| Autor: |
Claude Sella, M. Kaabouchi, Françoise Bridou, Gloria Foulet, Ramanthan Krishnan, Frantz Wehling, Hacene Lasri, B. Pardo, Jean Pierre Ambroise, M. Miloche, M. Groos, M. Maaza |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Neutron Optical Devices and Applications. |
| ISSN: |
0277-786X |
| DOI: |
10.1117/12.130618 |
| Popis: |
Diffusion in Ni-Ti multilayers with a period of 120 angstroms is studied in the temperature range of 293 - 743 K by using the grazing angle unpolarized neutron reflectometry. It was shown that Ni diffuses into Ti in this temperature range. The effective diffusion coefficient Deff of Ni into Ti and its corresponding activation energy Qa are determined by measuring the decay of the reflectivity of first Bragg peak arising from the nuclear scattering length density modulation, as a function of annealing temperature at constant time. Two diffusion regimes separated by a pseudo-transition temperature Tc approximately equals 543 K are observed in this Ni-Ti multilayer. The corresponding activation energy values are 0.21 eV and 0.43 eV respectively. The unpolarized neutron reflectivity measurements are completed by crystalline structure, chemical profiling, and magnetic studies.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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