高温高压下硫元素对纯铁声速的影响

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1、athighpressureandtemperature．Applyinginverseimpactandopticalanalysistechnique，thesoundvelocitiesofFess．2Sl1．8weremeasuredfrom40GPato210GPa,whicharethefirstlyreporteddataaboutFe88．2S11．8．ThroughcomparisonofthesoundvelocityofFe，Fe9008S2andFes8．2Sl1．8，itisfoundthatOandShavedifferenteffectontheso

2、undvelocityofiron．TheeffectofOiSs仃ongerthanthatofS．3．ThehighpressuremeltingcurveofFess．2S11．8wasestablished．AccordingtotheabruptlychangeofsoundvelocityofFess．2S11．8．at110GPa,theequilibriummeltingtemperatureofFess．2S11．8wasabout2260Kbasedontheconservationofenergy．Referredtothispoint,themelting

3、temperaturecurvecanbecalculatedaccordingtoLindemanLaw．Comparingwiththepre-existinghighpressuremeltingcurveofFe，Fe．O，Fe．SandFe．O．S，itisfirstlyfoundthatthereislinearrelationshipbetweenthemeltingdeceaseandamountofS．AndOhaslittleeffectonthemeltingtemperatureofironhighpressure．Theaboveresultsareve

4、rysignificanttoconstrainthetemperatureprofileoftheoutercore．4．ThedensityandbulksoundvelocityofFe-SsystemintheEarth’Soutercore．AccordingtothemeasuredstateequationandthermodynamicparametersofFeandFeS，wecalculatedthedensityandsoundvelocityoftheFe-S，whichareinagreementwellwiththoseofexperimentald

5、ata．Itshowsthataboveequationsandparametersarereasonable．Thenusingthismethod，thedensityandbulksoundvelocityofFe88．2S11．8andFe90S10werecalculatedandcomparedwiththatoftheEarth’SouterCOre．ThedensityandsoundvelocityofFe90S10matchesbetterthanthatofFes8．2Sl1．8．Therefore，itfurtherprovedthatOisdeplete

6、dinouterCOre．BecausetheamountoftheSintheoutercoreCan’texcess2-3wt％．thecompositionoftheoutercoreiShighlyimpossibleFe-S·Sisystem．Keyword：Lightelements，Density，Soundvelocity，Meltingtemperature，shockWaVe目录中文摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstraet⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．III第一章外地

7、核中候选轻元素的研究意义和现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．2外地核候选轻元素的研究意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．3外地核候选轻元素的限定条件⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．41．4实验确定外地核候选轻元素的主要途径⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．51．4．1高压下测量物质的密度、声速和熔化规律⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯51．4．2用地球化学的方法对陨石以及地表样品所含轻元素的对比分析⋯91．4．3