Author： Lin W-Y. Gerhardt R.A. Speyer R.F. Hsu J.Y.
Publisher： Springer Publishing Company
ISSN： 0022-2461
Source： Journal of Materials Science, Vol.34, Iss.12, 1999-06, pp. : 3021-3025
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Abstract
Sn-doped and undoped barium titanates pressed powder pellets were sintered at 1360 and 1390°C for 5 h. Though batched to form Ba_2Ti_9O_20, a two-phase microstructure of BaTi_4O_9 and TiO_2 formed from the undoped system. The dielectric constant at 6 GHz was 40 without SnO_2 additions. Doping with 1.64 mol % SnO_2 stabilized Ba_2Ti_9O_20 and formed a single-phase microstructure but resulted in higher porosity. Dilatometry studies implied that SnO_2 additions facilitated a greater fraction of reaction to occur in the solid state, causing a lower quantity of pore-filling fluid to form above 1317°C. As a result of the higher porosity, the dielectric constants and quality factors were also reduced.
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