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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

42 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
文章編號014105
期刊Journal of Applied Physics
100
發行號1
DOIs
出版狀態已發佈 - 2006

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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