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

  • Zhang Hui
  • Liu Zaiquan
  • Liu Hongfei
  • Fang Liang
  • Liu Hanxing
Article

Abstract

A new niobate Ba6Mg0.67Nb9.33O30 was synthesized in the BaO−MgO−Nb2O5 system by solid state reaction at 1350°C for 48 h. The structure and dielectric properties of Ba6Mg0.67Nb9.33O30 were determined by X-ray powder diffraction, scanning electron microscopy and dielectric measurements. The results show that Ba6Mg0.67Nb9.33O30 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. Ba6Mg0.67Nb9.33O30 belongs to relaxor ferroelectrics undergoing diffusive phase transition, and the transition temperature (Tc) is 30°C observed at 10 kHz. At room temperature, Ba6Mg0.67Nb9.33O30 ceramic has a high dielectric constant 850 at 1 MHz and a low dielectric loss of 0.0052.

Key words

Niobate tungsten bronze structure dielectric properties XRD relaxor ferroelectrics 

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Copyright information

© Wuhan University of Technology 2005

Authors and Affiliations

  • Zhang Hui
    • 1
  • Liu Zaiquan
    • 1
  • Liu Hongfei
    • 1
  • Fang Liang
    • 1
  • Liu Hanxing
    • 1
  1. 1.State Key Lab of Advanced Tech for Mater. Synthesis and ProcessingWuhan University of TechnologyWuhanChina

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