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1、ElectrochimicaActa.1972.Vol.17,pp.1261to1283.PaxamonPress.PrintedinNot-themIrelandHIGH-TEMPERATUREPOTENTIAL/pHDIAGRAMSFORTHEIRON-WATERANDIRON-WATER-SULPHURSYSTEMS*R.J.BIERNATandR.G.ROBINSSchoolofChemicalEngineering,TheUniversityofNewSouthWales,Kensington,N.S.W.,AustrahaAbstra
2、ct-Potential/pHdiagramsarepresentedfortheiron-watersystemandtheiron-water-sulphursystemattemperaturesof25,100,150,200and300°C.ThethermodynamiccalculationsinvolvedinderivingthesediagramsmakeuseoftheCorrespondencePrincipleofCrissandCobbletogetherwithsomethermodynamicdatarecentl
3、yrevisedbytheNationalBureauofStandards.’R&om&-Diagrammespotentiel/pHdessysttmesfer-eauetfer-eau-soufrepourlestempCraturesde25,100,150,200et300°C.LescalculsthermodynamiquesquesollicitentcesdiagrammesutilisentconjointementleprincipedeCorrespondancedeCrissetCobbleetdesdonneesthe
4、rmodynamiques&emmentr&is&esparleNationalBureauofStandards.Znsammenfassung-EswerdenPotential/pH-DiagrammefiirdieSystemeEisen-WasserundEisen-Wasser-SchwefelbeiTemperaturenvon25,100,150,200und300°Cveriilfentlicht.DiebeiderAbleitungdieserDiagrammeangewandtenthermodynamischenBerec
5、hnungensttitzensichaufdasKorrespondenz-P&zipvonCrissundCobblesowieaufthermodynamischeDaten,diektirzlichdurchdasNationalBureauofStandardsveroffentlichtwurden.INTRODUCTIONPOTENTIAL&Hdiagramscanbederivedfortemperaturesupto300°Cbyamethodpreviouslyoutlinedbytheauthor9forthesulphur
6、-watersystem.ThismethodisbasedlargelyontheEntropyCorrespondencePrincipleofCrissandCobble,3whichenablesanestimateofthepartialmolalheatcapacityofionsinhightemperatureaqueoussolutiontobemade.Theuseofpotential/pHdiagramsforrepresentingequilibriumconditionsinaqueoussolutionhasincr
7、easedrapidlysincethepublicationbyPourbaix4of“AtlasofElectrochemicalEquilibriainAqueousSolution”.Thisatlascontainsdiagramsfortheiron-watersystemat25”C,andseveralotherauthorsincludingGarrelsandChrist6andHemShavefurtherdevelopedpotential/pHdiagramsfortheiron-watersystemat25°C.Po
8、tential/pHdiagramsfortheiron-water-sulphursystemat25°Carealsotobefou
