Ceylon Journal of Science (Physical Sciences)

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    Ionic conductivity of (PeO)9 LITFSI : Al2O3 nano-composite polymer electrolyte prepared by solvent free route
    (University of Peradeniya. Peradeniya, 2002) Jayathilaka, P.A.R.D.; Dissanayake, M.A.K.L.; Albinsson, I.; Mellander, B.E.
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    Electrical relaxation in some peo-based solid polymer elctrolytes
    (University of Peradeniya. Peradeniya, 2002) Bandara, L.R.A.K.; Dissanayake, M.A.K.L.
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    Solid state electrochemical cells based on PEO-Mg(ClO4)2 polymer electrolyte and Mg/Cu electrodes
    (University of Perdeniya. Peradeniya, 1999) Bandara, L.R.A.K; Dissanayake, M.A.K.L.; Careem, M.A.; Amalashwaran, V.
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    Ferroelectrics dispersed Li2SO4 composite solid electrolyte
    (University of Peradeniya. Peradeniya, 1995) Singh, K.; Bhoga, S.S.
    The ferolectric dispersed lithium sulphate composites have been invested using complex impedance analysis. The appearance of two semicircles in the Cole-Cole plots is discussed in the light of brick wall model. The observed breakover in the Arrhenius plots within the monoclinic region is considered to be due to changover mechanism from bulk conduction (within grain) to surface percolation conduction. A considerable enhancement in conductivity due to KNbO3 is observed to be due to its ferroelectric property. The surface charge transfer mechanism at the interface is illustrated to understand the formation of a space charge layer and so the microscopic conduction process.
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    Ionic conductivity of the Na2SO4-Na2WO4 system
    (University of Peradeniya. Peradeniya, 1995) Sumathipala, H.H.; Dissanayake, M.A.K.L.; Careem, M.A.; Bandaranayake, P.W.S.K.
    In this study, the electrical conductivity of the Na2SO4-Na2WO4 system has been measured using complex impedance technique to investigate the effect of anion substitution on the cationic conductivity. In the Na2SO4(I) based solid solubility region the conductivity increases as SO4 ions are substituted by WO4 in the crystal structure. Maximum conductivity of 4x10-4 Scm-1 with an activation energy 0.5 eV at 450oC has been observed around 22 mol% Na2WO4. The secondary conductivity maximum observed at 48 mol % Na2WO4 could be associated with a two-phase mixture consisting of Na2SO4 based and Na2WO4 based solid solutions.