fan H G, Ming X, Wang C Z, Chen G 2009 Acta Phys. Sin. 58 193 (in Chinese) [孙 源、黄祖飞、范厚刚、明 星、王春忠、陈 岗 2009 58 193]
[6] Das S R, Choudhary R N P, Bhattacharya P, Katiyar R S, Dutta P, Manivannan A, Seehra M S 2007 J. Appl. Phys. 101 034104
[7] Bellakki M B, Manivannan V, Madhu C, Sundaresan A 2009 Mater. Chem. Phys.116 599
[8] Sahu J R, Rao C N R 2007 Solid-State Sci. 9 950
[9] Uniyal P, Yadav K L 2008 Mater. Lett. 62 2858
[10] Luo B C, Zhou C C, Chen C L, Jin K X 2009 Acta Phys. Sin. 58 4563 (in Chinese) [罗炳成、周超超、陈长乐、金克新 2009 58 4563]
[11] Balamurugan K, Harish Kumar N, Santhos P N 2009 J. Appl. Phys. 105 07D909
[12] Yuan C L, Liu X Y, Ma J F, Zhou C R 2010 Acta Phys. Sin. 59 321 (in Chinese) [袁昌来、刘心宇、马家峰、周昌荣 2010 59 321]
[13] Fau P, Bonino J P, Demai J J, Rousset J 1993 Appl. Surf. Sci. 65—66 319
[14] Macklen E D 1979 Thermistors (Ayr, Scotland:Electrochemical Publications Ltd.) p33
[15] Larson E G, Arnott R J, Wikham D G 1962 J. Phys. Chem. Solid 23 1771
[16] Cao W, Gerhardt R 1990 Solid State Ionics 42 213
[17] Gerhardt R 1994 J. Phys. Chem. Solids 55 1491
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