Correlation between vibrational modes and dielectric properties in (Ca1-3xBi2xΦx)MoO4 ceramics

Jing Guo, Clive A. Randall, Di Zhou, Gaoqun Zhang, Caihong Zhang, Biaobing Jin, Hong Wang

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Abstract

The Raman, infrared reflectivity and terahertz spectra of A-site deficient scheelite materials (Ca1-3xBi2xΦx)MoO4 (Φ: A-site vacancy) were studied to evaluate the correlation between the vibrational modes and the dielectric properties. The Raman spectra were fitted with the Lorentzian model and the changes of resonance frequencies and full width at half maximum of the resonance were discussed. With the substitution of Bi into the A site of CaMoO4, the associated ionic compensation produces an increase in disorder which can contribute to an increase in dielectric losses. The harmonic oscillator model was used to fit infrared reflectivity spectra and the obtained complex dielectric response was extrapolated down into the terahertz and microwave region. The contributions of each mode to the microwave dielectric properties were investigated. It was found that the modes at low frequencies which are related to AO8 polyhedra play the most important role in the microwave dielectric properties of (Ca1-3xBi2xΦx)MoO4.

Original languageEnglish (US)
Article number10252
Pages (from-to)4459-4464
Number of pages6
JournalJournal of the European Ceramic Society
Volume35
Issue number16
DOIs
StatePublished - Dec 2015

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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