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Reactivity of Solids最新文献

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Microstructural investigations 显微结构的调查
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80016-6
{"title":"Microstructural investigations","authors":"","doi":"10.1016/0168-7336(89)80016-6","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80016-6","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 96-98"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80016-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136845467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Three new orientations of the magnetite observed during the reduction of hematite between 700–800°C and explanation of the multiplicity of the diff 赤铁矿在700 ~ 800℃还原过程中观察到磁铁矿的三个新取向，并解释了差异的多重性
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80003-8
A. Modaressi, H. El Abdouni, J.J. Heizmann
{"title":"Three new orientations of the magnetite observed during the reduction of hematite between 700–800°C and explanation of the multiplicity of the diff","authors":"A. Modaressi,&nbsp;H. El Abdouni,&nbsp;J.J. Heizmann","doi":"10.1016/0168-7336(89)80003-8","DOIUrl":"10.1016/0168-7336(89)80003-8","url":null,"abstract":"<div><p>Three new orientations are observed during the reduction of a single crystal of hematite (α-Fe<sub>2</sub>O<sub>3</sub>) to magnetite (Fe<sub>3</sub>O<sub>4</sub>) at temperatures between 700–800°C.</p><p>The multiplicity of the orientations are discussed on the basis of the symmetries of the hematite and the magnetite.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 19-27"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80003-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83178316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Technical notes 技术注释
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80015-4
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引用次数: 0
Calendar of forthcoming events 即将举行的活动日历
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80020-8
{"title":"Calendar of forthcoming events","authors":"","doi":"10.1016/0168-7336(89)80020-8","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80020-8","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 102-104"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80020-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136845471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physics of Solid State Surfaces 固体表面物理学
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80017-8
M. Gasgnier
{"title":"Physics of Solid State Surfaces","authors":"M. Gasgnier","doi":"10.1016/0168-7336(89)80017-8","DOIUrl":"10.1016/0168-7336(89)80017-8","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 99-100"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80017-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89470684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of cationic ratio on the semiconducting and the dielectrical properties of barium metatitanate 阳离子配比对偏钛酸钡半导体及介电性能的影响
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80005-1
Marta Radecka, Mieczyslaw Rekas
{"title":"The effect of cationic ratio on the semiconducting and the dielectrical properties of barium metatitanate","authors":"Marta Radecka,&nbsp;Mieczyslaw Rekas","doi":"10.1016/0168-7336(89)80005-1","DOIUrl":"10.1016/0168-7336(89)80005-1","url":null,"abstract":"<div><p>The electrical conductivity (670–1070 K), the dielectric constant and the loss factor (240–430 K, 1 kHz) were examined for polycrystalline BaTiO<sub>3</sub> (0.99 &gt; Ba/Ti &lt; 1.01) obtained by solid state synthesis at 1720 K under <em>p</em>O<sub>2</sub> = 210 kPa. Changes in electrical properties with deviation from stoichiometry, in both cation sublattices, are consistent with the formation of acceptor centres such as V<sub>Ba</sub> and V<sub>Ti</sub>.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 43-52"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80005-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80367406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structure of amorphous ferrites of lanthanum, dysprosium, and bismuth 镧、镝和铋的非晶铁氧体结构
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80004-X
A.I. Rykov, Yu.t. Pavlukhin, N.I. Syrotina, V.V. Boldyrev
{"title":"Structure of amorphous ferrites of lanthanum, dysprosium, and bismuth","authors":"A.I. Rykov,&nbsp;Yu.t. Pavlukhin,&nbsp;N.I. Syrotina,&nbsp;V.V. Boldyrev","doi":"10.1016/0168-7336(89)80004-X","DOIUrl":"10.1016/0168-7336(89)80004-X","url":null,"abstract":"<div><p>Mechanical activation of the lanthanum, dysprosium, and bismuth morphotropic series of ferrites with perovskite structure leads to the formation of amorphous materials. Mössbauer spectra indicate lowering of the Fe<sup>3+</sup> coordination number on amorphization. X-ray diffraction reveals the changes in the short-range order of the arrangement of the heavy cations with respect to the starting crystalline samples, as well as structural differences between the amorphous ferrites. The structure of the amorphous LaFeO<sub>3</sub> can be described as quasicrystalline with trigonal-prismatic La<sup>3+</sup> configuration. Structural differences between the amorphous samples are due to distortions in the perovskite cells of the original crystal namely: an ionic misfit in DyFeO<sub>3</sub>, and covalency of the chemical bonds in BiFeO<sub>3</sub>.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 29-42"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80004-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84029828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Calorimetric determination of the superficial acidity and active sites in Ziegler-Natta catalysts Ziegler-Natta催化剂表面酸度和活性位点的量热测定
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80008-7
A. Auroux ∗, K. Bujadoux, J.C. Jannel, D. Lalart
{"title":"Calorimetric determination of the superficial acidity and active sites in Ziegler-Natta catalysts","authors":"A. Auroux ∗,&nbsp;K. Bujadoux,&nbsp;J.C. Jannel,&nbsp;D. Lalart","doi":"10.1016/0168-7336(89)80008-7","DOIUrl":"10.1016/0168-7336(89)80008-7","url":null,"abstract":"<div><p>The surface acidity and active sites of Ziegler-Natta catalysts (TiCl<sub>3</sub>, <span><math><mtext>1</mtext><mtext>3</mtext></math></span>AlCl<sub>3</sub>-MgCl<sub>2</sub>) before and after allevlation have been characterized by measuring the differential heats of adsorption of various probe molecules in the vapour phase.</p><p>The surface acidity was measured by the adsorption of acetonitrile. This probe molecule appeared to be adsorbed by all metallic sites on the surface, and the order in energetic distribution of these sites showed three populations of sites of decreasing strength which have been proposed as Al &gt; Ti &gt; Mg.</p><p>Characterization of the sites active in polymerization was done using various olefins with different steric hindrance but all inactive towards polymerization such as isobutene, <em>trans</em>-2-hexene and cyclohexene.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Pages 67-74"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80008-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89344481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advertisement to the reader 对读者的广告
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80013-0
{"title":"Advertisement to the reader","authors":"","doi":"10.1016/0168-7336(89)80013-0","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80013-0","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 1","pages":"Page 94"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80013-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136845465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface chemistry study of polymorphic varieties of mechanically treated spodumene 机械处理锂辉石多晶型品种的表面化学研究
Reactivity of Solids Pub Date : 1989-04-01 DOI: 10.1016/0168-7336(89)80006-3
R.M.Torres Sanchez, H.J. Gasalla, E. Pereira
{"title":"Surface chemistry study of polymorphic varieties of mechanically treated spodumene","authors":"R.M.Torres Sanchez,&nbsp;H.J. Gasalla,&nbsp;E. Pereira","doi":"10.1016/0168-7336(89)80006-3","DOIUrl":"10.1016/0168-7336(89)80006-3","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":0.0,"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":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79024104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
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