Thermopower and resistivity in the study of continuous phase transitions

Ramesh, TG and Shubha, V (1994) Thermopower and resistivity in the study of continuous phase transitions. In: Proceedings of the National Conference on High Pressure Science and Technology, 10-11 Oct 1994, Bangalore, India.

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    Abstract

    The electrical resistivity and absolute thermoelectric power of nickel have been measured as a function of pressure and temperature over the range 30-200c and 0-30 kbar . I n contrast to several recent investigations, we observe well defined anomalies in both resistivity and thermopower near kbar at ambient temperature. The magnitude of the anomaly decreases in temperature.Extensive studies employing several liquid pressure transmitting media like silicon oil of different viscosity grades (5st and 150 st) and n-pentane have conclusively established that the anmolies in the transfort properties are genuine and do not arise due to any artefacts connected with the changes in the pressure transmitting medium. the present experimental findings correlate well with the anomaly in the linear compressibility near 10 kbar, first observed by Bridgman. We believe that these studies provide new evidence for the existence of a pressure that the anomalies in the physical properties near 10 kbar at ambient temperature are related to polarity fluctuations between close lying 3ds 4s2 and 3ds4s1 configurations of Ni pseudo atom in the lattice. 13;

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Thermopower;Electrical resistivity;Pressure;Temperature
    Subjects: PHYSICS
    Division/Department: Materials Science Division, Materials Science Division
    Depositing User: M/S ICAST NAL
    Date Deposited: 23 Jul 2008
    Last Modified: 17 Jun 2010 13:49
    URI: http://nal-ir.nal.res.in/id/eprint/4885

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