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1、SCIENCECHINAEarthSciences•RESEARCHPAPER•January2017Vol.60No.1:114–123doi:10.1007/s11430-015-0232-4EvaluationofPtandAupressurescalesbasedonMgOabsolutepressurescale1,2*1WUZhongQing&LINFeng1LaboratoryofSeismologyandPhysicsofEarth’sInterior,SchoolofEarthandSpaceSciences,UniversityofSc
2、ienceandTechnologyofChina,Hefei230026,China;2NationalGeophysicalObservatory,Mengcheng233527,ChinaReceivedFebruary20,2016;acceptedSeptember1,2016;publishedonlineOctober28,2016Abstract Theequationsofstate(EOSs)ofMgOproducedbytwoindependentscale-freemethods,(1)thesimultaneouselast
3、icwavevelocityandinsitusynchrotronX-raymeasurements(Konoetal.,2010;Lietal.,2006)and(2)thefirst-principlescalculations(Wuetal.,2008),agreewellwitheachothertoatleast150GPaand2000K.Furthermore,theEOSfromfirst-principlescalculationsalsoagreeswellwithshockwavedata,anotherpressure-scale
4、-freedata.TheseagreementsstronglysupportthattheseEOSsprovidereliableabsolutepressurescales.HereweevaluateAuandPtEOSsbasedontheEOSofWuetal.(2008)usingthesimultaneouslymeasuredvolumedataofMgO,Au,andPtfromtheliterature.TheprimarypressurescalesdevelopedbyTangeetal.(2009)andYokooetal.(
5、2009)usingonlypressure-scale-freeexperimentaldataofMgO,Au,andPtproduceinternalconsistentpressureandagreewithEOSofWuetal.(2008).TheAuEOSbyTsuchiya(2003)workswellatroomtemperaturebutunderestimatespressureathightemperature.TheAuEOSbyFeietal.(2007)canwelldescribethermalpressure.TheEOS
6、sofPtbyHolmesetal.(1989)andOnoetal.(2011)workwellatbothroomtemperatureandhightemperature.Theresultsalsosuggestthatthediscrepancybetweenbulkmodulusofironfromexperiments(Maoetal.,1990)andthosefromEarth’score(DziewonskiandAnderson,1981)isnotoriginatedfromtheoverestimationofpressureby
7、theEOSofHolmesetal.(1989).Athighpressureandtemperature,pressureuncertaintyresultedfromvolumeerrorbecomessimilarlyimportantastheaccuracyofthepressurescale.Keywords P-Vrelation,abinitiocalculation,Pressurestandard,ClapeyronslopeCitation:WuZQ,LinF.2017.EvaluationofPtandAupressures
8、calesbasedonMgOabsolutepressuresc
