简介：在H2SO4-Fe2（SO4）3体系中研究载金黄铁矿的浸出动力学,探讨反应温度、Fe3＋浓度、硫酸浓度、搅拌速度等对黄铁矿浸出的影响规律。结果表明：在H2SO4-Fe2（SO4）3体系中,在30~75°C下黄铁矿浸出过程主要受化学反应控制Fe3＋浓度与黄铁矿的浸出呈正相关,通过Arrhenius经验公式求得浸出表观活化能为51.39kJ/mol。EDS与XPS分析结果表明：黄铁矿氧化过程中硫的氧化经一系列中间形态,最终被氧化成硫酸根,并伴有部分元素硫生成,符合硫代硫酸根氧化路径机理。

简介：Aseriesoftheelectrochemicalandlong-termcorrosiontestswascarriedoutina3.5wt%Na2SO4solutiononthermal-sprayedWC-17CoandWC-10Co-4Crcermetcoatingsinordertoexaminetheeffectofcompositionofbindermaterialsonthecorrosionbehavior.TheresultsrevealthattheoverallcorrosionresistanceoftheWC-17CocoatingisinferiortothatoftheWC–Co–CrcoatingsduetothecorrosionofbindermaterialswhichinduceWCparticlestofalloff.CoOandWO3oxidefilmsformonthesurfaceofWC-17CocoatinginNa2SO4solutionelectrochemicalcorrosionprocess,whichwillprotectthecoatingintheprocessofcorrosion.Cr2O3oxidefilmformedontheWC-10Co-4Crcoatingsurfacehasastronghinderedroletocorrosion.ThecorrosionmechanismofWC-17CocoatinginNa2SO4solutionisentirecorrosionofComatrix,whileitisfilm-holecorrosionmechanismforWC-10Co-4Crcoating.

简介：BasedonthetechniqueforpreparingLaCl3viadirectpyrolysisofrareearthchloridesolution,ajetpyrolysisreactorwasdesignedandtheintra-reactortemperatureandchemicalreactionswerenumericallysimulatedusingcomputationalfluiddynamics(CFD)technique.Theresultsshowthattheflowratevariationatthefuelinletdoesnotlargelyaffectthetemperatureinthereactor,whiletheincreaseinexternalpressureatthematerialinletrapidlydecreasestheaveragetemperature,Venturitemperature,andoutlettemperature.TheCH4andO2insidethereactorarecombustedcompletely,andwhenthematerialinletpressureis\90Pa,theLaCl3isfullypyrogenated.ThecontentsofCO2,La2O3,andHClfluctuateneartheVenturitubeandfinallystabilize.La2O3contentattheoutletisinatop-to-bottomgradient.

简介：1ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒａｒｅｅａｒｔｈｃｏｂａｌｔａｌｌｏｙｓｈａｖｅｔｈｅｐｏｔｅｎｔｉａｌｆｏｒｍａｋｉｎｇｔｈｅｍａｇｎｅｔｉｃａｎｄｍａｇｎｅｔｏｏｐｔｉｃａｌｍａｔｅｒｉａｌｓ.Ｓｏｆａｒ,ｔｈｅｒａｒｅｅａｒｔｈｃｏｂａｌｔａｌｌｏｙｆｉｌｍｓａｒｅｓｕｂｓｔａｎｔｉａｌｌｙｐｒｏｄｕｃｅｄｂｙｓｐｕｔｔｅｒｉｎｇｏｒｖａｃｕｕｍｐｌａｔｉｎｇ.Ｉｆｓｕｃｈｆｉｌｍｓａｒｅｐｒｅｐａｒｅｄｂｙｅｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｉｎｓｔｅａｄ,ｐｒｏｄｕｃｔｉｏｎｅｆｆｉｃｉｅｎｃｙｗｏｕｌｄｂｅｉｍｐｒｏｖｅｄａｎｄｔｈｅｃｏｍｐｏｓｉｔｉｏｎｏｆｔｈｅａｌｌｏｙｃｏｕｌｄｂｅｃｏｎｔｒｏｌｌｅｄ.Ｂｅｃａｕｓｅｔｈｅｏｘｉｄａｔｉｏｎｒｅｄｕｃｔｉｏｎｐｏｔｅｎｔｉａｌｓｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓａｒｅｖｅｒｙｎｅｇａｔｉｖｅ,ｏｒｇａｎｉｃｓｏｌｖｅｎｔｓｍａｙｂｅｕｓｅｄａｓｅｌｅｃｔｒｏｌｙｔｉｃｍｅｄｉａ.ＥｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｏｆＧｄＣｏａｎｄＳｍＣｏｉｎｏｒｇａｎｉｃｓｏｌｕｔｉｏｎｓｈａｓｂｅｅｎｒｅｐｏｒｔｅ...

