J. Phys. IV France 03 (1993) C4-201-C4-203
Positron annihilation studies in binary solid solutions of metal betadiketonates, using lifetime and Doppler broadening spectroscopiesJ.C. MACHADO, A.O. PORTO, C.F. CARVALHO, W.F. MAGALHAES and A. MARQUES-NETTO
Departamento de Química, ICEx, UFMG, C.P. 702, 31270 901 Belo Horizonte M.G., Brazil
Positron annihilation lifetime (LS) and Doppler broadening annihilation radiation lineshape (DBARL) spectroscopies measurements were performed in several binary solid solutions of the general formula M(1-x)G(x)L3 where M = Al (III), Ga (III), or In (III), as matrix ; G = Cr (III), Mn (III), Fe (III), Co (III), Ru (III), Rh (III), and Ir (III), as guest molecules, L = acetylacetone (acac) or dipivaloylmethane (dpm), and X = guest molecule mole fraction. The studied systems can be classified in two groups : the first one presenting only inhibition of positronium formation and the second one presenting inhibition and quenching effects. The inhibition and quenching constants were determined.
© EDP Sciences 1993