20 بهمن 1401
داريوش سوري

داریوش سوری

مرتبه علمی: استاد
نشانی:
تحصیلات: دکترای تخصصی / فیزیک ماده چگال
تلفن:
دانشکده: دانشکده علوم پایه

مشخصات پژوهش

عنوان
Crystallization kinetic of Sb–V 2 O 5–TeO 2 glasses investigated by DSC and their elastic moduli and Poisson’s ratio
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Crystallization temperature Thermal stability Elastic moduli Differential scanningcalorimetry(DSC) Oxide glasses Amorphous materials
سال
2015
مجله PHYSICA B-CONDENSED MATTER
پژوهشگران داریوش سوری

چکیده

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