Reactivity of Solids最新文献

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Further investigations on the electrothermal properties of yttria-doped gallia ceramics 掺钇镓陶瓷电热性能的进一步研究
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80038-5
M.M.Abou Sekkina , E. El-Shereafy , M. Gouda , A.S. Diab
{"title":"Further investigations on the electrothermal properties of yttria-doped gallia ceramics","authors":"M.M.Abou Sekkina ,&nbsp;E. El-Shereafy ,&nbsp;M. Gouda ,&nbsp;A.S. Diab","doi":"10.1016/0168-7336(89)80038-5","DOIUrl":"10.1016/0168-7336(89)80038-5","url":null,"abstract":"<div><p>Numerous polycrystalline ceramic specimens of yttria-doped gallia, have been prepared in the solid state, have been studied by powder X-ray diffraction IR and UV spectroscopy. The electrical conductivities (D.C.) measured for various yttria contents and at various temperatures up to 150°C, and the bulk and true density, and the percentage porosity of the test samples are compared. Correlations of the results obtained have been determined. Some evidence of compound formation could be traced if prior firing had been carried out at 1350 °C, this was not the case when firing was carried out at 800°C. Doping gallia with yttria results in a decreased conductivity and an unaltered mode of conduction.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 219-223"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80038-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91432114","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: 4
The formation of titanium silicides by rapid thermal processing: an XRD and AES study 快速热处理制备硅化钛的XRD和AES研究
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80041-5
W. Bensch, W. Pamler
{"title":"The formation of titanium silicides by rapid thermal processing: an XRD and AES study","authors":"W. Bensch,&nbsp;W. Pamler","doi":"10.1016/0168-7336(89)80041-5","DOIUrl":"10.1016/0168-7336(89)80041-5","url":null,"abstract":"<div><p>X-ray diffraction and Auger depth profiling were performed to investigate the reaction of Ti thin films with single crystalline (100) Si by rapid thermal annealing under N<sub>2</sub> and Ar. Within a few seconds titanium silicides are formed at temperatures between 620 and 700°C. The silicides consist of TiSi<sub>2</sub>, TiSi and titanium-rich subsilicides like Ti<sub>5</sub>Si<sub>4</sub> and Ti<sub>5</sub>Si<sub>3</sub>. TiSi<sub>2</sub> is the metastable, poorly-conducting C49 modification. Growth of this phase takes place near the substrate interface, and the Ti-rich silicides are situated closer to the surface. The crystallites of the different silicides exhibit a strong texture. Annealing under N<sub>2</sub> leads to the formation of titanium nitrides TiN<sub><em>x</em></sub> near the surface and subsequent growth towards the suicide during prolonged thermal treatments. When the silicide and nitride reaction fronts coalesce the available Ti is consumed for these reactions. Further silicide growth can occur only via complex phase transformations.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 249-262"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80041-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84123228","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: 5
Mechanochemical phenomena of gibbsite, bayerite and boehmite by grinding 三水铝石、拜耳铝石和薄水铝石的磨矿力学化学现象
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80037-3
Takeshi Tsuchida, Norio Ichikawa
{"title":"Mechanochemical phenomena of gibbsite, bayerite and boehmite by grinding","authors":"Takeshi Tsuchida,&nbsp;Norio Ichikawa","doi":"10.1016/0168-7336(89)80037-3","DOIUrl":"10.1016/0168-7336(89)80037-3","url":null,"abstract":"<div><p>Three hydrated aluminas, gibbsite, bayerite and boehmite, were ground in air for 0.25–20 h by a planetary ball mill. The effect of grinding on their texture, structure and thermal behaviors has been examined by means of XRD, TG, DTA, SEM, IR, particle size distribution and nitrogen gas adsorption. It was found that in the initial stages of grinding (within the first 1 h), the specific surface area, <em>S</em>, had increased in the gibbsite, decreased in the bayerite and had a maximum in boehmite, and then proceeded to achieve their respective equilibrium values. These behaviors were correlated with changes in the median size, <em>d</em><sub>50</sub>, as a measure of the aggregate size of the particles. Prolonged grinding times, led to a decrease in the intensity of X-ray diffraction lines and an increase in the half-maximum line breadth. After 4 or 8 h grinding all the hydrated aluminas had been changed to the amorphous phase without mechanochemical dehydration. Moreover, the DTA endotherms attributable to the dehydration of the hydrated aluminas gradually diminished on grinding, and a set of broad endotherms appeared at about 150 or 200 °C for the amorphous phases. Whereas the transformation sequences of the unground hydrated aluminas to α-Al<sub>2</sub>O<sub>3</sub> showed gibbsite → χ → κ → α, bayerite → η → θ → α and boehmite → γ → δ → θ → α, all the amorphous phases showed the amorphous hydrated alumina → amorphous alumina → η → α and the temperature of α-transformation had been lowered by more than 200°C.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 207-217"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80037-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84129115","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: 59
Industrial news 工业新闻
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80045-2
{"title":"Industrial news","authors":"","doi":"10.1016/0168-7336(89)80045-2","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80045-2","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 294-295"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80045-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92048908","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
