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首页> 外文期刊>European journal of inorganic chemistry >Synthesis, structure, and thermoelectric properties of barium copper polychalcogenides with chalcogen-centered Cu clusters and Te_2~(2-) dumbbells
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Synthesis, structure, and thermoelectric properties of barium copper polychalcogenides with chalcogen-centered Cu clusters and Te_2~(2-) dumbbells

机译:以硫族元素为中心的铜团簇和Te_2〜(2-)哑铃的钡铜硫族化物的合成,结构和热电性能

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摘要

BaCu_(6-x)STe_6 and BaCu_(6-x)Se _(1-y)Te_(6+y) were synthesized from the elements at 663 K. These chalcogenides adopt a new structure type, cubic space group Pm$ar {3}$, with a = 6.9680(2) ? in the case of BaCu _(5.93)SeTe_6. Therein, the Cu atoms form cubic clusters, centered by Se atoms, where statistically 2.07 corners are unoccupied. All Te atoms are part of Te_2~(2-) dumbbells, leading to a charge-balanced formula when x = 0: Ba~(2+)(Cu~+) _6Se~(2-)(Te_2~(2-))_3. While Te atoms can be incorporated on the Se site, no evidence was found for the ability of Se atoms to replace Te in the Te_2~(2-) pairs. Band structure calculations on different BaCu_6SeTe_6 models revealed a very small band gap at the Fermi level; all these chalcogenides with x > 0 should thus be p-doped semiconductors, which we experimentally confirmed for BaCu_(5.7)Se_(0.6)Te_(6.4).
机译:由663 K元素合成BaCu_(6-x)STe_6和BaCu_(6-x)Se _(1-y)Te_(6 + y)。这些硫族化物采用新的结构类型,立方空间群Pm $ 条{3} $,其a = 6.9680(2)?如果是BaCu _(5.93)SeTe_6。其中,Cu原子形成了以Se原子为中心的立方簇,在统计上未占据2.07个角。所有Te原子都是Te_2〜(2-)哑铃的一部分,当x = 0时得出电荷平衡式:Ba〜(2 +)(Cu〜+)_6Se〜(2-)(Te_2〜(2-) )_3。尽管Te原子可以结合在Se位点上,但没有证据表明Se原子能够取代Te_2〜(2-)对中的Te。不同BaCu_6SeTe_6模型的能带结构计算显示,费米能级的带隙很小。因此,所有这些x> 0的硫族化物都应该是p掺杂的半导体,我们通过实验证实了BaCu_(5.7)Se_(0.6)Te_(6.4)。

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