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Journal of The Less Common Metals最新文献

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Ion beam deposition of silver on YBCO powder and the superconductivity of Ag-YBCO composites 银在YBCO粉末上的离子束沉积及Ag-YBCO复合材料的超导性
Journal of The Less Common Metals Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90363-9
H. R. Khan, H. Frey
{"title":"Ion beam deposition of silver on YBCO powder and the superconductivity of Ag-YBCO composites","authors":"H. R. Khan, H. Frey","doi":"10.1016/0022-5088(91)90363-9","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90363-9","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"1 1","pages":"177-182"},"PeriodicalIF":0.0,"publicationDate":"1991-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89463094","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
Influence of the microstructure on hydrogen diffusion in FeZr alloys FeZr合金中微观组织对氢扩散的影响
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90189-B
C.U. Maier, H. Kronmüller
{"title":"Influence of the microstructure on hydrogen diffusion in FeZr alloys","authors":"C.U. Maier,&nbsp;H. Kronmüller","doi":"10.1016/0022-5088(91)90189-B","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90189-B","url":null,"abstract":"<div><p>The influence of the microstructure on the relaxation behaviour of hydrogen in partially crystallized nano- and microcrystalline Fe<sub>90</sub>Zr<sub>10</sub> as well as in single-phase Fe<sub>2</sub>Zr was investigated in the temperature range between 4.2 and 500 K by means of magnetic after-effect measurements. Reorientation processes of hydrogen in amorphous, grain boundary and crystalline phases led to characteristic relaxation maxima and activation enthalpies which were assigned to hydrogen jumps between anisotropic interstitial sites within the different structures. In addition, the degassing kinetics above 300 K were studied and allow a more detailed correlation between relaxation processes and microstructures.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 671-677"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90189-B","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71753872","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: 9
Hydrogenated FeTi superlattices studied by hydrogen depth profiling, Mössbauer spectroscopy and X-ray diffraction 氢化铁钛超晶格的氢深度剖面，Mössbauer光谱和x射线衍射研究
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90204-H
J. Rydén, B. Hjörvarsson, T. Ericsson, E. Karlsson, A. Chamberod, B. Rodmacq
{"title":"Hydrogenated FeTi superlattices studied by hydrogen depth profiling, Mössbauer spectroscopy and X-ray diffraction","authors":"J. Rydén,&nbsp;B. Hjörvarsson,&nbsp;T. Ericsson,&nbsp;E. Karlsson,&nbsp;A. Chamberod,&nbsp;B. Rodmacq","doi":"10.1016/0022-5088(91)90204-H","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90204-H","url":null,"abstract":"<div><p>Hydrogenated FeTi superlattices have been studied by hydrogen depth profiling, using the <sup>15</sup>N method, conversion electron Mössbauer spectroscopy and X-ray diffraction. The modulation wavelength of the sample was 40 nm and the ratio of the titanium to iron thicknesses was equal to three. It was found that mixing of the iron and titanium layers occurred during the annealing and hydrogenation procedure but that the superlattice structure was preserved. The latter result was explained by the negligible solubility of iron in titanium.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 784-791"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90204-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71753880","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
Hydrogen permeation characteristics of palladium-plated VNi alloy membranes 镀钯VNi合金膜的氢渗透特性
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90196-B
M. Amano, M. Komaki, C. Nishimura
{"title":"Hydrogen permeation characteristics of palladium-plated VNi alloy membranes","authors":"M. Amano,&nbsp;M. Komaki,&nbsp;C. Nishimura","doi":"10.1016/0022-5088(91)90196-B","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90196-B","url":null,"abstract":"<div><p>The hydrogen permeation characteristics of alloy membranes based on V-15 at.%Ni have been investigated in the temperature range 373–673 K. It has been found that palladium-coated V-15 at.%Ni alloy membranes exhibit good resistance to hydrogen embrittlement with a hydrogen permeability larger than that of a palladium membrane. The VNi alloy membrane did not exhibit any cracks even under an upstream hydrogen pressure of 0.2 MPa during the permeation test at 473 K. This revealed a conspicuous hydrogen trapping phenomenon below 473 K. The hydrogen permeability of the VNi alloy membrane increased as a result of adding 0.05 at.% of titanium, zirconium or yttrium, which was nearly equal to the amount of oxygen in the alloy; however, the hydrogen trapping phenomenon could not be eliminated by adding such deoxidizers. The trapping phenomenon could be markedly improved by removing the deformed layer of the alloy membrane before plating with palladium.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 727-731"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90196-B","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71753885","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: 71
Nuclear magnetic dipolar relaxation in disordered metal-hydrogen systems 无序金属-氢体系的核磁偶极弛豫
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90178-7
N. Adnani, J.M. Titman
{"title":"Nuclear magnetic dipolar relaxation in disordered metal-hydrogen systems","authors":"N. Adnani,&nbsp;J.M. Titman","doi":"10.1016/0022-5088(91)90178-7","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90178-7","url":null,"abstract":"<div><p>Computer simulations of the diffusion of hydrogen in structurally disordered alloys have been made. Calculations of the dipolar nuclear magnetic relaxation rate in the simulated alloys are reported.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 579-584"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90178-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71753896","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
