Colloidal size-selected copper-doped Ag–In–S quantum dots were produced directly in aqueous solutions by fractionation/redispersion with a plethora of emission colors and a top luminescence quantum yield of around 60%.

Phase relations in two binary systems MgAl 2 O 4 -ZnAl 2 O 4 and MgAl 2 O 4 -Mg 2 TiO 4 have been studied and phase diagrams for them have been constructed. Based on the data of x-ray phase and crystal-optical analyses, the formation of a continuous series of solid solutions with spinel structure between the terminal members of the systems studied has been established. In the MgAl 2 O 4 -ZnAl 2 O 4 system the solid solution is stable in the range from room temperature to melting temperature. In the MgAl 2 O 4 -Mg 2 TiO 4 system the solid solution decomposes below 1380 ± C, yielding the formation of limited regions of homogeneity on the basis of MgAl 2 O 4 and Mg 212d Ti 12d O 4 . Decomposition of the solid solution is accompanied by crystallization of MgTiO 3 .

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