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DOI | 10.1038/ncomms14189 |
Phase stabilization by electronic entropy in plutonium | |
Harrison, N.1; Betts, J. B.1; Wartenbe, M. R.1; Balakirev, F. F.1; Richmond, S.2; Jaime, M.1; Tobash, P. N.2 | |
2019-07-18 | |
发表期刊 | NATURE COMMUNICATIONS |
ISSN | 2041-1723 |
出版年 | 2019 |
卷号 | 10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Plutonium metal undergoes an anomalously large 25% collapse in volume from its largest volume delta phase (delta-Pu) to its low temperature a phase, yet the underlying thermodynamic mechanism has largely remained a mystery. Here we use magnetostriction measurements to isolate a previously hidden yet substantial electronic contribution to the entropy of delta-Pu, which we show to be crucial for the stabilization of this phase. The entropy originates from two competing instabilities of the 5f-electron shell, which we show to drive the volume of Pu in opposing directions, depending on the temperature and volume. Using calorimetry measurements, we establish a robust thermodynamic connection between the two excitation energies, the atomic volume, and the previously reported excess entropy of delta-Pu at elevated temperatures. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000475852900002 |
WOS关键词 | VOLUME MAGNETOSTRICTION ; DELTA-PLUTONIUM ; VALENCE TRANSITION ; 5F STATES ; PU ; FIELD ; TRANSFORMATIONS ; CONFIGURATION ; PARAMETERS ; STABILITY |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/203180 |
专题 | 资源环境科学 |
作者单位 | 1.Los Alamos Natl Lab, Mail Stop E536, Los Alamos, NM 87545 USA; 2.Los Alamos Natl Lab, Mail Stop E574, Los Alamos, NM 87545 USA |
推荐引用方式 GB/T 7714 | Harrison, N.,Betts, J. B.,Wartenbe, M. R.,et al. Phase stabilization by electronic entropy in plutonium[J]. NATURE COMMUNICATIONS,2019,10. |
APA | Harrison, N..,Betts, J. B..,Wartenbe, M. R..,Balakirev, F. F..,Richmond, S..,...&Tobash, P. N..(2019).Phase stabilization by electronic entropy in plutonium.NATURE COMMUNICATIONS,10. |
MLA | Harrison, N.,et al."Phase stabilization by electronic entropy in plutonium".NATURE COMMUNICATIONS 10(2019). |
条目包含的文件 | 条目无相关文件。 |
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