简介：采用固相法制备La2O3与Sb2O3掺杂的钛酸锶钡陶瓷，研究其介电性能及相变特性。通过X射线衍射法分析体系微观结构并利用扫描电镜观察其表面微观形貌。（La,Sb）共掺杂的钛酸锶钡陶瓷具有典型的钙钛矿结构，且随着Sb2O3掺杂量的增多其平均粒径显著减小。La3＋离子以及Sb3＋离子均占据钙钛矿晶格的A位。La2O3与Sb2O3添加量的改变显著影响钛酸锶钡基陶瓷的介电常数以及介电损耗。La2O3改性的钛酸锶钡陶瓷其四方-立方相变为二级相变，且居里温度随着La2O3掺杂量的增多向低温方向移动。（La,Sb）共掺杂的钛酸锶钡陶瓷则体现为弥散相变，随着Sb2O3含量的增大而偏离居里－外斯定律越显著。由于Sb3＋离子对晶格原位离子的取代使得（La,Sb）共掺杂的钛酸锶钡陶瓷的介电常数最大值下的温度亦随着Sb2O3含量的增大而降低。

简介：［1］S.Jin,T.H.Tiefel,M.McCormack,etal.:Sci-ence,264(1994),p.413.［2］R.vonHelmolt,J.Wecker,B.Holzapfel,etal.:Phys.Rev.Lett.,71(1993),p.2331.［3］Y.Shimakawa,Y.Kubo,T.Manako:Nature,379(1996),p.53.［4］C.Zener:Phys.Rev.,82(1951),p.403.［5］A.J.Millis,P.B.Littlewood,B.I.Shraiman:Phys.Rev.Lett.,74(1995),p.5144.［6］A.J.Millis,B.I.Shraiman,R.Mueller:Phys.Rev.Lett.,77(1996),p.175.［7］D.Louca,T.Egami,E.L.Brosha,:Phys.Rev.B,56(1997),p.8475.［8］G.Zhao,K.Conder,H.Keller,etal.:Nuture,381(1996),p.676.［9］C.H.Booth,F.Bridges,G.J.Snyder,etal:Phys.Rev.B,54(1996),p.15606.［10］K.H.Kim,J.Y.Gu,H.S.Choi,etal.:Phys.Rev.Lett.,77(1996),p.1877.［11］S.Zhou,G.Zhou,Y.Zhang:Jpn.J.Appl.Phys.,38(1999),p.5075.［12］S.Tajima,A.Masaki,S.Uchida,etal.:J.Phy.C:SolidStatePhys.,20(1987),p.3469.［13］L.M.Rodriguez-Martinez,J.P.Attfield:Phys.Rev.B,58(1998),p.2426.

简介：AnewtypeofcomplexsolidsuperacidcatalystWO3-ZrO2-SO42-withanacidstrengthH0≤-16.04waspreparedbykneadingZr（OH）4oramorphousZrO2withtungsticacid（H2WO4）（W/Zr=0.15）,followedbyexposingthiscomplexhydroxidesto0.5tool/LH2SO4,calcininginairat700～800℃for3h.ThiscatalystpossessesbothstrongBronstedacidityandstrongLewisacidityexperimentallyshowedbyIRobservationofpyridineabsorbedonit.XPSandAEStechniqueswereemployedtoexaminethevalencestatesoftungsten,zirconium,sulfurandtheirinteractions.Thestructureofsulfurspecieswasstudiedbyinfraredspectroscopyandastructuremodelofactivesitewasproposedupontheseresults.

简介：ＥｌｅｃｔｒｏｃｒｙｓｔａｌｌｉｚａｔｉｏｎＭｅｃｈａｎｉｓｍｏｆＴｕｎｇｓｔｅｎｉｎＭｏｌｔｅｎＫＦ－Ｂ＿２Ｏ＿３－Ｋ＿２ＷＯ＿４ＷｅｎＺｈｅｎｈｕａｎａｎｄＬｉＧｕｏｘｕｎ文振环，李国勋（ＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｉｕｔｅｆｏｒＮｏ...

简介：Auniformtransienttemperaturefieldmodelofelectricalcontactsoperationwasfoundbyanalyzingtheprocessofclosingarc→constrictionresistanceJouleheat→breakingarc.EssentialparametersofAg/La2NiO4electricalcontactmaterialfortransienttemperaturefieldcalculationwereobtainedthroughtestsofelectricalcontactexperimentalinstrumentunder18VDCindifferentcurrents,othercorrelationexperiments,andcalculationanalysis.Thefiniteelementmethodwasappliedtosolvethetransienttemperaturefield,andthefeaturesanddistributionofthetransienttemperaturefieldwereobtained.Theconditionofmaterialerosionandmasstransfercanbeforecastedbythosecalculationresults.ItisbeneficialtoresearchaboutthelifetimeofAg/La2NiO4electricalmaterial.

