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Flux Growth and Raman Spectroscopy Study of CuCrBO Crystals

Crystals, ISSN: 2073-4352, Vol: 13, Issue: 10
2023
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  • Citations
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Article Description

Multicomponent flux systems based on both LiWO-BO-LiO-CuO-CrO and BiO-MoO-BO-NaO-CuO-CrO were studied in order to grow CuCrBO crystals. The conditions for CuCrBO 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 CrO solubility. Phase boundaries between CuCrO, CuCrO, and CuCrBO 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 CuCrBO grown from the lithium-tungstate system, which showed a small deviation from 2:1, implying the presence of a part of bivalent Cr in the samples. Anomalies in the thermal dependence of magnetization were analyzed and compared with the previously obtained data for CuCrBO. The anomaly at T ≈ 42 K and the antiferromagnetic phase transition at T ≈ 119 K were considered. Polarized Raman spectra of CuCrBO 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 T ≈ 119 K is provided. The influence of the magnetic phase transition on the Raman spectra of CuCrBO is discussed.

Bibliographic Details

Evgeniya Moshkina; Evgeniy Eremin; Maxim Molokeev; Alexander Krylov; Dieter Kokh

MDPI AG

Chemical Engineering; Materials Science; Physics and Astronomy; Chemistry

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