Impedance analysis of Bi3.25La0.75Ti3O12 ferroelectric ceramic

Autor:	S. Bhattacharyya, Surya M. Gupta, S. Rachna
Rok vydání:	2008
Předmět:	Materials science Condensed matter physics visual_art Relaxation (NMR) visual_art.visual_art_medium General Physics and Astronomy Grain boundary Activation energy Ceramic Electrical impedance Capacitance Ferroelectricity Perovskite (structure)
Zdroj:	Pramana. 71:599-610
ISSN:	0973-7111 0304-4289
DOI:	10.1007/s12043-008-0135-8
Popis:	AC impedance spectroscopy technique has been used to study electrical properties of Bi3.25La0.75Ti3O12 (BLT) ceramic. Complex impedance plots were fitted with three depressed semicircles, which are attributed to crystalline layer, plate boundary and grain boundary and all three were found to comprise of universal capacitance nature [C = C0wn−1]. Grain boundary resistance and capacitance evaluated from complex impedance plots have larger values than that of plate boundary and crystalline layer. The activation energies (Ea) for DC-conductance in grain boundary, plate boundary and crystalline layer are 0.68 eV, 0.89 eV and 0.89 eV, respectively. Relaxation activation energies calculated from impedance plots showed similar values, 0.81 eV and 0.80 eV for crystalline layer and plate boundary, respectively. These activation energy values are found to be consistent with the Ea value of oxygen vacancies in perovskite materials. A mechanism is offered to explain the generation of oxygen vacancies in BLT ceramic and its role in temperature dependence of DC-conductance study.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1a95baf5b7861a268b1e54476188559c https://doi.org/10.1007/s12043-008-0135-8 Zobrazit plný text záznamu Plný text ve formátu PDF