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首页> 外文期刊>Materials Science and Engineering >Mechanically enhanced p- and n-type Bi_2Te_3-based thermoelectric materials reprocessed from commercial ingots by ball milling and spark plasma sintering
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Mechanically enhanced p- and n-type Bi_2Te_3-based thermoelectric materials reprocessed from commercial ingots by ball milling and spark plasma sintering

机译：机械增强的p和n型Bi_2Te_3基热电材料，通过球磨和火花等离子烧结从商业铸锭中重新加工而成

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摘要

Ball milling (BM) combined with spark plasma sintering (SPS) is increasingly used for fabricating high-performance thermoelectric materials. This work was conducted to clarify the effects of BM and SPS on the electrical transport and thermoelectric properties of both p- and n-type Bi_2Te_3 based materials using commercially available p-type (Bi,Sb)_2Te_3 and n-type Bi_2(Se,Te)_3 ingots. Interestingly, it is found that BM and SPS differently affected the electrical properties of p- and n-type Bi_2Te_3-based thermoelectric materials; the dimensionless thermoelectric figure of merit (ZT) increases in p-type Bi_(0.5)Sb_(1.5)Te_3 but decreases somewhat in n-type Bi_2Te_(2.7)Se_(0.3) after BM and SPS. Hall experiments reveal the reason for this difference. Both p-type and n-type sintered materials show 2-3 times higher mechanical strength than the ingots because of microstructure refinement effect, which has been measured by using a small-sized biaxial bending test. The improved mechanical properties are in favor for device fabrication.
机译：球磨（BM）结合火花等离子体烧结（SPS）越来越多地用于制造高性能热电材料。进行这项工作以阐明BM和SPS对使用市售p型（Bi，Sb）_2Te_3和n型Bi_2（Se，Se）的p型和n型Bi_2Te_3基材料的电输运和热电性能的影响。 Te）_3锭。有趣的是，发现BM和SPS对p型和n型Bi_2Te_3基热电材料的电性能有不同的影响。在BM和SPS之后，p型Bi_（0.5）Sb_（1.5）Te_3的无量纲热电性能因数（ZT）增加，而n型Bi_2Te_（2.7）Se_（0.3）的无因次热电因数（ZT）有所降低。霍尔实验揭示了这种差异的原因。 p型和n型烧结材料均显示出比铸锭高2-3倍的机械强度，这是因为其微观结构细化效果已通过使用小尺寸双轴弯曲试验进行了测量。改善的机械性能有利于器件制造。

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