采用熔化自由能法、标准生成自由能法和化学平衡法推导出利用8种类型的三元相图计算活度的公式,覆盖了三元相图的点、线、面全部范围.公式本身没有引进假设和近似.这8种类型的三元相图涵盖了有液相面各种类型的三元相图.本研究的计算方法和计算公式可以应用于各种复杂的三元相图,该方法也可以推广到三元等温截面相图和三元以上的多元相图.
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