FERROELECTRIC BATIO3 CERAMICS SINTERED AT LOW-TEMPERATURE WITH THE AID OF A MIXTURE OF CAF2 AND LIF

A mixture of CaF2 and LiF has been used to sinter BaTiO3 at low temper ature. As a result, a new solid solution has been obtained after 2 h a t 930 degrees C. Mixing, grinding and heating were all performed in ai r with various starting compositions [(1-x)BaTiO3 + xCaF(2) + xLiF]. T he variation of the unit cell parameters has been determined and the s intering conditions optimized. Dielectric measurements have been perfo rmed on ceramic samples over the temperature and frequency ranges 150- 450 K and 10(2)-10(4) Hz, respectively. Each sample exhibited a large maximum for epsilon(r)' at the Curie temperature T-c.