Dr. Stanislav I. Sadovnikov is currently a senior research scientist in the Laboratory of nonstoichiometric compounds of the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences. He has studied the synthesis, structure and properties of nanostructured semiconducting sulfides for more than 10 years and is a recognized expert in the field of nanosized sulfide synthesis. He is an author of two review articles and more than 60 scientific articles. Prof. Dr. Aleksandr I. Gusev is chief research scientist of the Laboratory of nonstoichiometric compounds in the Institute of Solid State Chemistry of the Russian Academy of Sciences. He has been exploring crystal and electronic structure and properties of novel nonstoichiometric compounds including carbides, sulfides, and oxides, and nanostructured advanced materials for more than 40 years. He is the author of 16 monographs including “Disorder and Order in Strongly Nonstoichiometric Compounds”, Springer (2001), “Nanocrystalline Materials”, Cambridge (2004), “Tungsten Carbides: Structure, Properties and Application in Hardmetals”, Springer (2013), 23 reviews articles and more than 250 scientific articles. Prof. Dr. Andrey A. Rempel is a head of the Laboratory of nonstoichiometric compounds of the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences. His current research interests are solid state physics, theory of phase transformations, atomic ordering in strongly nonstoichiometric compounds, nonstoichiometry and atomic defects in nanocrystalline substances including carbides, oxides, and sulfides. He is author of 10 monographs in English and Russian, 11 review articles and more than 200 scientific publications.