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    Pippard relations close to the melting point in the premelting region of hexadecane
    (2012) Yurtseven, Hamit; Tilki, Özcan; Kurt, Mustafa
    We examine here the validity of the Pippard relations close to the melting point in the premelting region of hexadecane. For this verification, we analyze the observed data for the thermal expansivity ? p obtained for various pressures at constant temperatures of 302 and 325 K in this system. By calculating the isothermal compressibility T and the specific heat C p in the same pressure region of the premelting region of hexadecane, we obtain that C p varies linearly with ? p and also that ? p varies linearly with T for this system. This indicat es that some molecular organic compounds, such as solid hexadecane studied here, can exhibit -phase transitions prior to melting which are expected to verify the Pippard relations. © 2012 Hamit Yurtseven et al.
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    Öğe
    Temperature Dependence of the Tilt Angle for the Smectic A-Smectic C* Transition in a Mixture of C7-70PDOB Ferroelectric Liquid Crystals near the Tricritical Point
    (Hindawi Ltd, 2012) Kurt, Mustafa; Yurtseven, Hamit
    The temperature dependence of the tilt angle theta is studied in the smectic C* phase near the smectic A-smectic C* tricritical point for a mixture of 70PD0B in the ferroelectric liquid crystal C7 (X = 16.92). The mean-field models with the biquadratic P-2 theta(2) (P is the spontaneous polarization) and P-2 theta(2) + P theta (bilinear) coupling terms in the free energy expansion are used to analyze the experimental data for the tilt angle in this binary mixture. From our analysis, the coefficients given in the free energy expansion of the mean-field models are determined. Our results show that the mean-field theory explains adequately the observed behaviour of the C7-70PD0B mixture near the AC* tricritical point.