The Gd-Co-Al system at 870/1070 K as a representative of the rare earth-Co-Al family and new rare-earth cobalt aluminides: Crystal structure and magnetic properties
| Autor: | Satish K. Malik, Vasiliy O. Yapaskurt, S. Quezado, Alexey V. Garshev, Jinlei Yao, A.V. Knotko, Yurij Mozharivskyj, A.V. Morozkin, R. Nirmala, Fang Yuan |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science chemistry.chemical_element 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography chemistry 0103 physical sciences Materials Chemistry Ceramics and Composites Magnetic refrigeration Antiferromagnetism Physical and Theoretical Chemistry Solubility 0210 nano-technology Ternary operation Single crystal Cobalt Solid solution |
| Zdroj: | Journal of Solid State Chemistry. 261:62-74 |
| ISSN: | 0022-4596 |
| Popis: | The Gd-Co-Al system has been investigated at 870/1070 K by X-ray and elemental EDS analyses. The existence of the known compounds Gd2Co3Al9 (Y2Co3Ga9-type), Gd3Co4.5Al11.5 (Gd3Co4.6Al11) (Gd3Ru4Al12-type), Gd3Co6–7.4Al3–1.6 (CeNi3-type), GdCo1.15–0.65Al0.85–1.35 (MgZn2-type), Gd2Co2Al (Mo2NiB2-type) and Gd3Co3.5–3.25Al0.5–0.75 (W3CoB3-type) has been confirmed at 870/1070 K. Structure types have been determined for Gd2Co6Al19 (U2Co6Al19-type), Gd7Co6Al7 (Pr7Co6Al7-type), Gd6Co2–2.21Al1–0.79 (Ho6Co2Ga-type) and Gd14Co3.2Al2.8 (Gd14Co2.58Al3.42 at 970 K) (Lu14Co3In3-type). The structures of Gd6Co2Al, Gd6Co2.21Al0.79 and Gd14Co2.58Al3.42 flux-grown at 970 K have been refined from the single crystal X-ray diffraction data. Additionally, new ternary compounds Gd2Co5.7–5.3Al1.3–1.7 (Er2Co7-type) and ~Gd58Co20Al22 (unknown type structure) have been identified. Quasi-binary solid solutions were detected for Gd2Co17, GdCo5, Gd2Co7, GdCo3, GdCo2 and GdAl2 at 870/1070 K, while no appreciable solubility was observed for the other binary compounds in the Gd-Co-Al system. Magnetic properties of the Gd2Co3Al9, Gd3Co4.6Al11, Gd7Co6Al7, Gd6Co2.2Al0.8 and Gd14Co2.58Al3.42 compounds have been studied and are presented in this work. Gd6Co2.2Al0.8, Gd3Co4.6Al11, Gd7Co6Al7 and Gd14Co2.58Al3.42 order ferromagnetically, while Gd2Co3Al9 displays antiferromagnetic transition. Additionally, {Y, Sm, Tb - Tm}2Co6Al19 (U2Co6Al19-type), Yb2Co3Al9 (Y2Co3Ga9-type), {Y, Sm, Tm, Yb}3Co4.6Al11 (Gd3Ru4Al12-type) and Tb7Co6Al7 (Pr7Co6Al7-type) compounds have been synthesized and investigated. |
| Databáze: | OpenAIRE |
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