Moisture resistance of Nd1+Ba2−Cu3O -based ceramics
| Autor: | K. Iguchi, Y. Hiroshima, R. Komatsu, Tomoichiro Okamoto, H. Nagata |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Valence (chemistry) Materials science Process Chemistry and Technology Analytical chemistry Crystal structure Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials Tetragonal crystal system Lattice constant visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Orthorhombic crystal system Ceramic |
| Zdroj: | Ceramics International. 47:33577-33583 |
| ISSN: | 0272-8842 |
| Popis: | The moisture resistance of 5 mol% Nd2BaCuO5-added Nd1+xBa2−xCu3Oy (x = 0–0.8) ceramics was investigated. The samples were prepared by a solid-state reaction at 980 °C and exposed to a humid atmosphere at 40 °C and 93 %RH. The microstructure observation and X-ray diffraction measurement of the exposed samples revealed that the surface morphology and the crystal structure tended to be more stable when the amount of x was increased. The crystal structure was orthorhombic for x = 0 and tetragonal for x = 0.2–0.8. By comparing the lattice constants calculated by the bond valence to those determined by X-ray diffraction, it was suggested that a gap around the Ba site increased with the increasing x. The gap around the substituted Nd3+ for Ba2+ was considered to act as a trap site for OH−. |
| Databáze: | OpenAIRE |
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