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- Author or Editor: M. El-Osairy x
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The method of determining the thermal conductivity depends upon a relation between the maximum temperature (θ m ) attained for a given current and potential difference (V) in a current carrying specimen. Heat is assumed to enter and leave specimen only through the surfaces through which electric current enters and leaves, other surfaces being insulated against flow of both heat and electricity. The plane ends of the rod were taken to be isothermal and equipotential surfaces held at a constant temperature.
Accurate data are presented on the behaviour of the thermal conductivity K as a function of temperature for a pure Ni sample near its Curie point. Previous results on the electrical resistivity (ϱ, dϱ/dT are used to explain the temperature-dependence ofK(T). The results are analysed in terms of electron-phonon ands- d exchange interactions. The critical behaviour of the thermal resistivityW(=K−1) has also been investigated.
A specific heat study of (Li1−xKx)2SO4 — LKS — mixed crystals has been made in a wide concentration rangex covering the temperature range 300–800 K. The phase diagram was determined. It is shown that a variation of the Li+:K+ concentration changes the critical behaviour of the specific heat. The results are discussed in terms of scattering mechanisms of energy carriers.