简介：TheeffectofyttriaonthesolidreactionmechanismofaCaHPO4·2H2O+CaCO3systematdifferenttemperatureswasexperimentallystud-ied.Thesampleswithandwithoutyttriaweresubjectedtothermogravimetric/differentialscanningcalorimetrymeasurement.ThesampleswereheattreatedatthetemperaturescorrespondingtothepeaksontheDSCspectra,andtheresultedphasecompositionswereidentifiedbyX-raydiffraction.Thetransformationmechanismwasdeducedbycomparingthephasesobtainedatdifferenttemperatures.Theresultsshowthatthetransformationsatbelow1073Karenotaffectedbyyttria,butallthoseatabove1073Karecompletelyaltered.Theformationtem-peratureofhydroxyapatitedecreasesby134K,andthedecompositiontemperatureincreasesby38K.ThepolymorphoustransformationofCa3(PO4)2fromβphasetoαphaseincreasesby47K.Thethermodynamicpropertiesofthetransformationsatabove1073Karealsomodi-fiedbytheadditionofyttria;thatis,theendothermalpeaksaresubstitutedbyexothermalpeaks.

简介：晶体结构和加氢行为(La_(1-x)Mg_x)_3Al(x=0.1，0.2，0.3，和0.4)合金被调查。这被发现有x=的合金0.1La和第0.2consi(Mg，艾尔)，La，和一个新奇阶段。新奇阶段作为La_2Al被决定。当Mg满足增加，La_2Al的数量减少，这被显示出。当x增加到0.3时，onlyLa(Mg，艾尔)并且La_2Al的小数量存在。当x是0.4时，La_2Al阶段消失，合金包含两La(Mg，艾尔)并且La(艾尔，Mg)_2洗阶段。(La_(0.9)Mg_(0.1))_3Al并且(La_(0.7)Mg_(0.3))_3Al合金能被氢的吸收在473K分解成LaH_3，MgH_2，和La_2Al_5。

简介：Solventextractionofpalladium(Ⅱ)fromhydrochloricacidsolutionwith2-n-octyl-4-isothiazolin-3-one(OIT)/cyclohexanewasstudied.Effectsofdifferentparametersonextractionefficiencywereevaluated.99.96%and98.26%palladium(Ⅱ)couldbeeffectivelyextractedwith0.018mol·L-1OIT/cyclohexaneof0.1and4.0mol·L-1HClmedium,respectively.Nonpolarsolventandlowaciditycouldimprovetheextractingefficiency,andsuccessfullystrippalladium(Ⅱ)fromtheloadedorganicphasewasachievedwith0.5mol·L-1(NH2)2CSsolution.ItwasproposedthattheextractionofPdcomplexesfromHClmediumproceededthroughtheionassociationmechanismbyslopemethod,NMRandFT-IRspectra.

简介：Pt(Ⅱ)andPd(Ⅱ)complexeswith2',3',4',5,7-pentahydroxy-flavoneweresynthesizedandcharacterizedbyelementalanalysis,molarconductance,IR,1HNMR,TG-DTA,UV-Visspectroscopictechniques,andfluorescenceanalysis.Thescavengingeffectonthesuperoxideradical(O-2)andtheinhibitoryeffectonlipidperoxideswerealsoinvestigated.Boththeligandandthecomplexesexhibitscavengingeffectonsuperoxideradicals,andtheeffectofthecomplexesisgreaterthanthatoftheligand.ThePt(Ⅱ)complexexhibitsthestrongestscavengingefficiency.BothPt(Ⅱ)andPd(Ⅱ)complexeshavetheinhibitoryeffectonlipidperoxides,andtheeffectofthecomplexesisgreaterthanthatoftheligand,butthePt(Ⅱ)complexhasahigheffectofpromotinglipidperoxides.

简介：pH价值和Y2Y23-SiO2(Y-Si)泥浆>为Ti-6Al-4V投资扔的脸上衣的O3粉末和硅石大音阶的第五音被测量。Y-Si脸上衣系统做的壳的热行为被微分扫描热量计(DSC)调查，热gravimetric(TG)分析与集体spectrometry(MS)结合了，并且阶段转变被X光检查衍射(XRD)决定。热力量，剩余力量，线性扩大系数，和壳的穿的抵抗性能也被测试。微观结构和相互作用层的元素分发被分别地扫描电子显微镜(SEM)和精力散的分光计(版本)学习。microhardness测试者被申请microhardness。结果证明泥浆为至少60是稳定的?h。YZrO3的很小的数量低于1050被形成?普牯慭?楦汥?桴潥祲?畢?畯?敲?瑬?灡汰?畱污瑩瑡癩汥?潴愠眠摩牥挠慬獳漠?睴?楤敭獮潩慮?楤慬潴?牧癡瑩?桴潥楲獥?潆?慥档琠灹?景猠汯瑵潩獮眠?数晲牯?潨潬牧灡楨?敲潮浲污穩瑡潩?挠浯異吗？？

