Abstract
Bi1.5-δCaδZnNb1.5O6O′ (0≤δ≤0.3) ceramics samples were prepared by conventional solid-state reaction methods. The effect of Ca2+ doping on dielectric properties, crystal chemistry characteristics and relaxor behavior of α-BZN pyrochlore were investigated. The dielectric constant decreases with increasing Ca content. The bond valance calculations revealed the dielectric constant was proportional to bond valance sum of O′ anions. When δ = 0, the dielectric relaxation is attributed to hopping of A-site cations, however, when δ > 0, the declining relaxor behavior is closely related to the increasing A-O′ bond valance, the change from perfect octahedral to regular cube.
Published Version
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