FABRICATION AND RESEARCH OF THE Au/BST/Au BULK CERAMIC CAPACITORS

Abstract

Widely used and prospective complex oxide ferroelectric material barium strontium titanate (BST) is synthesized. Bulk ceramics and capacitors are developed from synthesized BST powders. The synthesis of BST is realized by two different chemical synthesis methods: citrate-gel synthesis (CGS) and self-propagating high-temperature synthesis (SHS). The obtained powders and ceramics are characterized by means of SEM, EDS and XRD methods. From BST powders obtained by SHS and CGS high density ceramics (~5,1 g/cm³) have been made by dry pressing, which have been annealed in the oxygen atmosphere at a temperature of ~1300˚C. Based on the manufactured ceramics, Au/BST/Au ceramic capacitors have been developed, their dielectric properties are studied over a wide temperature and frequency range.