Sofronova S. N.1, Eremin E. V.1, Moshkina A. V.1, Selyanina A. V.1
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: ssn@iph.krasn.ru
The studied solid solutions Co3+Ni2+0.33Co2+1.67BO5 and Co3+Ni2+0.59Co2+1.41BO5 are ferrimagnets with magnetic transition temperatures of 46 and 48 K, respectively. Substitution of nickel ions for divalent cobalt ions in ludwigite Co3BO5 has virtually no effect on the magnetic properties: temperature, magnetic crystallization, and the same characteristics, temperature dependences, and field dependences of magnetization, corresponding to the cm-1 behavior of magnetization in Co3BO5, are identical. Trivalent cobalt ions likely remain in a low-spin state, and the nature of the exchange interactions of magnetic ions remains unchanged. Keywords: ludwigites, magnetic phase transition, indirect exchange interactions.
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