Studies regarding the homogeneity range of the zirconium phosphide telluride Zr2+δPTe2

Studies regarding the homogeneity range of the zirconium phosphide telluride Zr2+δPTe2
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关于磷化锆碲化物Zr2 δPTe2 均匀性范围的研究

DOI:
10.1016/j.solidstatesciences.2010.08.022
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发表时间:
2010
影响因子:
3.5
通讯作者:
P. Schmidt
P. Schmidt
中科院分区:
化学3区
文献类型:
--
作者:
K. Tschulik;S. Hoffmann;B. P. T. Fokwa;M. Gilleßen;P. Schmidt

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Zr2PTe2在Te2(g) + P4(g)的释放下分解,形成均匀性范围Zr2+δ pte2。Zr2+δPTe2单晶以碘为输运剂,从830℃向900℃的高温方向进行了化学气相输运。Zr2+δPTe2在菱形空间群R-3m (no。当δ = 0…1时,晶格参数a = 383(1)…386(1)PM, c = 2935(4)…2970(4)PM。测定了Zr2.40(2)PTe2的单晶数据,晶格参数a = 385.24(4) pm, c = 2967.8(4) pm。用线性松饼-锡轨道(LMTO)方法研究了Zr2+δPTe2的电子结构和化学键。Zr2PTe2和Zr3PTe2在费米能级(EF)显示出不消失的DOS值,表明金属性质。根据COHP键分析,Zr3PTe2的结构稳定性主要由杂原子Zr-P和Zr-Te键决定。Zr2PTe2中不存在的新的Zr2-Te键比Zr1-Te键更强,并且被认为是具有过量Zr的相的稳定性的原因。
The phosphide tellurides Zr2+δPTe2 (0 ≤ δ ≤ 1) can be synthesized from the elements in a solid state reaction or by thermal decomposition of Z. Zr2PTe2 decomposes under release of Te2(g) + P4(g) forming the homogeneity range Zr2+δPTe2. The growth of single crystals of Zr2+δPTe2 succeeded by chemical vapour transport using iodine as transport agent from 830 °C in direction of higher temperatures up to 900 °C. Zr2+δPTe2 crystallizes in the rhombohedral space group R-3m (no. 166) with lattice parameters a = 383(1)…386(1) pm and c = 2935(4)…2970(4) pm for δ = 0…1, respectively. Single crystal data have been determined for Zr2.40(2)PTe2 with lattice parameters a = 385.24(4) pm and c = 2967.8(4) pm. The electronic structure and chemical bonding in Zr2+δPTe2 was investigated by the linear muffin–tin orbital (LMTO) method. Both Zr2PTe2 and Zr3PTe2 show non-vanishing DOS values at the Fermi level (EF) indicating metallic character. According to COHP bonding analyses, mainly the heteroatomic Zr–P and Zr–Te bonds are responsible for the structural stability of Zr3PTe2. The new Zr2–Te bond, which is not present in Zr2PTe2, is stronger than Zr1–Te and is thought to be responsible for the stability of phases having Zr in excess.
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发表时间: 2008
影响因子: 1.8
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