Dielectric Characteristics of (A1/2 1+·A1/2 3+)TiO3 Ceramics at Microwave Frequencies
- 1 September 1991
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 30 (9S)
- https://doi.org/10.1143/jjap.30.2339
Abstract
We have investigated the dielectric characteristics at microwave frequencies of perovskites with the formula (A1/2 1+·A1/2 3+)TiO3, (where A1+ represents an alkali metal from the lithium to potassium series and A3+ represents a member of the lanthanide series from lanthanum to lutetium). It was found for the first time that in the case of Li1+ substitution at the A1+ site, the larger the ionic radius of the element which substituted at the A3+ site, the higher the dielectric constant was and the greater the negative shift of the temperature coefficient of resonant frequency was. For the (1-x)(Li1/2 1+·Sm1/2 3+)TiO3-x(Na1/2 1+·Sm1/2 3+)TiO3 system at 3 GHz, high dielectric properties of εr=81, Q=2050 and τf=+17ppm/ °C were obtained when x=0.4.Keywords
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