Crystal Growth, Magnetic Properties and Analysis of Possible Magnetic Ordering of Ni5Sn(BO5)2 with Ludwigite Structure

Софронова, С. Н.; Безматерных, Л. Н.; Еремин, Е. В.; Chernyshov, Artem; Bovina, A. F.

doi:10.1002/pssb.201800281

Cited by 5 publications

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References 15 publications

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“…It is necessary to note that Cu 2 CrBO 5 possesses structural cationic ordering. This is not typical for almost all heterometallic ludwigites due to the presence of four nonequivalent cation positions in the unit cell (Figure 1) [2][3][4][5]. The temperature of magnetic ordering in the copper-chromium ludwigite is quite high for the representatives of this family, with T N = 120 K [1].…”

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confidence: 95%

Flux Growth and Raman Spectroscopy Study of Cu2CrBO5 Crystals

Moshkina,

Eremin,

Molokeev

et al. 2023

Crystals

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Multicomponent flux systems based on both Li2WO4-B2O3-Li2O-CuO-Cr2O3 and Bi2O3-MoO3-B2O3-Na2O-CuO-Cr2O3 were studied in order to grow Cu2CrBO5 crystals. The conditions for Cu2CrBO5 crystallization were investigated by varyingthe component ratios, and the peculiarities of their interaction were characterized by studying the formation sequence of high-temperature crystallizing phases. Special attention was paid to the problem of Cr2O3 solubility. Phase boundaries between CuCrO2, Cu2CrO4, and Cu2CrBO5 were considered. The crystal structure of the obtained samples was studied viasingle crystal and powder X-ray diffraction. The chemical composition of the grown crystals was examined using the EDX technique. Anactual ratio of Cu:Cr = 1.89:1.11 was found for Cu2CrBO5 grown from the lithium-tungstate system, which showed a small deviation from 2:1, implying the presence of a part of bivalent Cr2+ in the samples. Anomalies in the thermal dependence of magnetization were analyzed and compared with the previously obtained data for Cu2CrBO5. The anomaly at TC ≈ 42 K and the antiferromagnetic phase transition at TN ≈ 119 K were considered. Polarized Raman spectra of Cu2CrBO5 were obtained for the first time, and a comparative analysis of the obtained data with other monoclinic and orthorhombic ludwigites is presented. Along with the polarized room temperature spectra, the thermal evolution of Raman modes near the antiferromagnetic phase transition temperature TN ≈ 119 K is provided. The influence of the magnetic phase transition on the Raman spectra of Cu2CrBO5 is discussed.

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