Trigonal layered rosiaite-related antiferromagnet MnSnTeO6: ion-exchange preparation, structure and magnetic properties

Authors:
  • VNV. B. Nalbandyan
    V. B. Nalbandyan
  • MEM. A. Evstigneeva
    M. A. Evstigneeva
  • TVT. M. Vasilchikova
    T. M. Vasilchikova
  • KBK. Yu. Bukhteev
    K. Yu. Bukhteev
  • AVA. N. Vasiliev
    A. N. Vasiliev
  • EZE. A. Zvereva
    E. A. Zvereva
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Abstract
Ion-exchange treatment of Na2SnTeO6 in molten salt mixtures resulted in rosiaite (PbSb2O6)-related MnSnTeO6. Its crystal structure was refined by the Rietveld method. Of the three possible models of Sn/Te distribution, the disordered model ((P3 Im, a = 5.23093(11) A, c = 4.62430(16) A was preferred based on bond distances. However, it is supposed that each individual (SnTeO6)2- layer retains complete ordering of the precursor and the apparent disorder is only due to stacking faults. The magnetic studies have shown that MnSnTeO6 orders antiferromagnetically at Neel temperature TN = 9.8 K. The effective magnetic moment reasonably agrees with theoretical estimations assuming high-spin configuration of Mn2+ (S = 5/2). Electron spin resonance reveals spin dynamics in accordance with aniferromagnetic ordering with critical broadening of ESR linewidth indicating the low-dimentional type of exchange interactions. Based on the temperature and field-dependent magnetization studies, the magnetic phase diagram of the new compound was constructed.