Abstract
ABSTRACT Investigations of composite materials with two different crystal structured ferroelectric ceramics were carried out. In this study, phase development, sintering behavior and dielectric characteristics of the composites of tungsten bronze structured ferroelectric K3Li2Nb5O15 (KLN) and perovskite structured BaTiO3 (BT) were examined as a function of molar ratio x in (1−x) K3Li2Nb5O15−xBaTiO3. A wide range of solid solution of BT in KLN was observed and the lattice constants of KLN decreased with BT contents. However, the solubility of KLN in BT was very narrow. X-ray analysis revealed that both KLN and BT phases coexisted in the samples from x = 0.4 to x = 0.8. Therefore, two dielectric relaxation peaks were observed in the samples with x = 0.4 ∼0.8, each of which is originated from KLN and BT phase, respectively. The solid solution between KLN and BT decreased the TC of both KLN and BT to lower temperature.
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