Effect of Defect Characteristics on the Color of BaTiO₃-Based PTC Ceramic

Abstract:

The barium titanium based PTC ceramic with two kind of colors, light blue and yellow, were obtained by changing sintering processing. In order to reveal the relationship between color and electrical properties of the ceramics. The phase structure and microstructure of as synthesized samples were investigated by powder X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis. The micro area elements were characterized by electron probe micro-analyzer (EPMA) and x-ray photoelectron spectrometer (XPS). The thermo-sensitive properties were studied by resistance-temperature measurement system. The results reveal that two kinds of PTC ceramics have the same structure, similar elements, but different microstructure and valence concentration of titanium. It is suggested that difference of color of the PTC ceramics are originated from the defect concentration of titanium.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 243-247
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.243
• Online since: July 2016
• Authors: Ai Mei Yang, Jian Ming Deng, Cong Xue Su, Wen Hao Jia, Lai Jun Liu*
• Keywords: BaTiO₃, Color, Defect, PTC Ceramic

References

[1] W. Heywang, H. Thomann. Electronic Ceramics [M], London and New York, (1991).

[2] G. Arlt, D. Hennings, G. de, Dielectric properties of fine-grained barium titanate ceramics, J. Appl. Phys. 58 (1985) 1619-1625.

DOI: 10.1063/1.336051

[3] D. Hennings, Barium titanate based ceramic materials for dielectric use, Int. J. High Tech. Ceram. 3 (1987) 91-111.

[4] M. Kahn, Preparation of Small-Grained and Large-Grained Ceramics from Nd-Doped BaTiO3, J. Am. Ceram. Soc. 54 (1971) 452-454.

DOI: 10.1111/j.1151-2916.1971.tb12383.x

[5] M. N. Rahaman, R. Manalert, Grain boundary mobility of BaTiO3 dopedwith aliovalent cations, J. Eur. Ceram. Soc. 18 (1998) 1063-1071.

DOI: 10.1016/s0955-2219(97)00215-x

[6] S. K. Chiang, W. E. Lee, D. W. Readey, Core-Shell Structure in Doped BaTiO3, Am. Ceram. Bull. 66 (1987) 1230.

[7] X. X. Wang, H. L. W. Chan, Positive temperature coefficient of resistivity effect in niobium-doped barium titanate ceramics obtained at low sintering temperature, J. Eur. Ceram. Soc. 24 (2004) 1227.

DOI: 10.1016/s0955-2219(03)00379-0

[8] H. Takeda, Y. Hoshi, T. Kinoshita, et al., CFabrication of lead-free and high Tc BaTiO3-based thermistor ceramics using deoxidizing effect of oxygen-containing α-zirconium, Ceram. Int. 34 (2008) 2073-(2077).

DOI: 10.1016/j.ceramint.2007.08.009

[9] Y. Pu, J. Wei, Y. Mao, J. Wang, Positive temperature coefficient of resistivity behavior of Niobium- doped (1−x)BaTiO3–xBi0. 5Li0. 5TiO3 ceramics, J. Alloy. Compd. 498 (2010) 5-7.

DOI: 10.1016/j.jallcom.2010.03.149

[10] S. L. Jiang, Q. Jiang, H. B. Zhang, S. P. Gong, Study on BaTiO3 semiconducting ceramic materials with lower resistivity, J. Electroceramics. 21 (2008) 694-697.

DOI: 10.1007/s10832-007-9266-4

[11] S. W. Ding, G. Jia, J. Wang, Z. Y. He, Electrical properties of Y-and Mn-doped BaTiO3-based PTC ceramics, Ceram. Int. 34 (2008) 2007-(2010).

DOI: 10.1016/j.ceramint.2007.07.023

[12] I. H. Kim, H. W. Lee, Y. M. Kim, H. J. Kim, S. C. Ur, PTCR properties of Sb2O3-doped (Ba, Sr)TiO3, Mater. Let. 60 (2006) 3027-3030.

DOI: 10.1016/j.matlet.2006.02.037

[13] W. R. Huo, Y. F. Qu, Effects of Bi1/2Na1/2TiO3 on the Curie temperature and the PTC effects of BaTiO3-based positive temperature coefficient ceramics, Sens. Actuators A. 128 (2006) 265-269.

DOI: 10.1016/j.sna.2006.01.022

[14] Y. Pu, H. Wu, J. Wei, B. Wang, Influence of doping Nb5+ and Mn2+ on the PTCR effects of Ba0. 92Ca0. 05(Bi0. 5Na0. 5)0. 03TiO3 ceramics, J. Mater. Sci.: Mater. Electron. 22 (2011) 1479-1482.

DOI: 10.1007/s10854-011-0333-x

[15] E. D. Macklen, Thermistors, Electrochemical Publications. (1979)188-217.

[16] E. Brzozowski, M. S. Castro, Influence of Nb5+ and Sb3+ dopants on the defect profile, PTCR effect and GBBL characteristics of BaTiO3 ceramics, J. Eur. Ceram. Soc. 24 (2004) 2499-2507.

DOI: 10.1016/j.jeurceramsoc.2003.07.015

[17] O. Saburi, Properties of semiconductive barium titanates, J. Phys. Soc. Jpn. 14 (1959) 1159-1174.

DOI: 10.1143/jpsj.14.1159

[18] H. T. Langhammer, D. Makovec, Y. Pu, H. Abicht, M. Drofenik, Grain boundary reoxidation of donor-doped barium titanate ceramics, J. Eur. Ceram. Soc. 26 (2006) 2899-2907.

DOI: 10.1016/j.jeurceramsoc.2006.02.006

[19] D. Makovec, Z. Samardžija, D. Kolar, Solid solubility of cerium in BaTiO3,J. Solid State Chem. 123 (1996) 30-38.

DOI: 10.1006/jssc.1996.0148

[20] D. F. K. Hennings, B. Schreinemacher, H. Schreinemacher, High-permittivity dielectric ceramics with high endurance,J. Eur. Ceram. Soc. 13 (1994) 81-88.

DOI: 10.1016/0955-2219(94)90062-0

[21] Y. Y. Lu, T. Y, Electrical characteristics of (Pb, Sr)TiO3 positive temperature coefficient ceramics, Mater. Chem. Phys. 53 (1998)132-137.

DOI: 10.1016/s0254-0584(97)02073-7

[22] C. Rath, P. Mohanty, A. C. Pandey, N. C. Mishra, Oxygen vacancy induced structural phase transformation in TiO2 nanoparticles, J. Phys. D: Appl. Phys. 42 (2009) 205101.

DOI: 10.1088/0022-3727/42/20/205101