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Hydrothermal synthesis and characterization of KNbO3

資料類(lèi)型：

PDF文件

關(guān)鍵詞：

potassium niobate hydrothermal synthesis

資料大小：

839K

所屬學(xué)科：

分子表征

來(lái)源：

2009先進(jìn)纖維與聚合物材料國(guó)際學(xué)術(shù)會(huì)議（ICAFPM，10.21-10.24，上海）

簡(jiǎn)介：

Potassiumnibotates(KNbO3)withdifferentmorphologiesweresuccessfullypreparedviaahydrothermalmethodusingKOHandNb2O5asstartingmaterials.X-raydiffraction(XRD),fourier-transforminfrared(FTIR)spectraandscanningelectronmicroscopy(SEM)wereusedtocharacterizetheas-preparedsamples.ThesynthesisconditionssuchascrystallizationtemperatureandtimeaswellasKOHconcentrationwereinvestigated.Theresultsdemonstratedthatthecrystallizationandmorphologyoftheas-preparedsamplesstronglydependedonthereactivetemperatureandthestartingcomposition.WhentheKOHconcentrationis10M,themolarratioofK:Nbis200:1,thereactivetemperatureis150oC,rodKNbO3crystalswereobtained.DecreasingmolarratioofK:Nbto36:1underotherwiseidenticalreactiveconditionsleadstotheformationofrodandsomesheetcrystals.WhenthemolarratioofK:Nbwas100:1,increasedthereactivetemperatureto180oC,rod-likeKNbO3crystalsdisappearedandthesheetKNbO3crystalwaspresented.Whendecreasingthereactivetemperatureto120oC,tapercrystalsappearedandthefiberKNbO3crystalscouldbeseenwhenthemolarratioofK:Nbis54:1.

作者：

CAO Huiqun,WEI Bo, YU Bin, ZHU Meifang, LI Yaogang

上傳時(shí)間：

2010-04-15 14:27:01

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