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Electrical and mechanical studies on ferroelectric lithium rubidium sulphate crystals

Journal of Advanced Dielectrics 2018年第3期8卷 17-27页

作者： F.A.Najar G.B.Vakil B.Want Department of Physics University of Kashmir Srinagar 190006India Solid State Research Laboratory Department of Physics University of KashmirSrinagar 190006India

slow evaporation method was used to grow single crystals of lithium rubidium sulphate with high *** crystal X-ray diffraction analysis shows that at room temperature,the crystal belongs to a monoclinic system with the space group P21/*** physical parameters like plasma energy,Penn gap,Fermi energy and electronic polarizability have been evaluated for the grown *** relation between electronic polarizability and diamagnetic susceptibility for the crystal has been established on the basis of Kirkwood’s semiempirical *** ac conductivity and dielectric behavior of the grown crystal were systemically investigated as a function of frequency and *** title compound obeys Jonscher’s power law relations:ð(ω)=σo+Aω^(s),with exponent s<*** the conduction study,it is observed that both small and large polarons take part in conduction process,and at low temperature,both the band and hopping mechanisms are responsible for *** impedance and modulus studies,it is observed that only one conduction relaxation is observed in the crystal at low *** activation energy of the dielectric relaxation(0.41 eV)and that of the conduction(Econd¼0:43 eV)are in agreement,as a result,there is no difference among the conduction and relaxation species at high *** scanning calorimetric analysis of the crystal shows three endothermic peaks at 166℃,185℃,and 202℃,from which various thermodynamic parameters such asΔH,ΔS andΔC_(p) have been *** Vickers hardness test,we have determined the mechanical strength,and other parameters which include fracture toughness,brittleness index,yield strength,and stiffness constant for the crystal.

关键词： slow evaporation monoclinic conductivity impedance activation energy

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