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Mechanical and thermal properties of single crystals of the type-I clathrate compounds and
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10.1063/1.2952004
/content/aip/journal/jap/104/1/10.1063/1.2952004
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/1/10.1063/1.2952004

Figures

Image of FIG. 1.
FIG. 1.

Three independent single-crystal elastic constants of (a) and (b) plotted as a function of temperature.

Image of FIG. 2.
FIG. 2.

Bulk, shear, and Young moduli of (a) and (b) plotted as a function of temperature.

Image of FIG. 3.
FIG. 3.

(a) Anisotropic parameter and (b) Poisson ratio of and plotted as a function of temperature.

Image of FIG. 4.
FIG. 4.

Thermal expansion of and plotted as the relative elongation with respect to the original specimen length at 300 K.

Image of FIG. 5.
FIG. 5.

Stress-strain curves for single crystals of and .

Image of FIG. 6.
FIG. 6.

(a) Schematic illustration of thermal stresses developed in the thermoelectric material in operation. Stresses that are caused by thermal expansion mismatch between the thermoelectric material (with the length and width ) and metal electrode, and stresses that are internally developed due to the temperature gradient between the heat source and sink. (b) Schematic illustration of the generation of internal shear stresses generated in the direction perpendicular to the thermal gradient due to the different thermal expansion at heat source and sink positions.

Image of FIG. 7.
FIG. 7.

Internal shear stress developed in , , and calculated as a function of temperature gradient for various specimen widths .

Tables

Generic image for table
Table I.

Dimensions of specimens used for the measurements of elastic constants and coefficients of thermal expansion.

Generic image for table
Table II.

Values of single-crystal elastic constants extrapolated to 0 K and numerical constants obtained with Eq. (1).

Generic image for table
Table III.

Values of polycrystalline elastic moduli extrapolated to 0 K and numerical constants obtained with an equation similar to Eq. (1), and values of polycrystalline elastic moduli of pure germanium measured at 1.7 K.

Generic image for table
Table IV.

Bulk modulus at 0 K, volume density of atoms, and melting temperature of and described by normalizing to the corresponding values for pure germanium. Numbers in parenthesis indicate the absolute values.

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/content/aip/journal/jap/104/1/10.1063/1.2952004
2008-07-11
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mechanical and thermal properties of single crystals of the type-I clathrate compounds Ba8Ga16Ge30 and Sr8Ga16Ge30
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/1/10.1063/1.2952004
10.1063/1.2952004
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