Titlebook: Semiconducting Lead Chalcogenides; Yu. I. Ravich,B. A. Efimova,I. A. Smirnov,L. S. St Book 1970 Springer Science+Business Media New York 1

防水

荧光

Preserve

政府

Band Structure and Scattering Mechanisms (Theory and Conclusions from Experimental Data),tal data on the properties of lead chalcogenides were scant and the calculation methods were imperfect (Bell et al. [466] used the method of cells without relativistic corrections). The results of their calculation were contradicted by later experimental data. An energy band structure which is in ag

STRIA

Adenocarcinoma

the energy spectrum of electrons is much more complex than had originally been predicted: in many cases, there are several energy bands with different parameters. It has been found that the effective carrier mass, which had been assumed to be constant for a given material, depends on the carrier en

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Electrical Properties,from the lattice periodicity), and in the case of elastic scattering the mobility in a semiconductor with a simple parabolic band is . where 〈.〉 is the average relaxation time; m* is the effective mass.

商店街

Magnetic Properties,ltrasound absorption in magnetic fields. These effects are associated with the quantization of electron states in a magnetic field or, when the quasi-classical approach is used, with the bending of the electron orbits. The galvanomagnetic and thermomagnetic effects in nonquantizing magnetic fields have already been discussed (cf. §§3.2 and 4.1).

臭名昭著

Applications of Lead Chalcogenides,1]. Later it was found that alloys based on antimony and bismuth tellurides were more suitable materials for cooling purposes. Lead chalcogenides, particularly lead telluride and its alloys, were found to be the most efficient materials for thermoelectric generators working between room temperature and 600–650°C.

一小块

Thermoelectric and Thermal Properties,c field which gives rise to a thermo-emf or the Seebeck effect. Carriers with higher energies move from the hotter to the colder parts of the sample, and those with lower energies move in the opposite direction so that the total current is equal to zero.