Positronium formation and inhibition in binary ionic solid solutions of general formula Al(1 − x)Cr(x)K(SO4)2 · 12 H2O: A positron annihilation lifetime and Doppler broadening spectroscopy study

Positron annihilation lifetime and Doppler broadening spectroscopies were applied in solid mixtures and solutions of AlK(SO4)2 · 12H2O and CrK(SO4)2 · 12H2O. For the solid solutions of the general formula Al(1 − x)Cr(x)K(SO4)2 · 12H2O (x = Cr(III)), a strong inhibition of positronium formation is observed with increasing chromium complex concentration. In the solid mixtures, the positronium formation decreases linearly with CrK(SO4)2 · 12H2O concentration, while the positronium lifetime remains constant for both solid binary mixtures and solutions. The experimental results are satisfactorily explained on basis of the spur model.