Stored Energy, Volume, and Resistivity Change in Neutron Irradiated Aluminium

Pure aluminium samples are irradiated at 4 °K in the core of the Munich Research Reactor. Measurements are then made of the release of the stored energy (ΔQ and the changes in the length (Δl) and electrical resistivity (Δ∂) during annealing between 4 and 300 °K. For the first annealing stage, observed between 4 and 55 °K, these measurements yield . The corresponding ratios for the two other observed stages have similar values. The experimental results suggest the following values for specific properties of defects in aluminium (EF, Ei, Ev being the energies of a Frenkel defect, an interstitial, and a vacancy, respectively; VF is the volume change per Frenkel defect; ∂F, ∂i, ∂v are the resistivity changes per unit concentration of Frenkel defects, interstitials, and vacancies, respectively): EF = 3.4 eV; Ev = 0.8 eV; Ei = 2.6 eV; VF = 1.2 atomvol.; ∂F = 340 μΩcm; ∂v = 220 μΩcm; ∂i = 120 μΩcm. Nach Bestrahlung von reinen Aluminiumproben bei 4 °K im Kern des Forschungsreaktors Munchen wurden die Freigabe gespeicherter Energie ΔQ, die Langenanderung Δl und die Restwiderstandsanderung Δ∂ im Verlauf von Temperbehandlungen zwischen 4 und 300 °K gemessen. Fur die erste, zwischen 4 und 55 °K liegende Erholungsstufe gilt . Die entsprechenden Verhaltnisse fur die beiden anderen Erholungsstufen stimmen damit nahezu uberein. Nach den Mesergebnissen sind folgende Zahlenwerte fur die Energie pro Frenkeldefekt EF, pro Leerstelle Ev, pro Zwischengitteratom Ei, fur das Volumen eines Frenkeldefekts VF und fur den spezifischen Widerstand pro Einheitskonzentration an Fehlstellen in Aluminium plausibel: EF = 3,4 eV; Ev = 0,8 eV; Ei = 2,6 eV; VF = 1,2 Atomvolumen; ∂F = 340 μΩcm; ∂v = 220 μΩcm; ∂i = 120 μΩcm.

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