STABILIZATION OF THE LOW TEMPERATURE COEFFICIENT OF DIELECTRIC CONSTANT OF Ca_5Nb_2TiO_12 BY Zr DOPING

摘要

The effects of small amounts of Zr substitution for Ti in the low loss, low temperature coefficient dielectric material Ca_5Nb_2TiO_12, are reported. Substi- tutions at the l-5/100 level significantly increase the range of possible firing temperatures at which polycrystalline ceramics with low temperature coeffi- cients can be obtained. This low temperature coefficient state is at the bor- derline between ordered and disordered states of the Ca, Nb, and Ti ions in the B sites of the perovskite lattice. The kinetics for ordering is apparently enhanced by the Zr substitutions.