Jacobs Jonas, Wang Hai-Chen, Marques Miguel A L, Ebbinghaus Stefan G
Faculty of Natural Sciences II, Institute of Chemistry, Inorganic Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 2, D-06120 Halle, Germany.
Research Center Future Energy Materials and Systems of the University Alliance Ruhr, Faculty of Mechanical Engineering, Ruhr University Bochum, Universitätsstraße 150, D-44801 Bochum, Germany.
Inorg Chem. 2024 Jun 17;63(24):11317-11324. doi: 10.1021/acs.inorgchem.4c01330. Epub 2024 Jun 3.
Ruddlesden-Popper oxyfluorides of the substitution series LaNiCuOF (0 ≤ ≤ 1) were obtained by topochemical fluorination with polyvinylidene fluoride (PVDF) of oxide precursors LaNiCuO. The thermal stability and the temperature-dependent unit cell evolution of the oxyfluorides were investigated by high-temperature XRD measurements. The oxyfluoride with = 0.6 shows the highest decomposition temperature of ∼ 520 °C, which is significantly higher than the ones found for the end members LaNiOF ( = 0) ∼ 460 °C and LaCuOF ( = 1) ∼ 430 °C. The magnetic properties of all LaNiCuOF oxyfluorides were characterized by field- and temperature-dependent measurements as well as DFT calculations of the magnetic ground state. An antiferromagnetic ordering was derived for all substitution levels. For the Néel temperature (), a nonlinear dependence on the copper content was found, and comparably high values of in the region of 200-250 K were observed in the broad composition range of 0.3 ≤ ≤ 0.8.
通过用聚偏二氟乙烯（PVDF）对氧化物前驱体LaNiCuO进行拓扑化学氟化，获得了取代系列LaNiCuOF（0≤≤1）的Ruddlesden-Popper氧氟化物。通过高温XRD测量研究了氧氟化物的热稳定性和随温度变化的晶胞演化。= 0.6的氧氟化物显示出最高的分解温度约为520°C，这明显高于端成员LaNiOF（= 0）约460°C和LaCuOF（= 1）约430°C的分解温度。所有LaNiCuOF氧氟化物的磁性通过场和温度相关测量以及磁基态的DFT计算进行表征。得出所有取代水平均存在反铁磁有序。对于奈尔温度（），发现其与铜含量呈非线性关系，并且在0.3≤≤0.8的宽组成范围内，在200 - 250 K区域观察到了相当高的 值。
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