Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80052-X
François Morin
Electrical conductivity is a very convenient means for determining chemical diffusivity in transition metal compounds. Misinterpretation may however occur about its actual significance in such nonequilibrium measurements. A detailed analysis is provided here about the application of electrical conductivity and the development of specific diffusion models in regard to Wagner's theory. One major exception is the simultaneous diffusion of both cations and anions within their respective sublattices. Results on two typical oxides, TiO2 and CoO, are briefly discussed.
{"title":"Application of electrical conductivity for determining the chemical diffusivity in transition-metal compounds","authors":"François Morin","doi":"10.1016/0168-7336(89)80052-X","DOIUrl":"10.1016/0168-7336(89)80052-X","url":null,"abstract":"<div><p>Electrical conductivity is a very convenient means for determining chemical diffusivity in transition metal compounds. Misinterpretation may however occur about its actual significance in such nonequilibrium measurements. A detailed analysis is provided here about the application of electrical conductivity and the development of specific diffusion models in regard to Wagner's theory. One major exception is the simultaneous diffusion of both cations and anions within their respective sublattices. Results on two typical oxides, TiO<sub>2</sub> and CoO, are briefly discussed.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 307-323"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80052-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86968054","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80057-9
V.L. Solozhenko
The changes in the reactivity associated with a solid that is near its polymorphic transition point are useful in developing a deeper insight into the mechanism of solid-state reactions.
当固体接近其多态转变点时，反应性的变化有助于深入了解固态反应的机理。
{"title":"Reactivity of the wurtzitic boron nitride at phase transition","authors":"V.L. Solozhenko","doi":"10.1016/0168-7336(89)80057-9","DOIUrl":"10.1016/0168-7336(89)80057-9","url":null,"abstract":"<div><p>The changes in the reactivity associated with a solid that is near its polymorphic transition point are useful in developing a deeper insight into the mechanism of solid-state reactions.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 371-374"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80057-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86590029","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80060-9
F. Adam, F. Jeannot, B. Dupré, C. Gleitzer
The cracking of hematite crystals during their low-temperature reduction to magnetite raises the question of the analysis of sigmoidal kinetic curves after an induction period which may be prolonged.
We have recorded such curves with CO/CO2 = from 350 to 600 °C, and used different models: - the classical Shrinking Core Model which should apply only at 600 ° C and not below, - the Crackling Core Model, except for at the beginning of reaction.
Surprisingly these models each yield values for the rate constant and its activation energy which are in reasonable agreement.
{"title":"Kinetics of the cracking reduction of hematite","authors":"F. Adam, F. Jeannot, B. Dupré, C. Gleitzer","doi":"10.1016/0168-7336(89)80060-9","DOIUrl":"10.1016/0168-7336(89)80060-9","url":null,"abstract":"<div><p>The cracking of hematite crystals during their low-temperature reduction to magnetite raises the question of the analysis of sigmoidal kinetic curves after an induction period which may be prolonged.</p><p>We have recorded such curves with CO/CO<sub>2</sub> = <span><math><mtext>20</mtext><mtext>80</mtext></math></span> from 350 to 600 °C, and used different models: - the classical Shrinking Core Model which should apply only at 600 ° C and not below, - the Crackling Core Model, except for at the beginning of reaction.</p><p>Surprisingly these models each yield values for the rate constant and its activation energy which are in reasonable agreement.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 399-408"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80060-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83530482","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80054-3
Jutang Sun, Xiuzhen Du, Takashi Kyotani, Akira Tomita
The usefulness of surface envelope substances (Al(OH)3, AlPO4, Al2(SiO3)3, Zn3(PO4)2, and ZnSiO3) and additives (Na2EDTA, MgSO4) on the stability of lanthanum bromide oxide phosphor against the action of water have been studied. The envelope substance forms a protective film on the surface of phosphor particles. The surface-treated phosphor particles were observed by scanning electron microscopy, and an X-ray photoelectron spectrometer was used to characterize the surface. The presence of surface envelope and/or additive improved the moisture resistance properties of the phosphor by decreasing the concentration of La(OH)2+ ion which acts as a catalyst in the hydrolysis of LaOBr.
