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Pressure-tuned colossal improvement of thermoelectric efficiency of PbTe
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Sample in the high-pressure anvil cell. (1) Sample ; (2) lithographic stone gasket, which serves also as a pressure-transmitting medium; (3) synthetic diamond anvils insets; and (4) supporting hard-alloy matrices (plungers). A ringlike bulge of the gasket 2 provides a supporting pressure (up to ) around the tips of the anvils. High quasihydrostatic pressure is produced in the central part of the gasket (Ref. 25). The arrows show the acting forces.

Image of FIG. 2.
FIG. 2.

(Color online) Pressure dependencies of the thermoelectric power (left scale) and the electrical resistance (a, right scale and b, at the insert) of PbS (a, 1), PbSe (a, 2), and PbTe compounds (b) at . (b) 1 and , for the first and the second run, respectively (after the first run it has become already of type because of “doping” with defects); 2, ; 3, , and 4, .

Image of FIG. 3.
FIG. 3.

(Color online) Pressure dependencies of a relative change of the thermoelectric efficiencies æ [normalized by ] at of the PbTe compounds (1 and , for the first and the second run, respectively; 2, ; 3, , and 4, ). After a -cycle-induced inversion in [Fig. 2(b)], the effect dropped by a factor of approximately four times (1 and ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pressure-tuned colossal improvement of thermoelectric efficiency of PbTe