Non-equilibrium silver azide conductivity at high hydrostatic pressure 高静水压力下叠氮化银的非平衡电导率
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80044-0
A.E. Saprykin, G.M. Diamant, Yu.N. Sukhushin
{"title":"Non-equilibrium silver azide conductivity at high hydrostatic pressure","authors":"A.E. Saprykin,&nbsp;G.M. Diamant,&nbsp;Yu.N. Sukhushin","doi":"10.1016/0168-7336(89)80044-0","DOIUrl":"10.1016/0168-7336(89)80044-0","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 289-292"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80044-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84599752","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
Thermal decomposition of materials with layered structures: Isothermal dehydration of vermiculite single crystals in vacuum 层状结构材料的热分解:真空中蛭石单晶的等温脱水
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80043-9
V. B. Okhotnikov, I. P. Babicheva, A. V. Musicantov, T. Aleksandrova
{"title":"Thermal decomposition of materials with layered structures: Isothermal dehydration of vermiculite single crystals in vacuum","authors":"V. B. Okhotnikov, I. P. Babicheva, A. V. Musicantov, T. Aleksandrova","doi":"10.1016/0168-7336(89)80043-9","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80043-9","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"76 1","pages":"273-287"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84941614","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: 12
Glasses (rare earth-aluminium oxides) 玻璃(稀土铝氧化物)
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80048-8
{"title":"Glasses (rare earth-aluminium oxides)","authors":"","doi":"10.1016/0168-7336(89)80048-8","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80048-8","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Page 300"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80048-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92071196","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
Highlight from Eastern Europe 东欧亮点
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80046-4
{"title":"Highlight from Eastern Europe","authors":"","doi":"10.1016/0168-7336(89)80046-4","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80046-4","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 296-298"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80046-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92071195","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
Cation exchange studies on cement hydration phase: Ca5Si6O18H2·4H2O 水泥水化相Ca5Si6O18H2·4H2O的阳离子交换研究
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80039-7
N. Labhsetwar, O.P. Shrivastava
{"title":"Cation exchange studies on cement hydration phase: Ca5Si6O18H2·4H2O","authors":"N. Labhsetwar,&nbsp;O.P. Shrivastava","doi":"10.1016/0168-7336(89)80039-7","DOIUrl":"10.1016/0168-7336(89)80039-7","url":null,"abstract":"<div><p>Recently it has been established that 11 Å tobermorite (a calcium silicate hydrate, closely related to Ca<sub>5</sub>Si<sub>6</sub>O<sub>18</sub>H<sub>2</sub>·4H<sub>2</sub>O) shows remarkable ion exchange capacity for several ions in neutral and alkaline mediums. The Zn<sup>2+</sup> ⇌ Ca<sup>2+</sup> exchange data by 11 Å tobermorite in nearly neutral medium is described. A 0.92–12.8 wt.-% of zinc was achieved by placing tobermorite in dilute solutions of Zn<sup>2+</sup> (100–2000 ppm) the X-ray powder diffraction data reveal that the crystallinity of the exchanger remains intact after cation exchange. The thermodynamics of the exchange reaction has also been developed. This new ion exchanger resembles clays and zeolites in some respects.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 225-233"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80039-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79296081","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: 7
Preparation of mixed oxides in the Li-Co-O and Li-Mn-O systems by hydrolysis reactions 水解法制备Li-Co-O和Li-Mn-O混合氧化物
Reactivity of Solids Pub Date : 1989-08-01 DOI: 10.1016/0168-7336(89)80042-7
C. Barriga, A. Calero, J. Morales, J.L. Tirado
{"title":"Preparation of mixed oxides in the Li-Co-O and Li-Mn-O systems by hydrolysis reactions","authors":"C. Barriga,&nbsp;A. Calero,&nbsp;J. Morales,&nbsp;J.L. Tirado","doi":"10.1016/0168-7336(89)80042-7","DOIUrl":"10.1016/0168-7336(89)80042-7","url":null,"abstract":"<div><p>The hydrolysis of Co<sup>III</sup> and Mn<sup>III</sup> coordination compounds with 3 <em>M</em> LiOH yields different phases in the Li-Co-O and Li-Mn-O systems. The hydrolysis of Co(NH<sub>3</sub>)<sub>6</sub><sup>3+</sup> gives mixtures of LiCoO<sub>2</sub> (O3)/HCoO<sub>2</sub> as ultrafine particles. A high [OH<sup>−</sup>]/[Li<sup>+</sup>] ratio results in a higher HCoO<sub>3</sub> content. The hydrolysis of Mn(acac)<sub>3</sub> and Mn(C<sub>2</sub>O<sub>4</sub>)<sup>3−</sup><sub>3</sub> in the presence of O<sub>2</sub> gives a mixture of orthorhombic LiMnO<sub>2</sub> and a phase structurally related to LiMn<sub>2</sub>O<sub>4</sub>. The product after aging is the spinel phase that is characterized by an Mn oxidation state of less than 3.5 and an <span><math><mtext>Li</mtext><mtext>Mn</mtext></math></span> ratio higher than 0.5. The thermal behaviour of this product involves the oxidation of Mn to an oxidation state close to 3.5.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 3","pages":"Pages 263-271"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80042-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90846955","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
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