摘要:

Polished (100) Cu crystals have been bombarded at target temperatures of 204 K, 294 K and 456 K by 10 and 20 keV Ne+ions up to a total dose of 1.7 × 1019ions/cm2. The plane of incidence was chosen to be a {100} plane perpendicular to the surface. Measurements have been performed for incident angles between 36° and 44° with respect to the surface normal. In this angular interval the sputtering ratio and the surface structure have been studied by weightloss and replica electron microscope techniques respectively. At target temperatures of 204 K and 294 K an anomaly was observed in the curve of the sputtering ratio versus angle of incidence. A small peak appears where the curve slopes towards the ⟨110⟩ minimum. The position and height of the peak is a function of target temperature and ion energy.

ISSN:0033-7579    

DOI:10.1080/00337577108231002

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Nous avons mesuré simultanément les variations de longueur et de résistivité de tungstène soumis à une traction uniaxiale σ et irradié par des fragments de fission à 20 K.

ISSN:0033-7579    

DOI:10.1080/00337577108231003

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Scanning electron microscopy has been used to examine bulk phenomena of palladium samples annealed at 1200°C after implantation to a dose of 1017He atoms/cm2at 5 MeV. A 3μ deep porous layer was found at a depth of 10.9μ±0.3μ. Wide grain boundaries (microcracks) extended from this layer to the top surface of the sample.

ISSN:0033-7579    

DOI:10.1080/00337577108231004

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The energy loss of keV protons, in thin films of C, Al and Ag is determined by a method in which the strong energy dependence of the cross section for X-ray excitation by protons, in a material, on which the films are evaporated, is used as an indicator of the proton energy.

ISSN:0033-7579    

DOI:10.1080/00337577108231005

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Nickel 270 (99.98 per cent nominal purity) was irradiated in EBR-II to fluences ranging from 1 × 1018to 1.5 × 1022neutrons/cm2at temperatures between 375 and 525°C. Voids were observed in all specimens in concentrations of 1 to 3 × 1014/cm3, independent of temperature and fluence. At low fluences the voids were non-homogeneously distributed. These observations are interpreted in terms of void nucleation on sites existing in the material prior to irradiation. The results are compared with other observations on nickel of comparable and higher purity. Large differences exist not only in the magnitude of void concentrations but also in temperature and fluence dependencies. These differences indicate that a single, void nucleation mechanism is not operative and that impurities play an important role in determining the nature and amount of damage produced by neutron irradiation at elevated temperatures.

ISSN:0033-7579    

DOI:10.1080/00337577108231006

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The effect of differing conditions on the extent and nature of the damage produced in organic substances by γ-irradiation at low dose rates has been examined by a new chromatographic method which makes detection possible in a region where all other standard techniques fail. Use is made of the fact that certain surface active dyes profoundly affect the shape of a chromatographic band in a manner related to the composition of the material undergoing chromatography.

ISSN:0033-7579    

DOI:10.1080/00337577108231007

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The paramagnetism of neutron irradiated α-quartz single crystals is given versus the relative density decrease of the specimens. There clearly exists a relation between the radiation induced susceptibility and density change. The precise correlation, however, depends on experimental conditions, amongst which the irradiation temperature may be.

ISSN:0033-7579    

DOI:10.1080/00337577108231008

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The critical angles and critical approach distances, which determine the limits for the channelling of energetic ions, down open crystal directions are established by the methods of computer simulation and compared with simple analytical models. For non-vibrating rows or planes a good agreement between the two is obtained. The complicating effects of thermal vibrations can be accounted for by empirical formulae.

ISSN:0033-7579    

DOI:10.1080/00337577108231009

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Simplified models are presented, simulating the irradiation of lithium fluoride single crystals. In these models the evolution of the primary defect concentration versus the number of Frenkel pairs, induced at random in the lattice, is studied from a statistical point of view. The maximum defect concentration follows as a consequence of postulated annihilation volumes in which a newly created primary recombines with one of its antidefects. The fact whether single or di-atomic interstitials are considered has only a minor effect on the maximum defect retention.

ISSN:0033-7579    

DOI:10.1080/00337577108231010

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The angular dependences of the secondary ion-electron emission coefficient of copper crystal have been studied experimentally in wide angular and energy ranges.

ISSN:0033-7579    

DOI:10.1080/00337577108231011

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor