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

doi:10.1063/1.2208915

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

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

Cubic pyrochlore (Bi_1.5Zn_0.5)(Zn _0.5-x/3Ti_xNb_1.5-2x/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. Bi_1.5ZnNb_1.5O₇ 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 language	English
Article number	014105
Journal	Journal of Applied Physics
Volume	100
Issue number	1
DOIs	https://doi.org/10.1063/1.2208915
Publication status	Published - 2006

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.2208915

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@article{44d9ed04fafa4d76a121bdba3b9c6326,

title = "Microwave dielectric relaxation in cubic bismuth based pyrochlores containing titanium",

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.",

author = "Hong Wang and Stanislav Kamba and Huiling Du and Meiling Zhang and Chia, {Chih Ta} and S. Veljko and S. Denisov and F. Kadlec and Jan Petzelt and Xi Yao",

note = "Funding Information: This work was supported by National 973-project of China under Grant No. 2002CB613302, NSFC project of China under Grant No. 50572085, Program for New Century Excellent Talents in University of China and Grant Agency of the Czech Republic (Projects Nos. 202/04/0993 and AVOZ 10100520), and Academy of Sciences of the Czech Republic (Project No. A1010213).",

year = "2006",

doi = "10.1063/1.2208915",

language = "English",

volume = "100",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Microwave dielectric relaxation in cubic bismuth based pyrochlores containing titanium

AU - Wang, Hong

AU - Kamba, Stanislav

AU - Du, Huiling

AU - Zhang, Meiling

AU - Chia, Chih Ta

AU - Veljko, S.

AU - Denisov, S.

AU - Kadlec, F.

AU - Petzelt, Jan

AU - Yao, Xi

N1 - Funding Information: This work was supported by National 973-project of China under Grant No. 2002CB613302, NSFC project of China under Grant No. 50572085, Program for New Century Excellent Talents in University of China and Grant Agency of the Czech Republic (Projects Nos. 202/04/0993 and AVOZ 10100520), and Academy of Sciences of the Czech Republic (Project No. A1010213).

PY - 2006

Y1 - 2006

N2 - 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.

AB - 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.

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Microwave dielectric relaxation in cubic bismuth based pyrochlores containing titanium

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