Electronic Transport Phenomena of La2/3+xTiO3-δ(x < 0.2): Metal-Nonmetal Transition by Electron Doping

✍ Scribed by In-Seon Kim; Tetsurō Nakamura; Yoshiyuki Inaguma; Mitsuru Itoh

• Book ID: 102607035
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 328 KB
• Volume: 113
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1372

✦ Synopsis

Carriers were introduced into (\mathrm{La}{2 / 3} \mathrm{TiO}{3}), an insulator with double perovskite structure having an (A)-site vacancy, by a hydrogen reduction, and their electronic transport phenomena and crystal structure were studied. The lightly doped samples showed semiconducting behavior, while the heavily doped samples showed metallic conductivity. This carrier-concentration-dependent metal-nonmetal transition has been found at (3 d) electron density of 0.33 per formula unit with simultaneous occurrence of a crystal symmetry change from (P 4 / \mathrm{mmm}) to Pnma. The electronic state of the (\mathrm{La}{2 / 3+x} \mathrm{TiO}{3-\delta}) system was characterized by measuring the resistivity, the Seebeck coefficient, and the magnetic susceptibility. 1994 Academic Press, Inc.