Dielectric and infrared response of Ba0.77Ca0.23TiO3
Autor(en): | Savinov, ME Trepakov, VA Kamba, S Kapphan, SE Petzelt, J Pankrath, R Kislova, IL Kutsenko, AB Jastrabik, L |
Stichwörter: | Ba1-xCaxTiO3; BATIO3; dielectric permittivity; infrared spectroscopy; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Condensed Matter; SOFT-MODE SPECTROSCOPY; TEMPERATURE-DEPENDENCE; TRANSITION | Erscheinungsdatum: | 2003 | Herausgeber: | TAYLOR & FRANCIS LTD | Enthalten in: | FERROELECTRICS | Band: | 295 | Startseite: | 625 | Seitenende: | 632 | Zusammenfassung: | Low-frequency (100 Hz-1 MHz) dielectric permittivity and infrared reflectivity studies were performed for barium-calcium-titanate single crystals of the congruently melting composition Ba0.77Ca0.23TiO3, nominally pure (BCT77/23) and doped by Cr (70 ppm, BCT77/23:Cr). Both the materials reveal a sharp epsilon'(T) maximum at 375 K (cooling run) with a pronounced temperature hysteresis, evidencing a first-order ferroelectric phase transition (PT) O-h-->C-4v. The high-temperature wing of the epsilon'(T) maximum reveals a weak dispersion of a non-relaxation nature. The low-temperature wing contains a reproducible step in the epsilon'(T) dependence. Another low-temperature PT was found at similar to41 K. Cr doping strongly influences this PT shifting the position of the epsilon'(T) maximum to similar to20 K. Polarised IR reflectivity shows a huge |
Beschreibung: | 6th European Conference on Applications of Polar Dielectrics (ECAPD), AVEIRO, PORTUGAL, SEP 02-05, 2002 |
ISSN: | 00150193 | DOI: | 10.1080/00150190390239431 |
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geprüft am 07.06.2024