Conductivity of dust-laden gases

Photoconductivity of additively-coloured alkali halide crystals

“…The diffusion experiment of Jain and Parasher (1964) does not support the mechanism of vacancy movement giving rise to this excess conductivity. The analysis of electrical conduction in dust-laden gases by Sodha (1968) and Sodha et al (1965) was applied by Guha (1 968) to investigate the dependence of electrical conductivity of additivelycoloured KCl crystals on the various relevant parameters ; the analytical results of Guha (1968) agreed with the experiments of Jain and Sootha (1968) within a factor of 20-70, but the nature of the variation of electrical conductivity with temperature was very well explained. In the present investigation the author has applied the analysis of Guha and Kaw (1 968) for the photoelectric enhancement of electrical conductivity in dust-laden gases to the investigation of the photoconductivity in additively-coloured alkali halide crystals ; numerical results have been presented for NaCl and KCl.…”

“…The mobility of electrons in a polar crystal is given by Petritz and Scanlon (1955) Using the results of Sodha et al (1965) it may be seen that for all cases of interest the scattering of electrons by the charged metallic colloids is negligible.…”

Electronic conductivity of additively-coloured alkali halide crystals

“…Petritz and Scanlon ( 1955) have reviewed the various theories of mobility of electrons in where ao=fi2/Mze2, 0 is the Debye temperature of the crystal, E and EO are the static and high-frequency dielectric constants of the crystal, m* is the effective mass of the electron in the crystal, z = O/T and xo(z)= 1 when z < l xo(i) = $ ( ~z ) ~/ 2 when i> 1. Using the results of Sodha et al (1965), it may be seen that for all cases of interest the scattering of electrons by the charged metallic colloids is negligible.…”

“…Although these arguments do not clinch the issue, the electronic nature of the conductivity appears to be the most plausible explanation for the excess conductivity in additively-coloured crystals. This paper presents an analysis of this phenomenon, which makes use of the work of Einbinder (1957), Smith (1958, and Sodha et al (1965) on the conductivity of dust-laden gases.…”

Field emission from negatively charged solid particles

“…The study of the emission of electrons from charged dust particles has assumed considerable importance in recent years because of its possible applications, such as the enhancement of the electrical conductivity of gases for magnetohydrodynamic power generation (Sodha and Bendor 1964, Sodha et al 1965, Honma and Fushimi 1966, Newby 1967, Guha and Kaw 1968, investigation of the electromagnetic properties of rocket exhausts (So0 1963, Sodha et al 1963, Gibson 1966, Biasi et al 1966, and other related phenomena.…”