It was demonstrated that, in III-V and ternary compounds, the natural stimuli for ordered distribution of impurities along crystal nodes and interstitials, host atoms and inherent vacancies in right lattice positions prevailed over the others; which could lead to a heterogenic distribution. The result was obtained in the crystals, prepared in 1963-1977, due to each 10-15 years monitoring of their optical and mechanical properties. Here the results of the 2005-2008 monitoring were summarized, and compared with earlier data. It was shown that the partly inverse spinel CdIn2S4 turned into the perfect normal spinel, while in GaP the impurity ordering led to the formation of a new type of crystal lattices. Periodically disposed impurities and inherent structural defects modify, improve and stabilize properties of the crystals. New luminescent phenomena of these crystals, including stimulated emission and so-called hot luminescence were discovered.

Time-Dependent Evolution of Crystal Lattice, Defects and Impurities in CdIn2S4 and GaP. S.L.Pyshkin, J.Ballato, M.Bass, G.Chumanov, G.Turri: Physica Status Solidi C, 2009, 6[5], 1112-5