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P-type polycrystalline Ba8Ga16+xGe30−y type-I clathrate compounds were grown from melts by means of the vertical Bridgman method. The composition of melts was varied to obtain ingots with three different Ga/Ge ratios. The exact composition and crystal structure of the clathrates were respectively determined by electron probe microanalysis and X-ray diffraction, while the Seebeck coefficient, electrical...
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