Relationship between Angles for Mn–O–Mn and Electrical Properties of Orthorhombic Perovskite-Type (Ca1−xSrx)MnO3
✍ Scribed by Hideki Taguchi; Masanori Sonoda; Mahiko Nagao
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 270 KB
- Volume
- 137
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Orthorhombic perovskite-type (Ca 1؊x Sr x )MnO 3 (04x40.5) was synthesized by a standard ceramic technique. The cell constants increase monotonously with increasing x. The Rietveld analysis indicates that the Mn-O(1 and 2) distances are independent of x, whereas the Mn-O(1 and 2)-Mn angles increase with increasing x. Measurements of the electrical resistivity ( ) and the Seebeck coefficient ( ) indicate that (Ca 1؊x Sr x )MnO 3 is an n-type semiconductor in the range 04x40.5. Both the logarithm of the electrical resistivity (log ) and the activation energy (E a ) increase while the mobility ( ) decreases with increasing x. From these results, it is considered that the Mn-O(1 and 2)-Mn angles play an important role in the electrical properties.