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

被引：93
作者：
Ni, Jennifer E. [1 ]
Case, Eldon D. [1 ]
Khabir, Kristen N. [1 ]
Stewart, Ryan C. [1 ]
Wu, Chun-I. [2 ]
Hogan, Timothy P. [2 ]
Timm, Edward J. [3 ]
Girard, Steven N. [4 ]
Kanatzidis, Mercouri G. [4 ]
机构：
[1] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA
[2] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA
[3] Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA
[4] Northwestern Univ, Dept Chem, Evanston, IL USA
来源：
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2010年 / 170卷 / 1-3期
关键词：
Thermoelectric; Lead telluride; Powder processing; Elasticity; Hardness; MECHANICAL-PROPERTIES; GRAIN-SIZE; ELASTIC-MODULI; FRACTURE-TOUGHNESS; CRACK INITIATION; INDENTATION; MICROHARDNESS; NANOINDENTATION; AGPBMSBTE2+M; MICROCRACKS;
D O I：
10.1016/j.mseb.2010.02.026
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 Pb0.95Sn0.05Te-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 +/- 0.04 MPa m(1/2) via Vickers indentation. Resonant Ultrasound Spectroscopy (RUS) measurements on hot pressed specimens gave mean values of Young's modulus, shear modulus and Poisson's ratio of 53.1 GPa, 21.4 GPa 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. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：58 / 66
页数：9
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