Preparation, characterization and dielectric properties of Ba6Mg0.67Nb9.33O30 ceramic

Zhang Hui; Liu Zaiquan; Liu Hongfei; Fang Liang; Liu Hanxing

doi:10.1007/BF02835016

Journal of Wuhan University of Technology Materials Science Edition ›› 2005, Vol. 20 ›› Issue (3) : 14 -16. DOI: 10.1007/BF02835016

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Preparation, characterization and dielectric properties of Ba₆Mg_0.67Nb_9.33O₃₀ ceramic

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Abstract

A new niobate Ba₆Mg_0.67Nb_9.33O₃₀ was synthesized in the BaO−MgO−Nb₂O₅ system by solid state reaction at 1350°C for 48 h. The structure and dielectric properties of Ba₆Mg_0.67Nb_9.33O₃₀ were determined by X-ray powder diffraction, scanning electron microscopy and dielectric measurements. The results show that Ba₆Mg_0.67Nb_9.33O₃₀ belongs to ferroelectric phase of filled tetragonal tungsten bronze structure at room temperature with unit cell parameters: a=1.26052(4) nm, c=0.40045(2) nm, space group P4bm, calculated density 5.707 g·cm⁻³. Ba₆Mg_0.67Nb_9.33O₃₀ belongs to relaxor ferroelectrics undergoing diffusive phase transition, and the transition temperature (T_c) is 30°C observed at 10 kHz. At room temperature, Ba₆Mg_0.67Nb_9.33O₃₀ ceramic has a high dielectric constant 850 at 1 MHz and a low dielectric loss of 0.0052.

Keywords

Niobate / tungsten bronze structure / dielectric properties / XRD / relaxor ferroelectrics

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Zhang Hui, Liu Zaiquan, Liu Hongfei, Fang Liang, Liu Hanxing. Preparation, characterization and dielectric properties of Ba₆Mg_0.67Nb_9.33O₃₀ ceramic. Journal of Wuhan University of Technology Materials Science Edition, 2005, 20(3): 14-16 DOI:10.1007/BF02835016

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