Drokina T. V.1, Vorotynov A. M.1, Balaev A. D.1, Bayukov O. A.1, Molokeev M. S.1
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: tvd@iph.krasn.ru, sasa@iph.krasn.ru, adbalaev@iph.krasn.ru, helg@iph.krasn.ru, msmolokeev@mail.ru
The structural, resonance, and static magnetic properties of the Na2FeLiSi6O15 compound obtained by solid-phase synthesis from the initial oxides Li2CO3, Na2CO3, Fe2O3, SiO2 were studied. It is shown that iron cations in emeleusite, which are in the high-spin state Fe3+ (S=5/2, 3d5) and in ideal octahedra constituted by oxygen anions, in the temperature range of 4.2-300 K form a paramagnetic subsystem with a molar value of the effective magnetic moment μeff=6.02 μ B and with a g-factor at T=297.8 K equal to 2.092. Apparently, due to the separation of iron cations by groups of non-magnetic ions SiO4, LiO4, the exchange interaction between them is small (the shortest distances Fe-Fe are equal to 5.867(3) Angstrem), which leads to the absence of long-range magnetic order. Keywords: synthesis, crystal structure, magnetic and resonant properties.
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