摘要:

Rubidium ions, with energy in the range 0.1 MeV, 2.0 MeV have been implanted in TiO2single crystals at RT and LNT.

ISSN:0033-7579    

DOI:10.1080/00337578208223013

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

MgO implanted at room temperature with 150keV In+ions and doses ranging from 1015to 1017ions cm−2was studied by optical absorption and transmission electron microscopy (TEM). Creation of defects in the anionic sublattice (F-, F+-, F2-centers) and in the cationic sublattice (V−-centers) are observed. Subsequent annealings of the implanted crystals have shown different behaviours depending on the implanted dose. For medium dose (2 × 1016ions cm−2), the formation of In3+species seems to be the preponderant phenomenon. At higher dose (8 × 1016ions cm−2), metallic precipitates are formed between 400 and 700°C. The identification of these precipitates has been achieved using TEM: they are formed of a metallic alloy Mg3In with a hexagonal structure and their orientation relationship with respect to the MgO matrix is: (0001)Mg3In//(111)Mgo and [1120]Mg3In// [l10]MgO.

ISSN:0033-7579    

DOI:10.1080/00337578208223014

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Although the average composition change resulting from O or N implantation in a metal is small up to a dose of about 3 × 1016ions/cm2, the implanted atoms tend to be atomically mobile under the conditions used for bombardments and precipitation of an oxide or nitride can be expected. The object of this work is to explain what phases are formed. One model is based on the postulate that the precipitates are at the surface and have a high anion-to-cation ratio. The resultant phase therefore tends to be that which arises from the impact of any heavy particle on the surface of a high oxide or nitride. An alternative model is based on the postulate that the precipitates tend, independently of where they form, to be in qualified thermodynamic equilibrium with the metal. A consideration of the known examples of O or N implantation suggests that qualified thermodynamic equilibrium is the better guide to which phases are formed.

ISSN:0033-7579    

DOI:10.1080/00337578208223015

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Calcia stabilized zirconia thin films and yttria stabilized zirconia single crystals were Yb implanted at 150 and 210 keV, and at various doses up to 1.3 × 1017ions/cm2in order to modify locally the oxygen transport properties. Rutherford back-scattering and nuclear microanalysis on the implanted thin films give information about the implantation profiles and sputtering yields. The results show that the ratio of the sputtering rates of two elements of the film is equal to their concentration ratio. At high implantation doses the Yb profile is nearly flat in the surface region with [Yb]/[Zr] = 1.1.18O tracing experiments demonstrate that a significant oxidation of the implanted samples occurs in air at room temperature. Further oxidation takes place during a 500 °C annealing in air which does not modify the Yb profile and leads to a final mean composition

ISSN:0033-7579    

DOI:10.1080/00337578208223016

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Recent observation of the acoustic saturation and of phonon echoes in crystalline quartz after light irradiation with fast neutrons indicates that there are the same low-energy atomic tunnelling systems as in Si02glass.

ISSN:0033-7579    

DOI:10.1080/00337578208223017

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Ion implantation in LiNbO3and LiTaO3produces radiation damage by nuclear collisions. The amorphisation of the lattice reduces the refractive index of the material. In the case of fast ion bombardment with helium this damage layer is buried below the surface. The refractive index profile which then exists is suitable for an optical waveguide on the surface which supports several modes. Analysis of the refractive index profile yields the damage distribution in the crystal and this in turn can be compared with theoretical estimates of the damage production and ion ranges.

ISSN:0033-7579    

DOI:10.1080/00337578208223018

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor