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Site selectivities of alkali ions in CsRb_2C_(60) and Cs_2RbC_(60) superconductors

机译:CsRb_2C_(60)和Cs_2RbC_(60)超导体中碱离子的位点选择性

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The temperature-dependent site selectivities of Cs and Rb ions in CsRb_2C_(60) and Cs_2C_(60) superconductors are computed using the free energy obtained from the configuration entropy and the total energy calculated using the ab initio pseudopotential density-functional theory. It is found that in CsRb_2C_(60) the smaller Rb ions can occupy a considerable number of large octahedral interstitial sites at high temperatures, however, the transition to random occupation never takes place. For Cs_2RbC_(60) the Cs occupancy of the large octahedral interstitial sites is almost always 100%, and, interestingly, the two tetrahedral interstitial sites are randomly occupied by Cs and Rb ions even at very low temperatures.
机译:CsRb_2C_(60)和Cs_2C_(60)超导体中Cs和Rb离子的温度依赖性位点选择性是使用从构型熵获得的自由能和使用从头算伪势密度函数理论计算出的总能量来计算的。发现在高温下CsRb_2C_(60)中较小的Rb离子可占据相当数量的大八面体间隙位置,但是,从未发生向随机占据的转变。对于Cs_2RbC_(60),大八面体间隙位置的Cs占有率几乎总是100%,有趣的是,即使在非常低的温度下,两个四面体间隙位置也被Cs和Rb离子随机占据。

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