Impedance Analyses of Alumina-Molybdenum (Al2O3-Mo) Composites

Autor:	S. Hussain, O. Sbaizero
Rok vydání:	2012
Předmět:	Materials science chemistry.chemical_element Atmospheric temperature range Intergranular corrosion Microstructure Dielectric spectroscopy Metal chemistry Molybdenum visual_art visual_art.visual_art_medium Grain boundary Crystallite Composite material
Zdroj:	Dhaka University Journal of Science. 60:277-281
ISSN:	2408-8528 1022-2502
DOI:	10.3329/dujs.v60i2.11533
Popis:	The microstructure and electrical properties of Al2O3-Mo composites were investigated. Different amounts of molybdenum (5, 10, 20, 25 vol%) were added to alumina matrix and the resulting mixture was hot pressed to produce dense metal toughened-ceramic composites. The electrical properties of the composites were examined using impedance spectroscopy in the temperature range 250° C - 1000° C at 50° C temperature intervals. From the analysis, two readily resolvable arcs were found to be present: the one at higher frequencies is the intragranular (grain) response of the bulk; the other is the intergranular (grain boundary) response caused in the internal surfaces of polycrystalline specimens at low frequencies. The effects of grains and grain boundaries on the electrical properties of the composites vary with the composition and temperature. The temperature and composition dependence of grain and grain boundary conductivities are explained by the microstructure.DOI: http://dx.doi.org/10.3329/dujs.v60i2.11533 Dhaka Univ. J. Sci. 60(2): 277-281, 2012 (July)
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6f33e280eba9f48d2d739315f5c67df9 https://doi.org/10.3329/dujs.v60i2.11533 Zobrazit plný text záznamu