Wide range dielectric and infrared spectroscopy of (Nb plus In) co-doped rutile ceramics

0493522 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Bovtun, Viktor - Petzelt, Jan - Kempa, Martin - Nuzhnyy, Dmitry - Savinov, Maxim - Kamba, Stanislav - Yee, S.M.M. - Crandles, D.A.
Wide range dielectric and infrared spectroscopy of (Nb plus In) co-doped rutile ceramics.
Physical Review Materials. Roč. 2, č. 7 (2018), s. 1-10, č. článku 075002. ISSN 2475-9953. E-ISSN 2475-9953
Grant CEP: GA MŠMT EF16_019/0000760; GA ČR GA18-09265S; GA ČR GA15-08389S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: dielectric and IR spectroscopy * giant permittivity
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.926, rok: 2018

It is argued that the colossal dielectric permittivity reported by Hu et al. [Hu et al., Nat.Mater. 12, 821(2013)]has the same explanation as in the original colossal permittivity material CaCu3TiO4O12(CCTO), namely, a combination of the internal barrier layer capacitor (IBLC) and the surface barrier layer capacitor (SBLC) effects. The IBLC effect is caused by a microstructure consisting of insulating grain boundaries (thickness ˷ 1 nm and conductivity of ˷ 10-6 S/cm) surrounding interior regions of bulk conductivity approximately equal to 10-1 S/cm. The SBLC effect is the result of a depletion layer adjacent to the contacts approximately 100 nm thick with conductivity of 5*10-7 S/cm. The SBLC and IBLC effects give rise to dielectric relaxations in low-frequency and radiofrequency regions, respectively.
Trvalý link: http://hdl.handle.net/11104/0286880