دورية
Eu Doping in the GdCd7.88Quasicrystal and Its Approximant Crystal GdCd6
| العنوان: | Eu Doping in the GdCd7.88Quasicrystal and Its Approximant Crystal GdCd6 |
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| المؤلفون: | Denoel, Fernand, Huang, Yu-Chin, Kondedan, Neha, Rydh, Andreas, Pay Gómez, Cesar, Mathieu, Roland |
| المصدر: | Inorganic Chemistry; March 2024, Vol. 63 Issue: 11 p5040-5051, 12p |
| مستخلص: | The effect of Eu doping in the Tsai quasicrystal (QC) GdCd7.88and its periodic 1/1 approximant crystal (AC) GdCd6are investigated. This represents the first synthesis of Eu-containing stable QC samples, where three samples with the final composition Gd1–xEuxCd7.6±αat Eu doping concentrations x= 0.06, 0.13, and 0.19 are obtained (α ∼ 0.2). They are compared to two 1/1 ACs with compositions Gd1–xEuxCd6(x= 0.12, 0.16). In addition, a new type of 1/1 AC, differing only by the inclusion of extra Cd sites unique to the Eu4Cd251/1 AC, has been discovered and synthesized for the concentrations Gd1–xEuxCd6+δ(x= 0.25, 0.33, 0.45, 0.69, 0.73, and 0 < δ ≤ 0.085). Due to the preferred cube morphology of its single grains, we refer to them as c-type 1/1 ACs and to the conventional standard ones as s-type. In both QCs and s-type ACs, the Eu content appears to saturate at a concentration of ∼20%. On the other hand, any Gd| Eu ratio is allowed in the c-type ACs, varying continuously between GdCd6and Eu4Cd25. We describe and contrast the changes in composition, atomic structure, specific heat, and magnetic properties induced by Eu doping in the quasicrystalline phase and the s-type and c-type 1/1 ACs. By comparing our results to the literature data, we propose that the occupancy of the extra Cd sites can be used to predict the stability of Tsai-type quasicrystalline phases. |
| قاعدة البيانات: | Supplemental Index |
Find this issue from the American Chemical Society | تدمد: | 00201669 1520510X |
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| DOI: | 10.1021/acs.inorgchem.3c04500 |