Abstract
ABSTRACT Three components of ferroelectric-dielectric composite ceramic 85Vol% Ba0.5Sr0.5TiO3 – 15Vol% MgO, 78Vol% Ba0.45Sr0.55TiO3 – 22Vol% Mg2TiO4 and 48Vol% Ba0.4Sr0.6TiO3 – 52Vol% BaWO4 were chosen and synthesized by solid-phase reaction. The ferroelectric-dielectric system with different mixing degree was obtained by controlling the milling time. The effects of phase distribution on dielectric properties of composite were reflected. The two-phase distribution of the composite was changed from the layered and columnar dominated structure to the spherical structure, with increasing milling time from 5 min, 30 min, 10 h to 24 h. Permittivity and tunability were increased obviously by the transform of phase distribution patterns. However, the quality factor Q values were strongly deteriorated with extending milling time. Different ball-milling times are used to reflect different phase distribution modes, and the dielectric properties of two-phase composite ceramics in different phase distribution modes are well verified.
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