LaCuO25+x and YCuO2.5+x Delafossites: Materials with Triangular Cu2+δ Planes
| Autor: | Chien-Te Chen, J. J. Krajewski, Robert J. Cava, H. W. Zandbergen, R.S. Roth, W. F. Peck, Arthur P. Ramirez, Hidenori Takagi, G. Meigs, Joseph V. Waszczak, Lynn Schneemeyer |
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| Rok vydání: | 1993 |
| Předmět: |
X-ray spectroscopy
Materials science Mineralogy Crystal structure Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Octahedron Electron diffraction X-ray crystallography Materials Chemistry Ceramics and Composites Cuprate Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Journal of Solid State Chemistry. 104:437-452 |
| ISSN: | 0022-4596 |
| Popis: | The YCuO2 and LaCuO2 delafossites consist of alternating triangular planes of Ln3+ octahedra and O -Cu1+-O sticks. Here it is shown that under a limited set of conditions they may be oxidized to form new delafossite-derived phases YCuO2.5+x, 0 ≤ x ≤ 0.05, and LaCuO25+x, 0.07 ≤ x ≤ 0.18. Electron microscopy and powder X-ray diffraction are employed to characterize the resulting structures. Temperature-dependent resistivities and magnetic susceptibilities are reported. Characterization by soft X-ray photoabsorbtion spectroscopy, which shows them to be electronically unlike cuprates such as La2-xSrxCuO4, is also reported. |
| Databáze: | OpenAIRE |
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