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Room temperature Young's modulus, shear modulus, Poisson's ratio and hardness of PbTe-PbS thermoelectric materials

机译:PbTe-PbS热电材料的室温杨氏模量,剪切模量,泊松比和硬度

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摘要

Two-phase PbTe-PbS materials, in which PbS is a nanostructured phase, are promising thermoelectric materials for the direct conversion of heat energy into electricity. In this study, a Vickers indentation mean hardness of 1.18 ± 0.09 GPa was measured for hot pressed specimens Pb_(0.95)Sn_(0.05)Te-PbS 8% while the mean hardness of cast specimens was 0.68 ± 0.07 GPa. The mean fracture toughness of the not pressed specimens was estimated as 0.35 ± 0.04MPa m~(1/2) via Vickers indentation. Resonant Ultrasound Spec-troscopy (RUS) measurements on hot pressed specimens gave mean values of Young's modulus, shear modulus and Poisson's ratio of 53.1 GPa, 21.4GPa and 0.245, respectively while for the cast specimens the Young's and shear moduli were about 10% lower than for the hot pressed, with a mean value of Poisson's ratio of 0.245. The differences between the hardness and elastic moduli values for the cast and hot pressed specimens are discussed.
机译:两相PbTe-PbS材料(其中PbS是纳米结构相)是有前途的热电材料,可将热能直接转化为电能。在这项研究中,测得的热压试样Pb_(0.95)Sn_(0.05)Te-PbS 8%的维氏压痕平均硬度为1.18±0.09 GPa,铸造试样的平均硬度为0.68±0.07 GPa。通过维氏压痕估计未压制样品的平均断裂韧性为0.35±0.04MPa m〜(1/2)。在热压样品上进行的共振超声光谱(RUS)测量得出的杨氏模量,剪切模量和泊松比的平均值分别为53.1 GPa,21.4GPa和0.245,而铸造样品的杨氏模量和剪切模量降低了约10%与热压相比,泊松比的平均值为0.245。讨论了铸造和热压试样的硬度和弹性模量值之间的差异。

著录项

  • 来源
    《Materials Science and Engineering》 |2010年第3期|P.58-66|共9页
  • 作者单位

    Chemical Engineering and Materials Science Department, Michigan State University, East Lansing, MI 48824, USA;

    rnChemical Engineering and Materials Science Department, Room 2527 Engineering Building, Michigan State University, East Lansing, MI 48824-1226, USA;

    rnChemical Engineering and Materials Science Department, Michigan State University, East Lansing, MI 48824, USA;

    rnChemical Engineering and Materials Science Department, Michigan State University, East Lansing, MI 48824, USA;

    Electrical and Computer Engineering Department, Michigan State University, East Lansing, MI 48824, USA;

    rnElectrical and Computer Engineering Department, Michigan State University, East Lansing, MI 48824, USA;

    Mechanical Engineering Department, Michigan State University, East Lansing, MI 48824, USA;

    Department of Chemistry, Northwestern University, Evanston, IL, USA;

    rnDepartment of Chemistry, Northwestern University, Evanston, IL, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    thermoelectric; lead telluride; powder processing; elasticity; hardness;

    机译:热电碲化铅粉末加工;弹性;硬度;

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