多晶钚-γ的弹性模量与温度的关系。

Polycrystalline gamma-plutonium's elastic moduli versus temperature.

机构信息

Department of Physics, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, USA.

出版信息

J Acoust Soc Am. 2010 Feb;127(2):741-5. doi: 10.1121/1.3271036.

PMID:20136196

Abstract

Resonant ultrasound spectroscopy was used to measure the elastic properties of pure polycrystalline (239)Pu in the gamma-phase. Shear and longitudinal elastic moduli were measured simultaneously and the bulk modulus was computed from them. A smooth, linear, and large decrease in all elastic moduli with increasing temperature was observed. The Poisson ratio was calculated and an increase from 0.242 at 519 K to 0.252 at 571 K was found. These measurements on extremely well-characterized pure Pu are in agreement with other reported results where overlap occurs. We calculated an approximate Debye temperature Theta(D)=144 K. Determined from the temperature variation in the bulk modulus, gamma-Pu shows the same Gruneisen parameter as copper.

摘要

利用共振超声光谱法测量了纯多晶（239）Pu 在 γ 相中的弹性性质。同时测量了剪切和纵向弹性模量，并由此计算出体积模量。观察到所有弹性模量随温度升高而呈光滑、线性和大幅下降。计算了泊松比，发现其从 519 K 时的 0.242 增加到 571 K 时的 0.252。这些在经过极严格特性表征的纯 Pu 上进行的测量结果与其他发生重叠的报告结果一致。我们计算出了一个近似德拜温度θ(D)=144 K。从体积模量的温度变化来看，γ-Pu 的格林艾森参数与铜相同。