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Влияние прессования на свойства твердых растворов PbTe–PbSe

Влияние прессования на свойства твердых растворов PbTe–PbSe

Abstract

Исследовано влияние прессования на микротвердость, коэффициент Зеебека, электропроводность и подвижность носителей заряда поликристаллов твердых растворов PbTe–PbSe в области концентраций 0-5,0 мол. % PbSe при комнатной температуре. Установлено, что в прессованных образцах возрастает микротвердость, а электропроводность и подвижность носителей заряда снижаются. Отжиг прессованных образцов приводит к смене типа проводимости, снижению микропроводности, росту электропроводности и подвижности носителей заряда. Показано, что концентрационные аномалии свойств в области составов 0,5-2,0 мол. % PbSe, наблюдаемые раннее в литых образцах, и предположительно связанные с переходом к примесному континууму, имеют место в прессованных образцах. Таким образом, подтверждая факт существования концентрационного фазового перехода от слабого легирования к сильному. Influence of pressing on the microhardness, Seebeck coefficient, electrical conductivity and charge carrier mobility of the PbTe–PbSe polycrystalline solid solutions in the concentration range 0-5.0 mol. % PbSe was investigated at a room temperature. The microhardness was shown to increase in the pressed samples while the electrical conductivity and the charge carrier mobility decrease. The annealing of the pressed samples leads to the change in the conductivity type, the microhardness decrease, and an increase in the electrical conductivity and charge carrier mobility. It was shown that the concentration anomalies of the properties in the range 0.5-2.0 mol. % PbSe, which had been observed earlier in the cast samples and attributed to the transition to the impurity continuum, occurring in the pressed samples and confirm the fact of existence of the transition from diluted to concentrated solid solutions.

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Keywords

теплопроводность, электропроводность, концентрационные аномалии, коэффициент Зеебека

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green