Composition and properties of compounds in the PbSe-Bi2Se3 system
To identify the compounds existing in the PbSe-Bi 2 Se 3 system, Bridgman-grown ingots and annealed polycrystalline samples have been characterized by X-ray diffraction. The results indicate that the first solidified portion of the Bridgman-grown ingots consists of a PbSe-based solid solution with a...
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Veröffentlicht in: | Inorganic materials 2010-02, Vol.46 (2), p.120-126 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | To identify the compounds existing in the PbSe-Bi
2
Se
3
system, Bridgman-grown ingots and annealed polycrystalline samples have been characterized by X-ray diffraction. The results indicate that the first solidified portion of the Bridgman-grown ingots consists of a PbSe-based solid solution with a cubic structure. Further directional solidification involves peritectic reactions that lead to the formation of the ternary compounds Pb
5
Bi
6
Se
14
and Pb
5
Bi
12
Se
23
, which have monoclinic structures. The structural data have been used to refine the phase diagram of the PbSe-Bi
2
Se
3
system. The thermoelectric properties of Pb
5
Bi
6
Se
14
, Pb
5
Bi
12
Se
23
, and Pb5Bi18Se32 have been studied using annealed polycrystalline samples. Their Hall coefficient and resistivity have been measured in the temperature range 80–670 K, and their thermoelectric power, electrical conductivity, and thermal conductivity have been measured from 80 to 370 K. The ternary compounds in the PbSe-Bi
2
Se
3
system have low lattice thermal conductivity, which can be understood in terms of the key features of their crystal structure. |
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ISSN: | 0020-1685 1608-3172 |
DOI: | 10.1134/S0020168510020068 |