Thermoelectric Properties and n- to p-Type Conversion of Co-Doped ZrNiSn-Based Half-Heusler Alloys
Thermoelectric Properties and n- to p-Type Conversion of Co-Doped ZrNiSn-Based Half-Heusler Alloys
复制标题
DOI：
10.1007/s11664-012-2077-7
复制
发表时间：
2012-04
影响因子：
2.1
通讯作者：
Hanhui Xie;Cui Yu;B. He;T. Zhu;Xinbing Zhao
中科院分区：
文献类型：
--
作者：
Hanhui Xie;Cui Yu;B. He;T. Zhu;Xinbing Zhao
采用高效悬浮熔炼和放电等离子烧结工艺制备了Half-Heulser热电材料ZrNi 1 −yCoySn（y= 0，0.02，0.04，0.08，0.12）。X射线衍射分析和电子探针分析表明，得到了单相半Heusler化合物，没有成分偏析。在300 ~ 900 K温度范围内研究了Co掺杂对ZrNiSn基半Heusler合金电导率、Seebeck系数和热导率的影响。当Co掺杂量大于y = 0.02时，Seebeck系数从负值变为正值，表明材料的导电行为从n型向top型转变。未掺杂的ZrNiSn样品在870 K时的最大无量纲优值ZT达到0.5。
Half-Heulser thermoelectric materials ZrNi1−yCoySn (y= 0, 0.02, 0.04, 0.08, 0.12) were prepared by a time-efficient levitation melting and spark plasma sintering procedure. X-ray diffraction analysis and electron probe microanalysis showed that single-phase half-Heusler compounds without compositional segregation have been obtained. The effects of Co doping on the electrical conductivity, Seebeck coefficient, and thermal conductivity of ZrNiSn-based half-Heusler alloys have been investigated from 300 K to 900 K. The Seebeck coefficient displayed a change from negative to positive values above nominal Co doping content ofy= 0.02, indicating a transition in the conduction behavior fromn-type top-type. The maximum dimensionless figure of meritZTof undoped ZrNiSn sample reached 0.5 at 870 K.