This volume of the journal contains papers presented at the 21st international conference on solid compounds of transition elements, scte 2018 which was held in the technische universit鋞 wien, austria, from march 25 to march 29, 2018. The conference was dedicated to fundamental and applied research regarding structure, crystal chemistry, chemical bonding, as well as with magnetic, thermodynamic, phononic and electronic properties of different classes of intermetallic compounds. Hydrides, borides, carbides, silicides and homologues, pnictides, chalcogenides, oxides and halides (especially those of low oxidation states exhibiting metal or semimetal properties) were in the focus of the conference also.
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