Large black single crystals with a metallic luster of Li16Sr6Ge6N and several other representatives the series Li16Ae6Tt6N Li16Ae6Tt6.5 (Ae=Ca, Sr; Tt=Si, Ge, Sn, Pb) were grown from mixtures respective elements addition binary alkaline-earth metal nitrides or lithium nitride in case nitrides. For synthesis modified high-temperature centrifugation-aided filtration (HTCAF) technique using reacti...