Broad-band dielectric spectroscopy of SrTiO3: Bi ceramics

V. Porokhonskyy; A. Pashkin; V. Bovtun; J. Petzelt; M. Savinov; P. Samoukhina; T. Ostapchuk; J. Pokorný; M. Avdeev; A. Kholkin; P. Vilarinho

doi:10.1103/PhysRevB.69.144104

Broad-band dielectric spectroscopy of SrTiO₃: Bi ceramics

V. Porokhonskyy^*
, A. Pashkin
, V. Bovtun
, J. Petzelt
, M. Savinov
, P. Samoukhina
, T. Ostapchuk
, J. Pokorný
, M. Avdeev
, A. Kholkin
, P. Vilarinho

^*Corresponding author for this work

Czech Academy of Sciences
University of Aveiro

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

37 Citations (Scopus)

Abstract

Lattice dynamics and dielectric relaxation phenomena of (Sr _1-1.5xBi_x)TiO₃ ceramics with x =0.0067-0.133 were studied in the temperature range of 10-400 K. The polar TO₁ soft mode in the IR spectra is strongly stiffened by Bi doping and its softening on cooling is gradually stopped. Increasing degree of local polar distortion induced by doping was detected by progressive activation of TO ₂ and TO₄ polar modes in the Raman spectra. Wide range (10²-1.8×10⁹; 10¹¹-2×10 ¹³ Hz) dielectric spectra were determined and carefully fitted with an appropriate model of relaxation time distribution. At least four relaxation regions were revealed and the dominant thermally activated region was assigned to nanocluster polarization dynamics. The enhanced absorption in the submillimeter range was assigned to anharmonic quasi-Debye losses.

Original language	English
Article number	144104
Pages (from-to)	144104-1-144104-10
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	69
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.69.144104
Publication status	Published - Apr 2004
Externally published	Yes

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10.1103/PhysRevB.69.144104

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title = "Broad-band dielectric spectroscopy of SrTiO3: Bi ceramics",

abstract = "Lattice dynamics and dielectric relaxation phenomena of (Sr 1-1.5xBix)TiO3 ceramics with x =0.0067-0.133 were studied in the temperature range of 10-400 K. The polar TO1 soft mode in the IR spectra is strongly stiffened by Bi doping and its softening on cooling is gradually stopped. Increasing degree of local polar distortion induced by doping was detected by progressive activation of TO 2 and TO4 polar modes in the Raman spectra. Wide range (102-1.8×109; 1011-2×10 13 Hz) dielectric spectra were determined and carefully fitted with an appropriate model of relaxation time distribution. At least four relaxation regions were revealed and the dominant thermally activated region was assigned to nanocluster polarization dynamics. The enhanced absorption in the submillimeter range was assigned to anharmonic quasi-Debye losses.",

author = "V. Porokhonskyy and A. Pashkin and V. Bovtun and J. Petzelt and M. Savinov and P. Samoukhina and T. Ostapchuk and J. Pokorn{\'y} and M. Avdeev and A. Kholkin and P. Vilarinho",

year = "2004",

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doi = "10.1103/PhysRevB.69.144104",

language = "English",

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TY - JOUR

T1 - Broad-band dielectric spectroscopy of SrTiO3

T2 - Bi ceramics

AU - Porokhonskyy, V.

AU - Pashkin, A.

AU - Bovtun, V.

AU - Petzelt, J.

AU - Savinov, M.

AU - Samoukhina, P.

AU - Ostapchuk, T.

AU - Pokorný, J.

AU - Avdeev, M.

AU - Kholkin, A.

AU - Vilarinho, P.

PY - 2004/4

Y1 - 2004/4

N2 - Lattice dynamics and dielectric relaxation phenomena of (Sr 1-1.5xBix)TiO3 ceramics with x =0.0067-0.133 were studied in the temperature range of 10-400 K. The polar TO1 soft mode in the IR spectra is strongly stiffened by Bi doping and its softening on cooling is gradually stopped. Increasing degree of local polar distortion induced by doping was detected by progressive activation of TO 2 and TO4 polar modes in the Raman spectra. Wide range (102-1.8×109; 1011-2×10 13 Hz) dielectric spectra were determined and carefully fitted with an appropriate model of relaxation time distribution. At least four relaxation regions were revealed and the dominant thermally activated region was assigned to nanocluster polarization dynamics. The enhanced absorption in the submillimeter range was assigned to anharmonic quasi-Debye losses.

AB - Lattice dynamics and dielectric relaxation phenomena of (Sr 1-1.5xBix)TiO3 ceramics with x =0.0067-0.133 were studied in the temperature range of 10-400 K. The polar TO1 soft mode in the IR spectra is strongly stiffened by Bi doping and its softening on cooling is gradually stopped. Increasing degree of local polar distortion induced by doping was detected by progressive activation of TO 2 and TO4 polar modes in the Raman spectra. Wide range (102-1.8×109; 1011-2×10 13 Hz) dielectric spectra were determined and carefully fitted with an appropriate model of relaxation time distribution. At least four relaxation regions were revealed and the dominant thermally activated region was assigned to nanocluster polarization dynamics. The enhanced absorption in the submillimeter range was assigned to anharmonic quasi-Debye losses.

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U2 - 10.1103/PhysRevB.69.144104

DO - 10.1103/PhysRevB.69.144104

M3 - Article

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 14

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ER -

Broad-band dielectric spectroscopy of SrTiO₃: Bi ceramics

Abstract

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