简介：Thedielectricconstant,ε',andthedielectricloss,ε",forsomeselectedleadborateglasseswithinthefrequencyband105to107Hzandthetemperaturerange(20～50)℃weremeasured.Thedielectricdispersionandthedielectriclossabsorptionbandswereobserved,therelaxationtime,theactivationenthalpyandentropychangeofthedielectricrelaxationwerecalculated.Theresultsobtainedwerediscussedandcorrelatedtotheinternalnetworkstructureoftheglassesstudied.

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简介：Intensevisibleemissionsfromdysprosium（Dy3+）ionsdopedglassesbecameprospectivefordiversetechnologicalapplications.Inthispaper,physical,opticalandstructuralpropertiesofmagnesiumborateglassesdopedwithvariedconcentrationsofDy2O3wereexamined.Suchglassesweresynthesisedbymeltquenchingmethodandcharacterizedatroomtemperatureusingseveralanalyticaltechniques.Luminescenceandabsorptionspectra（inthevisibleregion）ofas-quenchedsampleswereusedtoevaluatethephysicalandopticalproperties.XRDpatternconfimstheamorphousstateofas-quenchedsamples.TheFouriertransforminfrared（FTIR）spectraofglassesrevealvariousbondingvibrationsassignedtodifferentfunctionalgroups.UV-vis-NIRspectradiscloseeightabsorptionbandsaccompaniedbyabandforhypersensitivetransitionpositionedat1260nm(6H15/2→6F11/2).ThevaluesofdirectandindirectopticalenergybandgapofthestudiedglassesaredecreasedwiththeincreaseofDy3+ioncontents.Thephotoluminescencespectraofallglassesundertheexcitationof380nmdisplaytwoprominentemissionbandscentredat497nm(4F9/2→6H15/2,blue)and587nm(4F9/2→6H13/2,green).Theachievedintenseluminescencefromtheproposedglasscompositionmaybebeneficialforsolidstatelaserapplications.

简介：InordertosensitizetheluminescenceofEu3+ionsinheavymetalglass,zincleadborateglasssamplescontainingvariousconcentrationsofEu3+andTb3+ionswerepreparedtostudytheTb3+toEu3+non-radiativeenergytransferphenomena.EnergylevelstructuresofTb3+andEu3+ionswereplottedtoshowtheexcitationandenergytransferroutes.EfficientenergytransferfromTb3+toEu3+wasobservedandstudiedqualitativelyintermsofdopingconcentrations.Thesensitizationturnedouttobelesseffectivethanexpected.FurtherstudiestocharacterizetheoxidationofTb3+intotetravalentstateandtoexaminethemechanismofenergytransferareproposed.

简介：新奇润滑油添加剂dodecoxyl钡硼酸盐被综合。产品被FTIR，元素的分析，thermo-gravimetric分析(TGA)，和扫描电子显微镜学(SEM)描绘。四球的测试证明到油菜籽油的添加剂的某个集中的增加能有效地增加带负担的能力(P_B价值)，穿的抵抗，和减少磨擦的能力。SEM观察证实添加剂能导致wear疤的一条减少的直径。

简介：Coppercoatingwasdepositedonthesurfaceofaluminumboratewhiskerbyanelectrolessplatingmethod.Thismethodwasusedtomodifytheinterfacialpropertyofsqueeze-castingaluminumboratewhiskerreinforced6061Almatrixcomposite.Interfaceobservationindicatesthatthespinelreaction(MgAl2O4)ishinderedbythecoppercoating,andthedifferenceininterfacialreactiondegreeaffectsthetensilepropertyandagingbehaviorofthecomposite.Forthecompositewithlessspinelreaction(MgAl2O4),itspeak-agingprocessarepostponedduetolessdepletionofmagnesium.Onthefracturesurfaceofcopper-coatedcompositedimplesandfracturesofwhiskersaremore,butonthefracturesurfaceofuncoatedcompositepull-outofwhiskersaremorethanthatonthecoatedone.Inuncoatedcompositethefracturegenerallyoriginatesfromthenear-interface-region.

简介：Er/Ybco-dopedborate-silicateglasseswithvariousYbconcentrationswerefabricatedbyhigh-temperaturesolid-reactionmethod.Thephotoluminescencespectraaround1.55μmandthevisibleupconversionspectraweremeasured.TheradiativelifetimeofEr-4I13/2,com-paredwiththemeasuredone,wasobtainedbyJudd-Ofelttheorybasedontheabsorptionspectra.ArateequationmodelforEr/Ybco-dopedsystemhasbeenestablishedbasedonthedataobtainedfromthemeasurements,includingtheabsorptionandemissio...