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    Effect of Hydrostatic Pressure on the Electrical Conductivity of Ag2HgI4 and Cu2HgI4
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (07), 1974) Shibata, Shuichi; Hoshino, Hideoki; Shimoji, Mitsuo
    The electrical conductivity of the a and ft phases of Ag2HgI4 and Cu2HgI4 has been measured as a function of hydrostatic pressure up to 3xlO8Nm~2 in the temperature range between 283 and 363 K. The activation volumes determined from the data are temperature-dependent. The results are discussed on the basis of the continuum model for the atomic transport process.
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    Effect of Hydrostatic Pressure on the Electrical Conductivity of Ag3SBr and £-Ag3SI
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Hoshino, H.; Yanagiya, H.; Shimoji, M.
    The electrical conductivity of Ag3SBr and £-Ag3SI has been measured as a function of hydro static pressure up to 3.15xlOsNm-2 in the temperature range 293 to 373 K. The activation volumes obtained at 303 K are —1.2±0.6 cm3 mol-1 for Ag3SBr and — 2.3±0.4cm3 mol-1 for /?-Ag3SI. For Ag3SBr the activation volume becomes more positive as temperature rises whereas for /3-Ag3SI it becomes more negative with increasing temperature.
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    Electrical Conductivity of Tetracyanoquinodimethane Crystals
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (3), 1972) Hurditch, R. J.; Vincent, Vera M.; Wright, J. D.
    The semiconductivity and photoconductivity of a scries of single crystals of tetracyanoquinodi- mcthanc (TCNQ) of increasing purity are discussed. Evidence for both surface and bulk extrinsic semiconduction is interpreted in terms of ionic impurities, particularly Na’TCNQ-, providing donor levels 0.8 and 1.2 eV below the conduction level. The spectral response of photoconduction is very sensitive to the concentration of these impurities, particularly on the low energy side of the singlet absorption of TCNQ. Photoconduction is discussed in terms of the effect of ionic impurities on the recombination rate of photogenerated charge carriers; mechanisms for generation of such charge carriers arc also discussed.
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    Effect of Pressure on Electrical Conductivities of Fused Alkali Metal Halides and Silver Halides
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (9), 1972) Cleaver, B.; Smedley, S. I.; Spencer, P. N.
    The electrical conductivities of the following fused salts were measured at temperatures up to 860°C and over a pressure range 1–1000 bar: the chlorides, bromides and iodides of the five alkali metals; silver chloride, silver bromide. The volumes ΔVΛ=–RT(∂ ln Λ/∂P)T were calculated to be independent of temperature for each salt. ΔVΛ was zero for the lithium halides, and increased as the ions were changed in the sequences Li+→Cs+ or Cl–→I–. The ΔVΛ values were used to find the temperature dependence of conductivity at constant density from that at constant pressure. The results are not consistent with the free volume theory, or with the hole theory of Bockris and Hooper. However, the observed trends are in qualitative accord with the Rice–Allnatt statistical theory of transport in liquids. This theory was used to calculate the conductivity of fused potassium chloride and its pressure and temperature dependence, using ionic pair correlation functions obtained in a computer-simulated ionic dynamics experiment. The results are in moderate agreement with experiment.