Abstract
THE investigations carried out by Berberich1, Von Hippel2 and Wainer3 and their associates on titanium dioxide point to certain optimum firing conditions. In particular, a temperature of 1,350° C. is found to be suitable for obtaining most of the desirable electrical characteristics. Among these characteristics may be specially mentioned low water absorption, high permittivity, high insulation resistance and low loss-angle. From the known values of the two principal permittivities of the single crystal of rutile, the permittivity for randomly oriented powdered rutile would be about 114. The values of the permittivity reported in the literature vary from 96 to 100, and water absorption is known to be about 0.1 per cent. The rutile form of titanium dioxide used in their experiments was prepared by calcining commercial quality titanium dioxide, probably of the anantase type, at 1,350° C.
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References
Berberich, L. J., and Bell, M. E., J. App. Phys., 2, 681 (1940).
Von Hippel, A., et al., Indust. and Eng. Chem., 38, 1097 (1946).
Wainer, E., Trans. Electrochem. Soc., 89, reprint 3 (1946).
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RAMAMURTI, T., GANAPATHY, C. & SARAN, S. Low-temperature Sintering of Titanium Dioxide for Ceramic Capacitors. Nature 174, 1187 (1954). https://doi.org/10.1038/1741187a0
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DOI: https://doi.org/10.1038/1741187a0
