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Hall‐effect Measurements and Transport Properties of Heterostructures in the Model System NiTe2‐Sn12Sb2Te15
Zeitschrift für anorganische und allgemeine Chemie ( IF 1.1 ) Pub Date : 2020-06-22 , DOI: 10.1002/zaac.202000224 Christina Fraunhofer 1 , Stefan Schwarzmüller 1 , James L. Gardiner 2 , G. Jeffrey Snyder 3 , Oliver Oeckler 1
Zeitschrift für anorganische und allgemeine Chemie ( IF 1.1 ) Pub Date : 2020-06-22 , DOI: 10.1002/zaac.202000224 Christina Fraunhofer 1 , Stefan Schwarzmüller 1 , James L. Gardiner 2 , G. Jeffrey Snyder 3 , Oliver Oeckler 1
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In composite materials of NaCl‐type Sn12Sb2Te15 with x equivalents of CdI2‐type NiTe2 (x = 0.2; 1; 2), both phases are stable from room temperature up to 500 °C without a significant extent of mutual doping. The thermoelectric properties of this model system, complemented by Hall measurements, show clear trends with increasing x. Both electrical and thermal conductivities increase significantly whilst Seebeck coefficients decrease due to an increase in charge carrier concentrations. The overall Figure of merit zT is slightly impaired upon heterostructuring with NiTe2. However, the good reproducibility and cyclability of the measurements renders these composites an intriguing model system to qualitatively examine the applicability of a simple single parabolic band (SPB) model based on Hall‐effect data to rather metallic heterostructures. This model is best applicable to composites with lower fractions of NiTe2 and gives the direction for tuning the charge carrier concentrations toward the optimum upon heterostructuring. These findings are in accordance with B‐factor analysis and classical effective medium theory for spheroidal precipitates.
中文翻译：
NiTe2-Sn12Sb2Te15模型系统中异质结构的霍尔效应测量和输运性质
在具有x当量的CdI 2型NiTe 2（x = 0.2; 1; 2）的NaCl型Sn 12 Sb 2 Te 15复合材料中，两相在室温至500°C的温度下都稳定，且没有明显的相互掺杂。该模型系统的热电特性，加上霍尔测量值，随着x的增加显示出明显的趋势。由于载流子浓度的增加，电导率和热导率均显着增加，而塞贝克系数则下降。NiTe 2的异质结构会稍微损害整体的品质因数zT。但是，这些测量结果具有良好的可重复性和可循环性，因此使这些复合材料成为一个有趣的模型系统，可以基于霍尔效应数据对简单的单抛物线形（SPB）模型对金属相当的异质结构的适用性进行定性研究。该模型最适用于NiTe 2含量较低的复合材料，并提供了将电荷载流子浓度朝异质结构优化的方向。这些发现符合B因子分析和球状沉淀物的经典有效介质理论。
更新日期：2020-06-22
中文翻译：
NiTe2-Sn12Sb2Te15模型系统中异质结构的霍尔效应测量和输运性质
在具有x当量的CdI 2型NiTe 2（x = 0.2; 1; 2）的NaCl型Sn 12 Sb 2 Te 15复合材料中，两相在室温至500°C的温度下都稳定，且没有明显的相互掺杂。该模型系统的热电特性，加上霍尔测量值，随着x的增加显示出明显的趋势。由于载流子浓度的增加，电导率和热导率均显着增加，而塞贝克系数则下降。NiTe 2的异质结构会稍微损害整体的品质因数zT。但是，这些测量结果具有良好的可重复性和可循环性，因此使这些复合材料成为一个有趣的模型系统，可以基于霍尔效应数据对简单的单抛物线形（SPB）模型对金属相当的异质结构的适用性进行定性研究。该模型最适用于NiTe 2含量较低的复合材料，并提供了将电荷载流子浓度朝异质结构优化的方向。这些发现符合B因子分析和球状沉淀物的经典有效介质理论。
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