Nuclear quadrupolar relaxation due to hydrogen diffusion in metal-hydrogen systems 金属-氢体系中氢扩散引起的核四极弛豫
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90177-6
S.W. Kelly, C.A. Sholl, E.F.W. Seymour
{"title":"Nuclear quadrupolar relaxation due to hydrogen diffusion in metal-hydrogen systems","authors":"S.W. Kelly,&nbsp;C.A. Sholl,&nbsp;E.F.W. Seymour","doi":"10.1016/0022-5088(91)90177-6","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90177-6","url":null,"abstract":"<div><p>Nuclear electric quadrupolar relaxation of deuterium or quadrupolar metal nuclei, due to diffusing hydrogen or deuterium, is estimated to dominate magnetic dipolar relaxation in metal-hydrogen systems. The longitudinal magnetization recoveries for quadrupolar relaxation can be linear combinations of several exponentials and expressions for the exponents depend on the spin <em>I</em>, whether a spin-temperature exists in the system and whether a static quadrupole interaction exists. Some limiting cases and examples are discussed.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 572-578"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90177-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71753897","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
Hydrogen diffusion in Nb1−y Vy alloys 氢在Nb1−y Vy合金中的扩散
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90184-6
A.F. McDowell, P.E. Mauger, R.M. Cotts
{"title":"Hydrogen diffusion in Nb1−y Vy alloys","authors":"A.F. McDowell,&nbsp;P.E. Mauger,&nbsp;R.M. Cotts","doi":"10.1016/0022-5088(91)90184-6","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90184-6","url":null,"abstract":"<div><p>Tracer diffusion coefficients <em>D</em><sub><em>t</em></sub> of hydrogen in niobium and some Nb<sub>1−<em>y</em></sub> V<sub><em>y</em></sub>H<sub><em>x</em></sub> alloys have been measured and are compared with chemical diffusion coefficients <em>D</em><sub><em>c</em></sub> from the literature. Nuclear magnetic resonance pulsed field gradient techniques were used to measure <em>D</em><sub><em>t</em></sub>. Comparison of the two diffusion coefficients is made taking into consideration the thermodynamic factor <span><math><mtext>(k</mtext><msub><mi></mi><mn>B</mn></msub><mtext>T)</mtext><msup><mi></mi><mn>−1</mn></msup><mtext>[</mtext><mtext>∂μ</mtext><mtext>∂(ln x</mtext><mtext>)]</mtext></math></span> which is obtained from pressure-composition isotherms for the alloys. The comparisons indicate satisfactory agreement between the two measures of the diffusion coefficient.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 624-630"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90184-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71753909","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: 2
Chemical bonding of hydrogen molecules to transition metal complexes 氢分子与过渡金属配合物的化学键合
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90168-4
Gregory J. Kubas
{"title":"Chemical bonding of hydrogen molecules to transition metal complexes","authors":"Gregory J. Kubas","doi":"10.1016/0022-5088(91)90168-4","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90168-4","url":null,"abstract":"<div><p>An overview of the recently discovered binding of molecular hydrogen (H<sub>2</sub>) to transition metal complexes is given. Emphasis is placed on the features which distinguish non-classical metal-dihydrogen bonding from classical atomic metal-hydride systems. Crystallographic and spectroscopic data (IR, nuclear magnetic resonance (NMR), inelastic neutron scattering) and theoretical aspects are discussed. The subtle factors which influence cleavage of bound H<sub>2</sub> to hydride are identified and examples are given demonstrating that a compound containing a dihydrogen “pair” can exist in facile equilibrium with the “isomeric” compound derived from it containing two separated hydrides. Metal-H<sub>2</sub> systems show a uniquely rich dynamic behavior, including rotation of the side-on bonded H<sub>2</sub>. The relatively low energy barrier to rotation is studied experimentally by inelastic neutron scattering and theoretically by <em>ab initio</em> methods, in relation to the bonding model for M-H<sub>2</sub>. Quantum mechanical tunneling and exchange processes are identified for bound dihydrogen and certain trihydride systems.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"172 ","pages":"Pages 475-484"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90168-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71754128","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: 8
Thermodynamic properties and cyclic hydriding-dehydriding stability of LaNi5 thin films LaNi5薄膜的热力学性质及循环加氢-脱氢稳定性
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90206-J
H. Uchida, T. Kojima, H. Hashimoto, A. Denda
{"title":"Thermodynamic properties and cyclic hydriding-dehydriding stability of LaNi5 thin films","authors":"H. Uchida, T. Kojima, H. Hashimoto, A. Denda","doi":"10.1016/0022-5088(91)90206-J","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90206-J","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"1 1","pages":"799-807"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72758689","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
Effect of surface contaminations on the hydriding behaviour of LaNi5 表面污染对LaNi5氢化行为的影响
Journal of The Less Common Metals Pub Date : 1991-08-30 DOI: 10.1016/0022-5088(91)90211-L
Y. Ohtani, S. Hashimoto, H. Uchida
{"title":"Effect of surface contaminations on the hydriding behaviour of LaNi5","authors":"Y. Ohtani, S. Hashimoto, H. Uchida","doi":"10.1016/0022-5088(91)90211-L","DOIUrl":"https://doi.org/10.1016/0022-5088(91)90211-L","url":null,"abstract":"","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"11 1","pages":"841-850"},"PeriodicalIF":0.0,"publicationDate":"1991-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77655233","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: 14
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