Relationship between Angles for Mn–O–Mn and Electrical Properties of Orthorhombic Perovskite-Type (Ca1−xSrx)MnO3

• Published in: Journal of solid state chemistry 1998-04, Vol.137 (1), p.82-86
• Main Authors: Taguchi, Hideki, Sonoda, Masanori, Nagao, Mahiko
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Conductivity phenomena in semiconductors and insulators; Electronic transport in condensed matter; Exact sciences and technology; Inorganic compounds; Low-field transport and mobility; piezoresistance; Physics; Salts; Structure of solids and liquids; crystallography; Structure of specific crystalline solids
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1997.7701

Orthorhombic perovskite-type (Ca1−xSrx)MnO3(0≤x≤0.5) was synthesized by a standard ceramic technique. The cell constants increase monotonously with increasingx. The Rietveld analysis indicates that the Mn–O(1 and 2) distances are independent ofx, whereas the Mn–O(1 and 2)–Mn angles increase with increasingx. Measurements of the electrical resistivity (ρ) and the Seebeck coefficient (α) indicate that (Ca1−xSrx)MnO3is an n-type semiconductor in the range 0≤x≤0.5. Both the logarithm of the electrical resistivity (logρ) and the activation energy (Ea) increase while the mobility (μ) decreases with increasingx. From these results, it is considered that the Mn–O(1 and 2)–Mn angles play an important role in the electrical properties.