摘要:
以Pb3O4、ZrO2 和TiO2 粉体为原料,利用柱面冲击波合成了单一的钙钛矿相Pb(Zr0.95Ti0.05)O3
(即PZT95/5)粉体,用X射线衍射(XRD)和X射线电子能谱(XPS)对PZT的物相、元素化学态、分子结构和
成分含量进行了表征。冲击合成粉体和制备陶瓷的XPS结果表明,除表面存在少量的吸附氧外,样品中存在
PZT结构中的Pb、Zr 和O,陶瓷的元素定量计算接近样品的配比。且冲击压缩造成PZT 中
Zr O 、Pb O 键的键长降低,引起冲击合成粉体的Pb4f、Zr3d结合能增大。利用固相合成粉体制备陶瓷
的Zr3dXPS比冲击合成粉体制备陶瓷的Zr3dXPS多2个峰,对应于少量游离ZrO2 被还原的低价锆离子。
Abstract:
BychoosingthePb3O4,ZrO2andTiO2powdersastheraw material,singleperovskitePb
(Zr0.95Ti0.05)O3(PZT95/5)powdersweresynthesizedwithacylindricalshockwaveloadingadvice.
Thephase,elementaryvalencestates,molecularstructureandcompositionofPZT95/5werecharacterizedbyX-
raydiffraction (XRD)andX-rayphotoelectronspectroscopy (XPS).TheXPSresults
showthattherearethecrystallatticesPb,ZrandOofPZTinthepowdersandceramicspreparedby
shockwave,withtheexceptionofadsorbedoxygenonthesamplesurface.Andthechemicalcompositionoftheceramicsamplesisneartheidealstoichiometricratio.
Inaddition,thebondlengthsof
Zr O , Pb O becomeshortundershockcompression,whichenlargesthebindingenergyof
Pb4fandZr3dintheshock-synthesizedpowders.TheZr3dspectraoftheceramicspreparedwithsolid-
state-synthesizedpowdershavetwopeaksmorethanthoseoftheceramicspreparedwithshocksynthesizedpowdersdo,
whichattributestothelowervalencezirconiumionfromthereducedZrO2.
下载: