采用計(jì)算相圖構(gòu)建的Ge-Pd體系熱力學(xué)模型
[Abstract]:In view of the difficulty of extrapolating the phase diagrams measured in the Ge-Pd system to the multicomponent system, a thermodynamic model of the Ge-Pd system using the computational phase diagram (Calphad) technique is proposed. Different thermodynamic models are used to describe the different types of phases in the Ge-Pd system. The pure component GE has almost no solid solubility to PD and can be directly used as the thermodynamic model published by the European study Group of Thermodynamics, and the liquid phase and interterminal solid solution (Pd) is described by the solution model. The stoichiometric compounds GePd2 and Ge8Pd21 are described by linear compound models, and the non-stoichiometric compounds Ge9Pd25 / GePd3, 偽 -GePdStack5 and 尾 -GePdst5 are described by sublattice models. For the thermodynamic model parameters of each phase, a set of self-consistent thermodynamic model in Ge-Pd system was obtained by using the existing experimental data of liquid phase mixing enthalpy, liquid phase mixing entropy, temperature and composition of invariant reaction. The calculated results of the thermodynamic model are consistent with most of the experimental data and can be extrapolated to the multicomponent system, thus providing a basis for the thermodynamic database construction, material composition design and preparation process optimization of the GE based multicomponent system.
【作者單位】: 長安大學(xué)材料科學(xué)與工程學(xué)院;北京百慕航材高科技股份有限公司;
【基金】:國家自然科學(xué)基金資助項(xiàng)目(51401032,51401033) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(0009-2014G1311089,310831163401)
【分類號(hào)】:O642.4
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