Relaxation Polarization Dielectrics An Assessment of the System (Sr, Ba, Ca)TiO 3 -Bi 2 O 3 -TiO 2 †
- 1 May 1959
- journal article
- electronics section
- Published by Taylor & Francis in Journal of Electronics and Control
- Vol. 6 (5) , 385-396
- https://doi.org/10.1080/00207215908937167
Abstract
Ceramic solid solutions of the system SrTiO3-Bi 2O3-nTiO2, where n was varied between 0 and 4, have been prepared from SrC O2 or SrTiO3, BiO2 O3 and TiO2 in a wide range of compositions for assessment as capacitor dielectrics. The effect of partial and complete substitution of Ba or Ca for Sr has also been investigated. Dielectrics have been prepared with permittivities of up to 1500 at room temperature and a negative temperature coefficient above – 80°c. Some compositions examined had dielectric loss tangents below 0-003 over the range — 30 deg;c to 200 °c at frequencies below 1 Mc/s, and promise to be useful as capacitor dielectrics. Above 1 Mc/s the dielectric loss rises rapidly. The ceramics with n = 2 showed loss maxima at — 125 deg;C and peak permittivities at about -90°c.Keywords
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