Vacancy recovery and vacancy-hydrogen interaction in niobium and tantalum studied by positrons
- 1 October 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 32 (7) , 4326-4331
- https://doi.org/10.1103/physrevb.32.4326
Abstract
Positron-lifetime measurements in electron-irradiated pure Nb and Ta show that monovacancy migration occurs at 220 and 260 K, respectively. Hydrogen impurities can be bound to vacancies, as is experimentally observed in Ta at 70 K after low-temperature α-particle irradiation. The vacancy-hydrogen complex formation shifts the vacancy migration to higher temperatures. Vacancy-hydrogen complexes retain the capability to trap positrons. Theoretical calculations performed for hydrogen and positron states at vacancies are in agreement with experimental findings.Keywords
This publication has 20 references indexed in Scilit:
- Stage III Recovery in tantalum as compared with stage III in niobiumHyperfine Interactions, 1983
- Vacancy recovery in irradiated niobiumJournal of Physics F: Metal Physics, 1983
- A latched constant fraction discriminator and its use in time resolution studiesNuclear Instruments and Methods in Physics Research, 1982
- Free migration of vacancies in niobium at 250 KPhysical Review B, 1982
- Vacancies and carbon impurities in- iron: Electron irradiationPhysical Review B, 1982
- High–temperature positron annihilation and vacancy formation in refractory metalsPhilosophical Magazine A, 1979
- The effect of microvoid size on positron annihilation characteristics and residual resistivity in metalsPhilosophical Magazine, 1977
- The resistivity recovery of niobium following low temperature electron irradiationRadiation Effects, 1977
- Vacancy migration in B.C.C. transition metalsScripta Metallurgica, 1974
- The intrinsic stage-III annealing in niobium and tantalum following electron irradiationScripta Metallurgica, 1974