We report a synthesis method, and structural and magnetic characterization, for the fluoroperovskite ${\mathrm{NaFeF}}_3$. We have developed a wet-chemical method that allows preparation of large volumes of air-sensitive fluoroperovskites with high purity. ${\mathrm{NaFeF}}_3$ has a Néel temperature ($T_N$) of 90 K and a Weiss constant ($\theta$) of −124 K, corresponding to dominant antiferromagnetic interactions. Below $T_N$, a slight difference is observed between zero-field and field-cooled samples, indicating spin canting and weak ferromagnetism. AC magnetometry supports that weak ferromagnetism is inherent to ${\mathrm{NaFeF}}_3$ and not due to an impurity. From powder neutron diffraction data, we describe the magnetic structure precisely as a weakly canted G-type (magnetic space group $P{n}^{\prime }m{a}^{\prime }$). A ferromagnetic component is allowed in $P{n}^{\prime }m{a}^{\prime }$, however, this component is too small to be confirmed on the basis of powder neutron diffraction data and may be absent in zero magnetic fields.

中文翻译：

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新型湿化学合成方法制备的高纯度NaFeF3中反铁磁性

我们报告了氟钙钛矿的合成方法，结构和磁性表征 ${\mathrm{氟化铁}}_3$。我们已经开发出一种湿化学方法，可以制备大量高纯度的对空气敏感的氟钙钛矿。${\mathrm{氟化铁}}_3$ 内尔温度（${Ť}_{ñ}$）为90 K，Weiss常数为$\theta$）-124 K，对应于主要反铁磁相互作用。下面${Ť}_{ñ}$，在零磁场和磁场冷却的样品之间观察到细微的差异，表明自旋倾斜和弱铁磁性。交流磁力计支持弱铁磁性是固有的${\mathrm{氟化铁}}_3$而不是由于杂质。根据粉末中子衍射数据，我们将磁结构精确描述为弱倾斜G型（磁空间群$P{ñ}^{\prime }米{\mathrm{一种}}^{\prime }$）。铁磁成分允许进入$P{ñ}^{\prime }米{\mathrm{一种}}^{\prime }$但是，该成分太小，无法根据粉末中子衍射数据确定，并且可能在零磁场中不存在。