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热重分析仪测量居里点示值误差的不确定度评定.docx

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热重分析仪测量居里点示值误差的不确定度评定 Title:UncertaintyEvaluationofCuriePointValueMeasurementErrorsforThermogravimetricAnalyzer Abstract: Thermogravimetricanalysis(TGA)iswidelyusedtomeasuretheCuriepointvalueofmaterials.AccuratedeterminationoftheCuriepointvalueiscrucialforunderstandingthethermalbehaviorandmagneticpropertiesofmaterials.However,themeasurementerrorsanduncertaintiesassociatedwithTGAmeasurementscansignificantlyaffectthereliabilityandreproducibilityoftheCuriepointvalue.ThispaperaimstoevaluatetheuncertaintyofCuriepointvaluemeasurementerrorsforTGAbyconsideringvarioussourcesofuncertaintiesandproposingamethodologyforuncertaintyestimation. 1.Introduction: TheCuriepointisacriticaltemperatureabovewhichcertainmaterialsundergoaphasetransitionfromaferromagneticorferrimagnetictoaparamagneticstate.TheCuriepointvalueisanessentialparameterforcharacterizingthemagneticpropertiesofmaterials.TGAisacommonlyusedtechniquetodeterminetheCuriepointvaluebymeasuringtheweightchangeofasampleasafunctionoftemperature.However,severalfactorsandsourcesoferrorscontributetotheoveralluncertaintyofCuriepointmeasurements. 2.SourcesofMeasurementErrorsandUncertainty: a)Instrumentation:TheTGAinstrumentitselfcanintroduceerrorsduetofactorssuchassensordrift,temperatureuniformity,andcalibrationaccuracy. b)SamplePreparation:Variationsinsamplesize,shape,andcompositioncanleadtomeasurementerrors. c)HeatingRate:TheheatingratecanaffecttheaccuracyoftheCuriepointdetermination,asnon-uniformheatingorrapidheatingcanintroduceerrors. d)AmbientConditions:ChangesinatmosphericpressureandhumidityduringthemeasurementcaninfluencetheCuriepointvalue. e)DataAnalysis:Thechoiceofanalysismethod,i.e.,determiningtheonsetorinflectionpoint,canaffecttheaccuracyofCuriepointdetermination. 3.MethodologyforUncertaintyEstimation: a)ExperimentalDesign:Conductaseriesofexperimentsusingdifferentsamples,heatingrates,andambientconditionstostudythevariabilityandrepeatabilityoftheCuriepointmeasurements. b)StatisticalAnalysis:Analyzethecollecteddatausingstati