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Colossal Dielectric Permittivity in (Nb+Al) Codoped Rutile TiO 2 Ceramics: Compositional Gradient and Local Structure

Hu, Wanbiao; Lau, Taim Soon (Kenny); Liu, Yun; Withers, Raymond; Chen, Hua; Fu, Lan; Gong, Bill; Hutchison, Wayne


(Nb+Al) codoped rutile TiO<inf>2</inf> ceramics with nominal composition Ti4+<inf>0.995</inf>Nb5+<inf>0.005y</inf>Al3+<inf>0.005z</inf>O<inf>2</inf>, z = (4-5y)/3 and y = 0.4, 0.5, 0.6, 0.7, and Ti4+<inf>0.90</inf>Nb5+<inf>0.05</inf>Al3+<inf>0.05</inf>O<inf>2</inf> have been synthesized. The resultant samples in ceramic pellet form exhibit a colossal dielectric permittivity (>-104) with an acceptably low dielectric loss (-10-1) after optimization of the processing conditions. It is found that a...[Show more]

CollectionsANU Research Publications
Date published: 2015
Type: Journal article
Source: Chemistry of Materials
DOI: 10.1021/acs.chemmater.5b01351


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