Separation of dielectric and space charge polarizations in CaCu3Ti4O12∕CaTiO3 composite polycrystalline systems

Autor:	Miguel Angel Ramírez, Elson Longo, William C. Ribeiro, Paulo Roberto Bueno, José Arana Varela
Rok vydání:	2007
Předmět:	Condensed Matter::Materials Science Dipole Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Rectangular potential barrier Grain boundary Dielectric Polarization (electrochemistry) Space charge Capacitance Cole–Cole equation
Zdroj:	Applied Physics Letters. 90:142912
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.2720301
Popis:	The complex analysis of dielectric/capacitance is a very useful approach to separate different polarization contributions existing in polycrystalline ceramics. In this letter, the authors use this type of spectroscopic analysis to separate the bulk’s dielectric dipolar relaxation contributions from the polarization contribution due to space charge in the grain boundaries of a CaCu3Ti4O12∕CaTiO3 polycrystalline composite system. The bulk dielectric dipolar relaxation was attributed to the self-intertwined domain structures from the CaCu3Ti4O12 phase coupled to the dipole relaxation from the CaTiO3 phase, while the space charge relaxation was attributed to the Schottky-type potential barrier responsible for the highly non-Ohmic properties observed in this composite polycrystalline system.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b08868a5c06d441c8078cdba1d043253 https://doi.org/10.1063/1.2720301 Zobrazit plný text záznamu