Microstructures (SEM backscattered electron images) of alloys with (a) , (b) , (c) , and (d) .
(a) X-ray powder diffraction patterns of alloys (, 3, 6, and 9) in the range from 10° to 95° and (b) lattice constant of the type-I clathrate phase plotted as a function of In content.
Portions of the quaternary phase diagram in the Ba–Ga–In–Ge system. Open circles correspond to nominal compositions of specimens investigated. The ternary phase diagram in the Ba–Ga–Ge system is referred from Ref. 11.
(Color online) Temperature dependence of (a) electrical resistivity, (b) Seebeck coefficient, (c) thermal conductivity, and (d) dimensionless figure of merit for alloys.
(Color online) Lattice thermal conductivity for alloys plotted as a function of temperature.
Ga, Ge, and In contents in the type-I clathrate compounds obtained by EDS analyses. The Ba sites are assumed to be fully occupied.
Article metrics loading...
Full text loading...