Microwave dielectric relaxation in cubic bismuth based pyrochlores containing titanium

Hong Wang, Stanislav Kamba, Huiling Du, Meiling Zhang, Chih Ta Chia, S. Veljko, S. Denisov, F. Kadlec, Jan Petzelt, Xi Yao

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42 Citations (Scopus)

Abstract

Cubic pyrochlore (Bi1.5Zn0.5)(Zn 0.5-x/3TixNb1.5-2x/3)O7 ceramics with 0≤x≤1.5 were synthesized and investigated between 100 Hz and 100 THz by means of broadband dielectric spectroscopy, time-domain terahertz transmission spectroscopy, Fourier transform infrared reflectivity spectroscopy and Raman scattering. Bi1.5ZnNb1.5O7 exhibits a microwave dielectric relaxation which slows down and broadens remarkably on cooling. Careful structural investigations confirmed that the relaxation originates in hopping of disordered Bi and part of Zn atoms in the A sites of the pyrochlore structure. Substitution of Ti atoms to the B sites, i.e., increasing x, results in an increase of the microwave permittivity from 150 to 200 of the relaxation frequency and also of the microwave quality Q. Low temperature Raman scattering experiments did not reveal any phase transition in the samples under study.

Original languageEnglish
Article number014105
JournalJournal of Applied Physics
Volume100
Issue number1
DOIs
Publication statusPublished - 2006 Jul 26

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Wang, H., Kamba, S., Du, H., Zhang, M., Chia, C. T., Veljko, S., Denisov, S., Kadlec, F., Petzelt, J., & Yao, X. (2006). Microwave dielectric relaxation in cubic bismuth based pyrochlores containing titanium. Journal of Applied Physics, 100(1), [014105]. https://doi.org/10.1063/1.2208915