A MOSSBAUER STUDY ON SOLID KRYPTON PRECIPITATES IN ALUMINUM

Mossbauer spectroscopy on the 9.40 keV transition Kr-83 is used to obt ain information about solid Kr precipitates in Al. Three different (Rb I)-Rb-83 sources differing in water content were used, which, when mea sured against a solid Kr absorber, show a quadrupole component in addi tion to a dominating single line. An analytical deconvolution techniqu e is presented which takes care of the source characteristics. The spe ctra of Kr bubbles in Al obtained by high-dose implantation show two c omponents: a single line from Kr atoms inside the bubble and a quadrup ole split component from Kr at the Kr-Al interface. Spectra were taken as a function of temperature. The total absorption area could be fitt ed very well assuming a simple Debye model, yielding a Debye temperatu re of THETA(D)T = 101 (2) K. A decomposition of the total area in the areas of quadrupole and single-line components yields Debye temperatur es of THETA(D)Q = 98(6) K and THETA(D)S = 90(10) K respectively.