Browsing by Author "Pulham, Richard J."

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    Electrical Resistivity of Solutions of Germanium, Tin and Lead in Liquid Sodium
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (09), 1974) Hubberstey, Peter; Pulham, Richard J.
    The electrical resistivity of solutions of germanium (up to 1.0 atom %), tin (up to 6.9 atom %) and lead (up to 7.8 atom %) in liquid sodium have been measured over the temperature ranges 200-450, 200-400 and 100-300 C respectively. A capillary technique was used which involved circulation of the liquid metal through the capillary by use of an electromagnetic pump. For tin and lead, a plot of resistivity (/>) against concentration (c) is nearly linear with an increasingly positive dp/dc. For germanium, dp/dc, although positive, decreases slightly. All three solutes, especially tin, increase the resistance of sodium by a relatively large amount. The resistivity of the solutions increases with increasing temperature much as does that of pure sodium. Dilute solutions containing both germanium and tin in liquid sodium show additive behaviour compatible with lack of association between the two solutes.
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    Solutions of Lithium Salts in Liquid Lithium: Electrical Resistivity of Solutions of Nitride, Hydride and Deuteride
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (2), 1977) Adams, Paul F.; Down, Michael G.; Hubberstey, Peter; Pulham, Richard J.
    The electrical resistivities, ρ, of solutions of lithium nitride, lithium hydride and lithium deuteride in liquid lithium have been determined for concentrations, x, up to 2.77, 5.68 and 2.22 mol % non-metal over the temperature ranges 200–450, 257–551 and 276–500°C, respectively. For each solute, resistivity increases linearly with increasing concentration, except for very dilute solutions, and the coefficient, dρ/dx increases with increasing temperature. Nitride causes the greatest increase in resistivity [dρ/dx= 7.0 × 10–8Ωm (mol % N)–1 at 400°C], and hydride and deuteride show no detectable isotope effect [dρ/dx= 4.9 × 10–8Ωm (mol % H or D)–1 at 400°C]. The resistivities of mixtures of nitride and hydride in lithium are additive, thereby showing lack of association between these solutes. Ammonia vapour reacts with the metal to form hydride and nitride which dissolve to increase the resistivity by their characteristic amounts.