简介：提出一种从黑泥中回收利用钛的新工艺,该工艺包括NaOH水热转化、水洗和H2SO4浸出制备TiO2。在优化的反应条件下,即NaOH溶液浓度为50%（质量分数）、NaOH/黑泥质量比为4：1、反应温度为240°C、反应时间为1h和氧气分压为0.25MPa,钛转化率可达97.2%,主要含钛产物是Na2TiO3。非目标产物Na2TiSiO5在水洗中保持稳定,在水热反应中提高NaOH浓度可以抑制Na2TiSiO5的生成。水热产物经过水洗后,97.6%的Na^＋可以回收。含有NaOH的溶液经过浓缩之后可以回用。在较低温度下,水洗物料中96.7%的钛能被较低浓度的硫酸浸出得到钛液。利用所得钛液进一步制备合格TiO2产品。

简介：

简介：采用计时电位、SEM、XRD、EIS和Tafel等方法对比研究Pb-Ag-Nd合金在160g/LH2SO4溶液中的脉冲电流极化和恒电流极化过程中的氧化膜和析氧行为。研究结果表明：脉冲电流极化的Pb-Ag-Nd合金表面的氧化膜孔洞更少,膜层更致密。这是由于在脉冲电流极化过程中的低电流阶段析氧反应更缓和,有利于多孔氧化膜的修复,因此低电流阶段可作为氧化膜的＂修复期＂。Pb-Ag-Nd阳极在脉冲电流极化过程中表现出更低的阳极电位,这与脉冲电流极化过程中阳极更小的传荷阻抗和高过电位区间更小的Tafel斜率相对应。更低的阳�

简介：通过湿法球磨制备CoFe2O4-BaTiO3颗粒复合材料,研究材料成分和调制频率与电磁效应的关系。结果表明：电磁效应系数随着调制频率由400Hz增加到1000Hz而增加。由于CoFe2O4的电导率在400-1000Hz范围内对频率敏感,电磁效应的曲线特性而发生改变。在烧结过程中形成第三相Ba2Fe2O5,从而导致电磁效应的下降。

简介：Inthiswork,asimpleandfacileone-potoleylaminesolvothermalsyntheticmethodwasdevelopedtosynthesizeCu_2ZnSnS_4(CZTS)nanocrystals.AndtheCu_2ZnSn(S,Se)_4(CZTSSe)thinfilmswerepreparedbyselenizingCZTSnanocrystals.TheobtainedCZTSnanocrystalsandCZTSSefilmswerestudiedusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),scanningelectronmicroscopy(SEM),energy-dispersiveX-rayspectroscopy(EDX),andultraviolet–visiblespectrophotometer(UV–Vis).TEMresultsshowthatthesphere–likeCZTSnanoparticleswithdiameterbetween12and35nmarepolydispersed.XRDstudiesindicatethatthepreparedCZTSnanocrystalsformkesteritecrystalstructure,andtheCZTSSefilmswithkesteritecrystalstructurearealsoobtainedattheannealingtemperaturesof500and550°C.Inparticularafterannealingat500°Cfor20min,theCZTSSefilmexhibitsasmooth,uniform,crack-free,andlarge-grainedtopographyandpossessesCu-poorandSn-richcomposition.Moreover,itshowsstrongopticalabsorptionfromvisibletonear-infrared(IR)region,anditsopticalbandgap(Eg)isfoundtobeabout1.44eV.

简介：Li1.3Al0.3Ti1.7(PO4)3pelletssinteredwithdifferentmolefractionsofLiBO2werepreparedbysol-gelmethod.Thestructuralidentification,surfacemorphology,ionicconductivity,andactivationenergyofthepelletswerestudiedbyX-raydiffraction,scanningelectronmicroscopy,andelectrochemicalimpedancespectroscopy.TheresultsshowthatalltheLi1.3Al0.3Ti1.7(PO4)3pelletssinteredwithdifferentmolefractionsofLiBO2havesimilarX-raydiffractionpatterns.ThesinteredpelletbecomesdenserandtheboundaryandcorneroftheparticlesbecomeillegiblewiththeincreaseofLiBO2.AmongtheLi1.3Al0.3Ti1.7(PO3)4pelletssinteredwithdifferentmolefractionsofLiBO2,theonesinteredwith1mol%LiBO2showsthehighestionicconductivityof3.95×10-4S.cm-1andthelowestactivationenergyof0.2469eV.