Synthesis, structure, and properties of the electron-poor II-V semiconductor ZnAs.

Synthesis, structure, and properties of the electron-poor II-V semiconductor ZnAs.
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贫电子II-V族半导体ZnAs的合成、结构和性能

DOI:
10.1021/ic501308q
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发表时间:
2014
影响因子:
4.6
通讯作者:
U. Häussermann
U. Häussermann
中科院分区:
化学2区
文献类型:
--
作者:
A. Fischer;D. Eklöf;D. E. Benson;E.-W. Scheidt;W. Scherer;U. Häussermann

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采用多砧高压技术在6 GPa和1273 K下合成了ZnAs晶体,并通过单晶和粉末X射线衍射对其结构进行了表征(空间群Pbca(No.61),a= 5.6768(2)B= 7.2796(2),c= 7.5593(2),Z= 8)。该化合物与ZnSb(CdSb型)同构,并显示多中心键合的菱形环Zn 2As 2,它们通过经典的双中心,双电子键相互连接。在常压下,ZnAs相对于Zn 3As 2和ZnAs 2是亚稳态的。当以10 K/min的速率加热时,分解发生在700 K。漫反射测量揭示了0.9 eV的带隙。电阻率,热电,和热导率进行了测量,在2-400 K的温度范围内,并比较热电ZnSb。室温下电阻率和热电势分别为1.01 Ω cm和+27 μV/K。与ZnSb相比,这些值分别显著更高和更低。在150 K以上,热导率达到较低的值,约为2 W/m·K,这与ZnSb的热导率相似。在2 ~ 300 K之间测量了ZnAs的热容,并将其分为德拜和爱因斯坦两个贡献,温度分别为θD= 234 K,θE1= 95 K和θE2= 353 K。ZnSb和ZnAs的热容量和热导率表现出非常相似的特征,这可能与它们共同的贫电子成键性质有关。
ZnAs was synthesized at 6 GPa and 1273 K utilizing multianvil high-pressure techniques and structurally characterized by single-crystal and powder X-ray diffraction (space groupPbca(No. 61),a= 5.6768(2) Å,b= 7.2796(2) Å,c= 7.5593(2) Å,Z= 8). The compound is isostructural to ZnSb (CdSb type) and displays multicenter bonded rhomboid rings Zn2As2, which are connected to each other by classical two-center, two-electron bonds. At ambient pressure ZnAs is metastable with respect to Zn3As2and ZnAs2. When heating at a rate of 10 K/min decomposition takes place at ∼700 K. Diffuse reflectance measurements reveal a band gap of 0.9 eV. Electrical resistivity, thermopower, and thermal conductivity were measured in the temperature range of 2–400 K and compared to thermoelectric ZnSb. The room temperature values of the resistivity and thermopower are ∼1 Ω cm and +27 μV/K, respectively. These values are considerably higher and lower, respectively, compared to ZnSb. Above 150 K the thermal conductivity attains low values, around 2 W/m·K, which is similar to that of ZnSb. The heat capacity of ZnAs was measured between 2 and 300 K and partitioned into a Debye and two Einstein contributions with temperatures of θD= 234 K, θE1= 95 K, and θE2= 353 K. Heat capacity and thermal conductivity of ZnSb and ZnAs show very similar features, which possibly relates to their common electron-poor bonding properties.
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发表时间: 2009-07
影响因子: 3.2
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发表时间: 1961
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