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采用亚晶格模型,辅助以第一性原理总能计算,研究了Ll2结构的Co3Ti基金属间化合物中元素的占位有序化行为.结果表明,Co3Ti化学计量比合金呈现完全有序化;对于xco/xTi为3:1的Co72Ti24M4合金,第3合金组元M为Si或Ta时,M与Ti共同占据la位置,M为Cu、Ni、Pd、Rh、V或W时,M与Co占据3c位置,而当M为Al、Cr、Ge、Mn、Sc或Y时,M在la和3c位置的占位分数相同,这些元素的占位行为均不受温度影响;而当M为Fe、Hf、Mo、Nb、Ru和Zr的占位情况随温度发生变化.随原子核外层电子的增加,原子占位逐渐倾向于从la亚晶格转向3c位置.亦预测了xCo/xTi偏离3∶1的部分合金的占位分数随合金成分和温度的变化细节,预测结果与文献进行了比较,并澄清了文献上的分歧.

参考文献

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