Multicomponent flux growth and composition control of Cu<sub>2</sub>MnBO<sub>5</sub>:Ga ludwigites

Moshkina, Evgeniya; Крылов, А. С.; Kokh, Dieter; Shabanova, Ksenia; Мolokeev, Maxim S.; Bovina, A. F.; Plyaskin, Mikhail E.; Rostovtsev, Nikita; Безматерных, Л. Н.

doi:10.1039/d2ce00258b

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…This confirms a high degree of the structural cationic order in this compound. It is greater than in the Cu2MnBO5 ludwigite, which can easily be distinguished among the previously studied ludwigites in terms of Raman spectroscopy [17].…”

Section: Discussionmentioning

confidence: 70%

“…The crystals are represented with grey-green hexagonal plates [16]. There is usually a thermal limit at T = 1000 • C whenworking with copper-containing fluxes due to the decomposition of CuO at higher temperatures, accompanied by the appearance of Cu + 2 O and liberation of oxygen [17]. It is worth noting that in the case of Mn-and Fe-containing systems, CuO is also decomposed above T = 1000 • C, which manifests itself as sublimation of the flux upon the addition of CuO.…”

Section: Results Of the Flux Growth Studymentioning

confidence: 99%

“…The dependence of the intensity of Raman lines on the rotation angle of Cu 2 CrBO 5 (Figure 5) can be compared with other copper ludwigites. In analyzing other coppercontaining ludwigites which are also monoclinic, phase shifts were detected in broad spectral ranges in the area of the Me-O octahedra and lattice vibrations [17]. The phase shift was different from 45 • and 90 • in the HV and HH modes, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…The Raman spectra of Cu 2 CrBO 5 are in agreement with the dataobtained earlier for other ludwigites in terms of the range division and spectral structure. Apart from this, there is an interesting disagreement in terms of both monoclinic ludwigites with different distortion types [6,17] and orthorhombic ones [22,23]. The change in the sample color (dark brown) with respect to the manganese ludwigites (black) studied earlier led to a greater intensity of the spectra.…”

Section: Raman Spectroscopy Studymentioning

confidence: 91%

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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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Section: Discussionmentioning

confidence: 70%

Section: Results Of the Flux Growth Studymentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Raman Spectroscopy Studymentioning

confidence: 91%

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Flux Growth and Raman Spectroscopy Study of Cu2CrBO5 Crystals

Moshkina,

Eremin,

Molokeev

et al. 2023

Crystals

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“…На сегодняшний день, оксиды переходных металлов являются широко исследованным классом соединений с подробно проработанными фазовыми диаграммами двойных и многих тройных систем [1][2][3][4]. Биксбиит MnFeO 3 , изоструктурный оксиду марганца β-Mn 2 O 3 , не является исключением -он известен уже более полувека и насчитывается значительное количество трудов, посвященных свойствам данного соединения [1][2][3][4][5][6][7][8][9]. Однако, наблюдается некоторая неоднозначность магнитных свойств MnFeO 3 в зависимости от метода получения.…”

Section: Introductionunclassified

Влияние Ga-замещения на структурные и магнитные свойства биксбиита (Mn,Fe)-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-

Мошкина¹,

Мolokeev²,

Еремин³

et al. 2023

Физика Твердого Тела

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To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 with the bixbyite structure on the composition, the temperature dependences of the magnetization and ac magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The dc magnetization and ac magnetic susceptibility of Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 bixbyites have been studied. Despite the qualitatively similar behavior of the magnetic properties, significant differences were also found, despite a small difference in the Mn/Fe/Ga ratio in the samples under study. It is shown that both compounds experience two successive low-temperature magnetic phase transitions from the paramagnetic phase at T = 20–32 K as the temperature is lowered. Calculations of the Mydosh parameter for the detected phase transitions showed different degrees of ordering in the compounds under study.

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