Open AccessStructure-Property Correlation in Ir Transparent Zinc Sulphide (Zns) Ceramics Under Chemical Vapour Deposited & Hot Iso-Statically Pressed Conditions
Publication year - 2019
Publication title -
advances in materials science and engineering
Language(s) - English
Resource type - Journals
ISSN - 2578-7217
DOI - 10.33140/jamser.03.02.04
Subject(s) - materials science , microstructure , grain boundary , ceramic , dielectric , grain size , arrhenius equation , composite material , dielectric spectroscopy , analytical chemistry (journal) , mineralogy , activation energy , electrode , optoelectronics , chemistry , organic chemistry , electrochemistry , chromatography
IR Transparent ZnS ceramics processed through chemical vapour deposition were subjected to Hot Isostatic pressingand the samples in both the conditions were characterized by XRD, microstructure and high temperature impedancespectroscopic studies for the dielectric and electrical properties. Both the samples have shown cubic sphalerite phasewith enhanced orientation along (111) plane as a result of hot isostatic pressing as revealed by XRD.HIP treatment toZnS facilitated the enhancement of the homogeneity of microstructure and enhancement in the grain size from 10μm to50μm. The electrical behavior of both the samples was investigated by AC impedance spectroscopy in the frequencyrange 1Hz to 1MHz from RT to 500°C in dry air. HIP has resulted in a significant increase in the dielectric constant,which can be attributed to the increase in homogeneity and the grain size. Further, the complex impedance plotsexhibited two impedance semicircles identified in the frequency range is explained by the grain and grain boundaryeffects. An equivalent-circuit analysis of AC impedance spectra based on the brick-layer model was performed.Activation energies obtained from the conductivity plots indicates an Arrhenius type thermally activated process.