Materials Science and Engineering最新文献_第10页

Optical reflectivity of glassy PdUSi alloys 玻态PdUSi合金的光学反射率

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90347-3

R. Lapka, G. Leemann, H.-J. Güntherodt

引用次数: 2

Photoemission studies on metallic glasses using synchrotron radiation 用同步辐射研究金属玻璃的光发射

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90336-9

D. Greig, B.L. Gallagher, M.A. Howson, D.S.-L. Law, D. Norman, F.M. Quinn

{"title":"Photoemission studies on metallic glasses using synchrotron radiation","authors":"D. Greig, B.L. Gallagher, M.A. Howson, D.S.-L. Law, D. Norman, F.M. Quinn","doi":"10.1016/0025-5416(88)90336-9","DOIUrl":"10.1016/0025-5416(88)90336-9","url":null,"abstract":"<div><p>We report on the use of UV synchrotron radiation in the energy range 40–120 eV to probe the electron states of CuZr, FeZr, CoZr and CuHf amorphous alloys. The great advantage of tunable radiation over fixed frequency sources is that it allows identification of the electron states from a knowledge of the energy dependences of their scattering cross-sections. This variation is particularly pronounced in the case of the d states of zirconium which are essentially removed from the observed photoelectron spectra as the photon energy is increased from 40 eV to about 100 eV. The results confirm, for example, that for CuZr alloys it is the d states from zirconium that lie at the Fermi level.</p><p>By combining these results with those obtained from a technique involving constant initial states the scattering cross-sections for the Zr 4d and Cu 3d states were investigated. This will allow the experimental photoemission data to be corrected to give a more representative picture of the electronic band structure of these alloys, and has laid the foundation for extending the method to other newer alloy systems where the electron states have still not been identified.</p></div>","PeriodicalId":100890,"journal":{"name":"Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0025-5416(88)90336-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82698467","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

Atomic structure of quasicrystals 准晶体的原子结构

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90350-3

T. Egami, S.J. Poon

引用次数: 5

Preferential crystallite orientation in melt spun NdFeB permanent magnet materials 熔体纺NdFeB永磁材料的优先取向

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90308-4

R. Coehoorn, J. Duchateau

引用次数: 58

Electronic structure of quasi-crystalline AlMn in comparison with amorphous and crystalline alloys 准晶AlMn与非晶和结晶合金的电子结构比较

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90358-8

J.M. Frigerio, A. Meddour, A. Perez, M.G. Blanchin, J.P. Dupin, J. Rivory

引用次数: 6

Local icosahedral packing energetics for d-band metals d波段金属的局部二十面体填充能量学

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90355-2

Robert B. Phillips, A.E. Carlsson

{"title":"Local icosahedral packing energetics for d-band metals","authors":"Robert B. Phillips, A.E. Carlsson","doi":"10.1016/0025-5416(88)90355-2","DOIUrl":"10.1016/0025-5416(88)90355-2","url":null,"abstract":"<div><p>Local icosahedral order in solid environments is modelled by polytope {3, 3, 5} (a packing of atoms on S<sup>3</sup>, the surface of the unit sphere in four dimensions, with perfect icosahedral symmetry) and by a 147 atom extension of the Mackay icosahedron. The bonding energies of each are calculated in a one-electron d-band, tight binding model, as a function of d-band filling. The energies per site on the polytope, and on the central atom of the extended Mackay icosahedron, are then compared with those in the f.c.c. structure to reveal chemical trends in the relative stability of local icosahedral packing. The calculated structural energy differences show that even in fairly close-packed metals, local icosahedral packing is preferred only over a limited range of d-band fillings, roughly between 2 and 5 d-electrons per atom, even when frustration effects are artificially turned off by the use of the polytope. It is also observed that the magnitude of these energy differences is of the same order of magnitude as the structural energy differences between f.c.c. and b.c.c. structures and typically exceed the elastic energy differences which arise as a result of atomic size mismatches. These phase stability results are in marked contrast with those calculated in pair potential models.</p></div>","PeriodicalId":100890,"journal":{"name":"Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0025-5416(88)90355-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76127014","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: 1

Electronic structure of (Ni33Zr67)1 − 1Xx (X ≡ Ti, V, Cr, Mn, Fe, Co, Ni or Cu) ternary metallic glasses studied by low temperature specific heat measurements 低温比热测量研究了(Ni33Zr67)1−1Xx (X≡Ti, V, Cr, Mn, Fe, Co, Ni或Cu)三元金属玻璃的电子结构

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90342-4

Y. Yamada, Y. Itoh, U. Mizutani

引用次数: 24

Professeur Jacques Durand 雅克·杜兰德教授

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90278-9

W.L. Johnson

引用次数: 0

Fast dissipative and diffusional relaxation of the magnetic permeability in ferromagnetic metallic glasses 铁磁金属玻璃磁导率的快速耗散和扩散弛豫

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90284-4

P. Allia , C. Beatrice , F. Vinai

引用次数: 2

Production and properties of melt-spun Fe-6.5wt.%Si ribbons 熔融纺铁-6.5wt的生产及性能。%如果丝带

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90295-9

Y. Sato, T. Sato, Y. Okazaki

引用次数: 27