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Study of the temperature evolution of defect agglomerates in neutron irradiated molybdenum single crystals |
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| Authors: | O.A. Lambri G.I. Zelada-Lambri P.B. Bozzano |
| Affiliation: | a Instituto de Física Rosario. Member of the CONICET’s Research Staff, Avda. Pellegrini 250, (2000) Rosario, Santa Fe, Argentina b Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario, Laboratorio de Materiales, Escuela de Ingeniería Eléctrica, Avda. Pellegrini 250, (2000) Rosario, Santa Fe, Argentina c Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble, France d Laboratorio de Microscopía Electrónica. Unidad de Actividad Materiales, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Avda. Gral. Paz 1499, (1650) San Martín, Argentina e Departamento de Física Aplicada II, Facultad de Ciencias y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, País Vasco, Spain |
| Abstract: | Small angle neutron scattering as a function of temperature, differential thermal analysis, electrical resistivity and transmission electron microscopy studies have been performed in low rate neutron irradiated single crystalline molybdenum, at room temperature, for checking the evolution of the defects agglomerates in the temperature interval between room temperature and 1200 K. The onset of vacancies mobility was found to happen in temperatures within the stage III of recovery. At around 550 K, the agglomerates of vacancies achieve the largest size, as determined from the Guinier approximation for spherical particles. In addition, the decrease of the vacancy concentration together with the dissolution of the agglomerates at temperatures higher than around 920 K was observed, which produce the release of internal stresses in the structure. |
| Keywords: | 61.50.&minus f 61.72&minus y 61.12&minus q 61.16&minus d 72.15.Eb |
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