{"title":"Effect of surface treatment on stability of lanthanum oxide bromide phosphor","authors":"Jutang Sun, Xiuzhen Du, Takashi Kyotani, Akira Tomita","doi":"10.1016/0168-7336(89)80054-3","DOIUrl":"10.1016/0168-7336(89)80054-3","url":null,"abstract":"<div><p>The usefulness of surface envelope substances (Al(OH)<sub>3</sub>, AlPO<sub>4</sub>, Al<sub>2</sub>(SiO<sub>3</sub>)<sub>3</sub>, Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, and ZnSiO<sub>3</sub>) and additives (Na<sub>2</sub>EDTA, MgSO<sub>4</sub>) on the stability of lanthanum bromide oxide phosphor against the action of water have been studied. The envelope substance forms a protective film on the surface of phosphor particles. The surface-treated phosphor particles were observed by scanning electron microscopy, and an X-ray photoelectron spectrometer was used to characterize the surface. The presence of surface envelope and/or additive improved the moisture resistance properties of the phosphor by decreasing the concentration of La(OH)<sub>2</sub><sup>+</sup> ion which acts as a catalyst in the hydrolysis of LaOBr.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 331-342"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80054-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73744083","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80062-2
{"title":"Highlights from Japan","authors":"","doi":"10.1016/0168-7336(89)80062-2","DOIUrl":"https://doi.org/10.1016/0168-7336(89)80062-2","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 414-415"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80062-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136403135","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80056-7
K. Petrov, N. Zotov, O. García-Martínez, P. Millán, R.M. Rojas
The thermal decomposition of copper(II)-cobalt(II) hydroxide nitrate solid solutions, CuxCo2−x(OH)3NO3 (0 < x ⩽ 2.0) in air has been studied by thermal and X-ray diffraction techniques. It has been shown that the solid solutions formed are of a partially-ordered, substitutional type and that the reaction sequence during the thermal decomposition depends on the value of the stoichiometric coefficient x.
{"title":"Effect of the composition on the lattice parameters and thermal behaviour of copper(II)-cobalt(II) hydroxide nitrate solid solutions","authors":"K. Petrov, N. Zotov, O. García-Martínez, P. Millán, R.M. Rojas","doi":"10.1016/0168-7336(89)80056-7","DOIUrl":"10.1016/0168-7336(89)80056-7","url":null,"abstract":"<div><p>The thermal decomposition of copper(II)-cobalt(II) hydroxide nitrate solid solutions, Cu<sub><em>x</em></sub>Co<sub>2−<em>x</em></sub>(OH)<sub>3</sub>NO<sub>3</sub> (0 < <em>x</em> ⩽ 2.0) in air has been studied by thermal and X-ray diffraction techniques. It has been shown that the solid solutions formed are of a partially-ordered, substitutional type and that the reaction sequence during the thermal decomposition depends on the value of the stoichiometric coefficient <em>x</em>.</p></div>","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 359-369"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80056-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73437206","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80061-0
L. Burzynska, Z. Zembura ∗, J. Karp
{"title":"Formation of copper hydride during spontaneous dissolution of brass with hydrogen depolarization","authors":"L. Burzynska, Z. Zembura ∗, J. Karp","doi":"10.1016/0168-7336(89)80061-0","DOIUrl":"10.1016/0168-7336(89)80061-0","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 409-412"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80061-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78879377","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80066-X
V.V. Boldyrev
{"title":"Reports of the U.S.S.R. Academy of Sciences, 1 (1988) 162","authors":"V.V. Boldyrev","doi":"10.1016/0168-7336(89)80066-X","DOIUrl":"10.1016/0168-7336(89)80066-X","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Pages 420-421"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80066-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90440103","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}
Pub Date : 1989-11-01DOI: 10.1016/0168-7336(89)80064-6
K.P. Kumar
{"title":"Infiltration in ceramic processing: new life for old technology","authors":"K.P. Kumar","doi":"10.1016/0168-7336(89)80064-6","DOIUrl":"10.1016/0168-7336(89)80064-6","url":null,"abstract":"","PeriodicalId":101061,"journal":{"name":"Reactivity of Solids","volume":"7 4","pages":"Page 416"},"PeriodicalIF":0.0,"publicationDate":"1989-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-7336(89)80064-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83952632","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}
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