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Eu Doping in the GdCd7.88 Quasicrystal and Its Approximant Crystal GdCd6

التفاصيل البيبلوغرافية
العنوان: Eu Doping in the GdCd7.88 Quasicrystal and Its Approximant Crystal GdCd6
المؤلفون: Denoel, Fernand, Huang, Yu-Chin, Kondedan, Neha, Rydh, Andreas, 1973, Gomez, Cesar Pay, Mathieu, Roland
المصدر: Inorganic Chemistry. 63(11):5040-5051
الوصف: The effect of Eu doping in the Tsai quasicrystal (QC) GdCd7.88 and its periodic 1/1 approximant crystal (AC) GdCd6 are investigated. This represents the first synthesis of Eu-containing stable QC samples, where three samples with the final composition Gd1-xEux Cd-7.6 +/-alpha at Eu doping concentrations x = 0.06, 0.13, and 0.19 are obtained (alpha similar to 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 Eu4Cd25 1/1 AC, has been discovered and synthesized for the concentrations Gd1-xEuxCd6+delta (x = 0.25, 0.33, 0.45, 0.69, 0.73, and 0 < delta <= 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 similar to 20%. On the other hand, any Gd| Eu ratio is allowed in the c-type ACs, varying continuously between GdCd6 and 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.
وصف الملف: print
URL الوصول: https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-227724
https://doi.org/10.1021/acs.inorgchem.3c04500
قاعدة البيانات: SwePub
الوصف
تدمد:00201669
1520510X
DOI:10.1021/acs.inorgchem.3c04500