Abstract
The manufacture of multilayer capacitors based on barium titanate requires improved precursor powders. In this paper the dielectric properties of barium titanate ceramics made from hydrothermally precipitated material are compared with those powders obtained commercially and prepared by calcination. The greater porosity of hydrothermal powders tends to reduce their effective dielectric constant but preheating them to 950 ‡C before sintering produced high density ceramic with higher values of ɛr. The dielectric losses of these materials are higher than those produced by traditional methods. Their low Curie temperatures (106–8 ‡C) are related to the high strontium concentration (4.7 mol%) present in the starting materials. The grain sizes of these ceramics are less sensitive to sintering temperature than those made using calcined powders, with no anomalous grain growth.
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S. L. Swartz IEEE Trans Elec. Insulation 25 (1990) 935.
P. P. Phule andS. H. Risbud J. Mater. Sci. 25 (1990) 1169.
R. Vivekanandan S. Philip andT. R. N. Kutty Mater. Res. Bull. 22 (1986) 99.
H. Yamamura A. Watanabe S. Shirasaki Y. Moriyoshi andM. Tanada Cer. Intl 11 (1985) 17.
T. Yoko K. Kamiya andK. Tanaka J. Mater. Sci. 25 (1990) 3922.
F. Chaput J. P. Boilot andA. Beauger J. Amer. Cer. Soc. 73 (1990) 942.
M. I. Diaz-Guemes T. Gonzales Carreno C. J. Serna andJ. M. Palacios J. Mater. Sci. 24 (1989) 1011.
P. Nanni, M. Leoni, V. Buscaglia and G. Aliprandi,J. Europ. Ceram. Soc. in press.
A. J. Bell andA. J. Moulson Brit. Cer. Proc. 36 (1985) 57.
D. A. Hall andA. J. Moulson,Euroceramics, Vol. 2, Proceedings of The First European Ceramics Society Conference, 18–23 June 1989 (Elsevier Appl. Sci., London, 1989).
G. Arlt D. Hennings andG. de With J. Appl. Phys. 58 (1985) 1619.
H. T. Martirena andJ. C. Burfoot J. Phys. C Solid State Phys. 7 (1974) 3182.
B. Jaffe W. R. Cook andH. Jaffe, in Piezoelectrics Ceramics (Academic Press, London, 1971) P. 101.
W. D. Kingery H. K. Bowen andD. R. Uhlmann, Introduction to ceramics (John Wiley & Sons, New York, 1976) p. 948.
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Alvazzi Delfrate, M., Leoni, M., Nanni, L. et al. Electrical characterization of BaTiO3 made by hydrothermal methods. J Mater Sci: Mater Electron 5, 153–156 (1994). https://doi.org/10.1007/BF01198946
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DOI: https://doi.org/10.1007/BF01198946