Structural and dielectric properties of Ba₅ R NiNb₉O₃₀ (R=La, Nd and Sm) ceramics

Abstract

Three novel Ba₅RNiNb₉O₃₀ (R=La, Nd and Sm) ceramics were prepared and characterized in the BaO−R₂O₃−NiO−Nb₂O₅ system. All three compounds are paraelectric phases adopting the filled tetragonal tungsten bronze (TB) structure at room temperature. At 1MHz, Ba₅RNiNb₉O₃₀ ceramics have a high dielectric constants in the range 193–245.3, a low dielectric loss in range 0.0059–0.0087, and the temperature coefficients of the dielectric constant (τ_ε) in the range −1140- −1310×10⁻⁶·°C⁻¹. Their temperature coefficients of the dielectric constant are significantly reduced compared to those of Ba₅RTi₃Ta₇O₃₀ (R=La, Nd, Sm) ceramics.

Keywords

Tungsten bronze / X-ray diffraction / Dielectric properties

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