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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Low-temperature specific heat of non-stoichiometric beta-ytterbium deuteride
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Low-temperature specific heat of non-stoichiometric beta-ytterbium deuteride

机译：非化学计量β-氘化氘的低温比热

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摘要

Heat capacity measurements on a beta-ytterbium deuteride sample with the composition D/Yb=2.71 have been carried out over a temperature range from 1.9 to 260 K. Two anomalies were observed at 4 K and 230 K, respectively. On the grounds of the separated Schottky contribution to the specific heat, the influence of the crystal field on the splitting of the (2J+1)-fold degenerate ground state J=7/2 of the Yb~(3+) ion is analysed. The existence of two sublattices (sort of an electronic phase separation) of hydrogen atoms arranged by the two different ytterbium atom valencies is suggested. The sharp discontinuity in the specific heat at 230 K in YbD_(2.71) resembles that observed in the light rare earth hydrides REH_x in the composition range 2.7
机译：已在1.9至260 K的温度范围内对组成为D / Yb = 2.71的β-氘化氘-样品进行了热容量测量。分别在4 K和230 K处观察到两个异常。基于分离的肖特基对比热的贡献，分析了晶体场对Yb〜（3+）离子的（2J + 1）倍简并基态J = 7/2分裂的影响。 。建议存在由两个不同的atom原子价态排列的氢原子的两个亚晶格（一种电子相分离）。 YbD_（2.71）中在230 K时的比热的急剧不连续性类似于在轻稀土氢化物REH_x中观察到的在2.7

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