You are here

Solid solutions based on intermetallic compounds as a tool to optimize the properties: development of new electrode and magnetic materials

Work number - M 36 FILED

Presented Ivan Franko National University of Lviv

Kordan V.M., Ph.D., Horiacha M.M., Ph.D

The search for new and the improvement of existing materials for the energy industry occupy an important place in fundamental and applied research. This work is dedicated to studies of solid solutions that can serve as a basis for novel functional materials. The influence of doping agents on the electrochemical and magnetic properties of the materials has been investigated comprehensively.

         The authors optimized the synthesis conditions for multicomponent solid solutions based on phases with stoichiometry 2:17, 1:5, 1:3, 1:2, 1:1, 1:1:1, 1:1:2, etc., containing s- (Li, Mg), p- (Al, In, Ga, Sn, Sb), d- (Ti, Ni, Cu, Y, Zr, La) and f- (Gd, Tb) elements. The crystal structures of over 25 new ternary and quaternary compounds were determined for the first time, including La3.65Mg30Sn1.10 and GdNi2Ga3In with new structure types. Based on complex electrochemical studies, a two-stage mechanism of lithium and magnesium intercalation into a matrix of a phase with Mn5Si3-type structure was proposed. The positive impact of doping the binary intermetallic compound Tb2Ni17 with Li and Mg on the corrosion resistance and hydrogen sorption capacity of the electrodes was determined.

         Crystal chemical analysis was performed; data on peculiarities of the structure types were systematized; the stability ranges of the solid solutions and the influence of the doping agents on the size of the homogeneity regions were determined, providing a basis for predicting and tuning properties. The systematized and summarized results contribute to the controlled synthesis of new materials with desired properties. Optimal compositions of solid solutions for the development of electrode and magnetic materials are recommended.

Number of publications: 34 articles (11 in international journals included in Scopus and/or Web of Science databases), 31 conference abstracts. The total number of references to the authors’ publications / h-index of the work, according to the databases: Web of Science – 27/4, Scopus – 30/4, Google Scholar – 122/7.