The Nowotny chimney ladder phases:: Following the cpseudo clue toward an explanation of the 14 electron rule
The Nowotny chimney ladder phases:: Following the cpseudo clue toward an explanation of the 14 electron rule
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DOI：
10.1021/ic049427n
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发表时间：
2004-10-04
影响因子：
4.6
通讯作者：
Lin, JH
中科院分区：
文献类型：
--
作者：
Fredrickson, DC;Lee, S;Lin, JH
我们解释了Nowotny烟囱阶梯相的两个经验规则(NCLS，形式为TtEm的金属间化合物；T，4-9族；E，13-15族)。第一个规则是，对于后过渡金属NCLS，每个T原子的价电子总数是14个。第二个规则是出现一个间距为c(伪)的伪周期，它与化学计量比TtEm直接相关，(2T-m)c(伪)=c。这两个规则都是通过将NCLS视为由厚度为c(伪)/2的母体化合物RuGa2的块构成的孪生结构来解释的，连续的层相互旋转90度。然后，在层与层之间的界面上删除空间位阻的E原子，然后是弛豫。
We account for two empirical rules of the Nowotny chimney ladder phases (NCLs, intermetallic compounds of the form TtEm; T, groups 4-9; E, groups 13-15). The first rule is that for late transition metal NCLs the total number of valence electrons per T atom is 14. The second is the appearance of a pseudoperiodicity with a spacing, c(pseudo), which is directly related to the stoichiometry, TtEm, by (2t - m) c(pseudo) = c. Both rules are accounted for by viewing the NCLs as twinned structures constructed from blocks of the parent compound, RuGa2 of thickness c(pseudo)/2, with the successive layers rotated relative to each other by 90degrees. Sterically encumbered E atoms are then deleted at the interfaces between layers, followed by relaxation.