Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
J Phys Condens Matter. 2011 Sep 14;23(36):365803. doi: 10.1088/0953-8984/23/36/365803. Epub 2011 Aug 22.
In this paper we apply the Aptekar-Ponyatovsky (AP) regular solution thermodynamic model to the analysis of experimental data for the coefficient of thermal expansion (CTE) and determine the AP model parameters for unalloyed cerium metal, Ce-Th-La alloys, and Pu-Ga alloys. We find that the high temperature CTE of cerium metal follows the predictions of the AP model based on low temperature, high pressure data. For Ce-Th-La alloys we use the AP parameters to track the suppression of the first-order γ-α cerium transition. We show the AP model accounts for the negative CTE observed for Pu-Ga alloys and is equivalent to an earlier invar model. Finally, we apply the AP parameters obtained for Pu-Ga alloys to rationalize the observed δ-α transformation pressures of these alloys. We show that the anomalous values of the Grüneisen and Grüneisen-Anderson parameters are important features of the thermal properties of plutonium. A strong analogy between the properties of plutonium and cerium is confirmed.
本文将 Aptekar-Ponyatovsky（AP）正则溶液热力学模型应用于热膨胀系数（CTE）的实验数据分析，确定了未合金化铈金属、Ce-Th-La 合金和 Pu-Ga 合金的 AP 模型参数。我们发现，铈金属的高温 CTE 遵循基于低温高压数据的 AP 模型的预测。对于 Ce-Th-La 合金，我们使用 AP 参数来跟踪抑制一阶 γ-α 铈转变。结果表明，AP 模型解释了 Pu-Ga 合金中观察到的负 CTE，并且与早期的 invar 模型相当。最后，我们将 Pu-Ga 合金的 AP 参数应用于合理化这些合金的 δ-α 转变压力的观察值。结果表明，格林乃森和格林乃森-安德森参数的异常值是钚的热性能的重要特征。钚和铈的性质之间存在很强的类比关系得到了证实。
