Metal-nonmetal transition in Ca3Ti2O7-δ(δ < 0.003)

• Published in: Journal of materials science Vol. 40; no. 14; pp. 3837 - 3839
• Main Author: JUNG, Woo-Hwan
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.07.2005; Springer Nature B.V
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity of specific materials; Electronic transport in condensed matter; Electrotechnical and electronic ceramics; Exact sciences and technology; Materials science; Physics; Technical ceramics; Transition-metal compounds; Calcium oxide; Electrical conductivity; Electrical properties; Metal non metal transition; Temperature effect; Manufacturing; Calcium Titanium Oxides Mixed; Experimental study; Titanium oxide; Non stoichiometric composition; Oxide ceramics; Electroceramics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-005-2559-6

The electrical conduction properties of the reduced Ca3Ti2O7-delta are reported. This compound is a member of the Ruddlesden-Popper type layered compounds with the general formula Can+1TinO3n+1 (n = 2). Stoichiometric compound Ca3Ti2O7 is a good insulator with high resistivity although Ti has a formal valency of 3+. However, the Ca3Ti2O7-delta which shows a metal-nonmetal transition by changing the temperature is the most interesting case. The electrical properties of reduced Ca3Ti2O7-delta have been reported, but detailed transport mechanism and properties of charge carrier have not yet been published.