{"title":"Surface chemistry study of polymorphic varieties of mechanically treated spodumene","authors":"R.M.Torres Sanchez, H.J. Gasalla, E. Pereira","doi":"10.1016/0168-7336(89)80006-3","DOIUrl":null,"url":null,"abstract":"<div><p>Samples of α- and β-spodumene treated at various milling periods were studied by X-ray photoelectron spectroscopy (XPS). Determinations of points of zero charge (PZC) were made by means of titration curves of the samples. The PZCs obtained evidenced immediate alteration of the crystalline structure at the mechanical treatment time sequences for both types of spodumene (α and β).</p><p>Aluminium and silicon distribution on the surface (up to 100 Å depth) did not show any significant differences between samples α<sub>0</sub> and β<sub>0</sub>. The lithium increase in β<sub>0</sub> has been attributed to structural differences.</p><p>Mechanical treatment caused an increase in Al<sub>2<em>p</em></sub>, Si<sub>2<em>p</em></sub> and Li<sub>1<em>s</em></sub> photoelectron peak intensities for sample α<sub>50</sub> together with a shift in Al<sub>2<em>p</em></sub> binding energy from 0.6 eV towards lower values. This has been ascribed to aluminium oxide formation on the surface.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 53-60"},"PeriodicalIF":0.0000,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80006-3","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Reactivity of Solids","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0168733689800063","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
Samples of α- and β-spodumene treated at various milling periods were studied by X-ray photoelectron spectroscopy (XPS). Determinations of points of zero charge (PZC) were made by means of titration curves of the samples. The PZCs obtained evidenced immediate alteration of the crystalline structure at the mechanical treatment time sequences for both types of spodumene (α and β).
Aluminium and silicon distribution on the surface (up to 100 Å depth) did not show any significant differences between samples α0 and β0. The lithium increase in β0 has been attributed to structural differences.
Mechanical treatment caused an increase in Al2p, Si2p and Li1s photoelectron peak intensities for sample α50 together with a shift in Al2p binding energy from 0.6 eV towards lower values. This has been ascribed to aluminium oxide formation on the surface.
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