We report on the synthesis of Mg_0.6Mn_0.7Co_0.7Ni_0.6Cu_0.4TeO₆, which is isostructural with multiferroic Mn₃TeO₆ (space group 𝑅3¯$R\overline{\mathrm{3}}$$R\overline{\mathrm{3}}$). Study of its magnetic properties indicates establishment of the long-range antiferromagnetic order at 16.3 K, slightly lower than that of pure Mn₃TeO₆. The tiny hysteresis of magnetization loop along with specific heat data implies the presence of ferromagnetic magnons at low temperatures. Dielectric measurements reveal sequence of well-defined steps in the real part of permittivity and peaks in the imaginary parts of permittivity at 30, 92, and 212 K attributable to the highly diffused structural changes, which are characteristic to relaxor ferroelectrics. It is shown that usual interpretation of this structure type as corundum-related is not accurate: the hexagonal oxygen packing is not close and is not double-layered. Therefore, Mn₃TeO₆ represents a very special structure type.

中文翻译：

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高熵磁体（Mg、Mn、Co、Ni、Cu）3TeO6的制备和表征


我们报道了 Mg_0.6Mn_0.7Co_0.7Ni_0.6Cu_0.4TeO₆ 的合成，它与多铁性 Mn₃TeO₆（空间群𝑅3¯$R\overline{\mathrm{3}}$$R\overline{\mathrm{3}}$
).对其磁特性的研究表明，在 16.3 K 处建立了长程反铁磁序，略低于纯 Mn₃TeO₆。磁化回线的微小磁滞以及比热数据意味着在低温下存在铁磁磁振子。介电测量揭示了介电常数实部中明确定义的阶跃序列，以及 30、92 和 212 K 时介电常数虚部的峰值，这归因于高度扩散的结构变化，这是弛豫铁电体的特征。结果表明，通常将这种结构类型解释为与刚玉相关的解释并不准确：六方氧填料不紧密，也不是双层的。因此，Mn₃TeO₆ 代表了一种非常特殊的结构类型。