December 13, 2019
Dariush Souri

Dariush Souri

Academic rank: Associate professor
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Education: Ph.D in فیزیک
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Faculty: science

Research

Title Crystallization kinetic of Sb–V 2 O 5–TeO 2 glasses investigated by DSC and their elastic moduli and Poisson’s ratio
Type Article
Keywords
Crystallization temperature Thermal stability Elastic moduli Differential scanningcalorimetry(DSC) Oxide glasses Amorphous materials
Journal PHYSICA B-CONDENSED MATTER
Researchers Dariush Souri

Abstract

Ternarytellurateglassesoftheform xSb–(60x)V2O5–40TeO2 (0rxr15inmol%)werepreparedby using theusualmeltquenchingmethod.Differentialscanningcalorimetry(DSC)atdifferentheating rates(φ) wasusedtothermalanalyzeandtogainmoreinsightintothethermalstability,glassforming tendency andsocalorimetricbehaviorofthepresentglasses.Theglasstransitiontemperature(Tg), the temperaturecorrespondingtotheonsetofcrystallization(Tx) andalsothecrystallizationtemperature (TCr) wereobtainedatdifferentheatingrates,toestimatethekeykineticparameterofactivationenergy of crystallization(ΔE) byusingdifferentempiricalformulas.Alsosomeotherthermalparameterssuch as thermalstabilityandglassformingtendencyweredetermined.Itwasfoundthat Tg, Tx and TCr increase withincreaseinSbcontentandalsowithincreaseinheatingrate.Moreover,Makishima– Makenzie’s theorywasemployedtoevaluatethePoisson’s ratioandelasticmoduli,indicatingastrong relation betweenelasticpropertiesandthestructureofglass.Fromthemechanicalandthermaldataand also thevaluesofoxygenmolarvolume ðVn O Þ, itwasfoundedthattheglasssystemscanbedividedinto “two compositionalregions”; so,resultsindicatethatglasseswith10rxr15(especiallyfor x¼12)are more thermalstableandstrongglasses,whichmakethemasmoreusefulandpromisingmaterialsin technological advantagesanddevicemanufacturing