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

TL;DR

This study reports the synthesis, crystal structure, and magnetic properties of a new rosiaite-related MnSnTeO6 antiferromagnet, revealing its antiferromagnetic ordering at 9.8 K and low-dimensional exchange interactions.

Contribution

It introduces a novel ion-exchange synthesis method for MnSnTeO6, refines its crystal structure, and characterizes its magnetic behavior, including the magnetic phase diagram.

Findings

MnSnTeO6 orders antiferromagnetically at 9.8 K.

The magnetic moment aligns with high-spin Mn2+ expectations.

ESR indicates low-dimensional exchange interactions.

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.