Dielectric response of centrosymmetric Na4.6FeP2O8.6F0.4crystals in a low-frequency range

Autor:	S Sigaryov
Rok vydání:	1994
Předmět:	Arrhenius equation Permittivity Phase transition Condensed matter physics Stereochemistry Chemistry Relaxation (NMR) Phase (waves) Physics::Optics Dielectric Atmospheric temperature range Condensed Matter Physics Crystal symbols.namesake symbols General Materials Science
Zdroj:	Journal of Physics: Condensed Matter. 6:3801-3812
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/6/20/020
Popis:	The dielectric response (DR) of centrosymmetric (space group, Ibam, at 293 K) Na4.6FeP2O8.6F0.4 single crystals has been studied in a wide temperature range 290-700 K and frequency interval 5-5*105 Hz. The DR reveals dipolar features. The corresponding dielectric relaxation has a non-Debye character. As a consequence. The frequency dependences of both in ' and in " can be fitted with a stretched-exponent approach. The value of the stretched exponent p significantly depends on temperature, exhibiting two peaks: the first peak is at the glass-crystal transition in the sodium subsystem of the crystal and the second peak is above the phase transition point to a modulated phase.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ca6cbf0060397545dcbca2557076152c https://doi.org/10.1088/0953-8984/6/20/020 Zobrazit plný text záznamu