The powder specimen of CuFeO₂ delafossite was synthesized by a hydrothermal method at 453 K. X-ray diffraction studies confirmed that the obtained pure delafossite phase was a mixture of the 3R and 2H polytypes, predominantly the former. Mössbauer spectral analysis revealed the paramagnetic state of the copper ferrite at room temperature. Below 12 K the spectra had complicated shapes of Zeeman sextets. Changes in the character of the hyperfine interactions did not correspond to the data reported for the single-crystal CuFeO₂. Magnetization measurements revealed that magnetic transition occurred at Néel temperature (T_N) = 12.5 K.

中文翻译：

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水热合成的铜铁矿 (CuFeO2) 的晶体结构和超精细相互作用

CuFeO ₂铜铁矿粉末样品是在 453 K 下通过水热法合成的。X 射线衍射研究证实，获得的纯铜铁矿相是 3 R和 2 H多型的混合物，主要是前者。穆斯堡尔光谱分析揭示了铜铁氧体在室温下的顺磁性状态。低于 12 K，光谱具有复杂的塞曼六重奏形状。超精细相互作用特征的变化与针对单晶 CuFeO ₂报告的数据不符。磁化测量显示磁转变发生在 Néel 温度 ( T _N ) = 12.5 K。