ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Electrical conductivity, σ, Seebeck coefficient, S, measurements on the pressed solid pellets of both Tl2OCl2 and Tl4Cl6 have been carried out in the temperature range 300 to 580 K. Both log a and S against T −1 plots have two linear regions with a break at temperature T B and T′ B for both solids. T′ B has been found to few degrees less than T B, which has been shown due to the experimental condition employed in the measurement of σ and S. These solids are electronic conductors with relatively high conductivity. The conduction above T B, results due to thermal excitation of electrons from valence to conduction band. The energy band gap for Tl2OCl2 and Tl4Cl6 have been found to be 1.38 and 1.68 eV, respectively. Below T B, the hopping of electrons from Tl+1 to Tl+3 becomes the dominant conduction mechanism. The estimated values of mobility in this range for both the solids are of the order of 10−6 m2 V −1sec−1.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00544160
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