Magnetic frustration in lyonsite-type vanadates in FeVO4–Co3V2O8 system Niko Guskos, Grzegorz Zolnierkiewicz, Malwina Pilarska, Janusz Typek, Anna Blonska-Tabero and Konstantinos Aidinis Eur. Phys. J. Appl. Phys., 84 2 (2018) 20601 Published online: 19 December 2018 DOI: 10.1051/epjap/2018180220