Powder XRD patterns of prepared by HPHT together with the literature data (Ref. 18).
SEM photograph of fracture surface of the synthesized by HPHT.
The dependence of Seebeck coefficient and electrical conductivity of prepared by HPHT on temperature.
The power factor of the HPHT synthesized compared with that of the samples synthesized at normal pressure (Refs. 7 and 8).
Temperature-dependent thermal conductivity of the HPHT synthesized .
Figure of merit of compared to that of the sample prepared at normal pressure (Ref. 20).
High pressure in situ measurement of the electrical conductivity of .
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