doi:10.1016/j.jmmm.2021.168056engKazak, NVBelskaya, NAMoshkina, EMBezmaternykh, LNVasiliev, ADBartolome, JArauzo, AVelikanov, DAGavrilkin, SYGorev, MVPatrin, GSOvchinnikov, SGCo5/3Nb1/3BO4: A new cobalt oxyborate with a complex magnetic structureART-2021-126370Needle-shape single crystals of Co5/3Nb1/3BO4 warwickite were grown using the flux technique. X-ray diffraction measurements have revealed an orthorhombic structure (Sp. Gr. Pbnm) where the octahedral M1 site is occupied by a mixture of Co2+/Nb5+ ions and the M2 site is exclusively filled by Co2+ ions. Using dc magnetization measurements it was established that the new material undergoes two magnetic transitions: an antiferromagnetic transition at TN1 = 27 K and a ferrimagnetic one at TN2 = 14 K, below which a hysteresis cycle opens. Both magnetic transitions are marked by anomalies in the specific heat. High magnetic anisotropy with c-axis as a hard magnetization direction was detected.2021http://zaguan.unizar.es/record/12946110.1016/j.jmmm.2021.168056http://zaguan.unizar.es/record/129461oai:zaguan.unizar.es:129461Journal of Magnetism and Magnetic Materials 534 (2021), 168056by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess