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

^*Šī darba korespondējošais autors

Czech Academy of Sciences
University of Aveiro

Zinātniskās darbības rezultāts: Devums žurnālam › Zinātniskais raksts (žurnālā) › koleģiāli recenzēts

37 Atsauces (Scopus)

Kopsavilkums

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.

Oriģinālvaloda	Angļu
Raksta numurs	144104
Lapas (no-līdz)	144104-1-144104-10
Žurnāls	Physical Review B - Condensed Matter and Materials Physics
Sējums	69
Izdevuma numurs	14
DOIs	https://doi.org/10.1103/PhysRevB.69.144104
Publikācijas statuss	Publicēts - apr. 2004
Ārēji publicēts	Jā

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Porokhonskyy, V., Pashkin, A., Bovtun, V., Petzelt, J., Savinov, M., Samoukhina, P., Ostapchuk, T., Pokorný, J., Avdeev, M., Kholkin, A., & Vilarinho, P. (2004). Broad-band dielectric spectroscopy of SrTiO₃: Bi ceramics. Physical Review B - Condensed Matter and Materials Physics, 69(14), 144104-1-144104-10. Zinātniskais raksts 144104. https://doi.org/10.1103/PhysRevB.69.144104

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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",

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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.

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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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