Flux growth and phase diversity of the triple oxides of transition metals (Mn,Fe,Ga)2O3 in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O

Abstract

To determine the mutual influence of the solvent and soluble in multicomponent fluxes based on Bi₂O₃–MoO₃–B₂O₃–Na₂O, the crystallization of the triple oxides of the transition metals (Mn,Fe,Ga)₂O₃ is investigated, namely the phases based on orthorhombic FeGaO₃ and bixbyite FeMnO₃. Simultaneously, a set of fluxes is studied based on the variation in the component ratio with regard to the solvent and soluble. The crucial role of various components of the flux system is considered at the intersection of the phase boundaries. Fluxes for the stable growth of (Mn,Fe,Ga)₂O₃ single crystals of the studied phases (based on orthorhombic FeGaO₃ and bixbyite FeMnO₃) are determined. A set of single crystal samples (9 samples) with different Fe/Mn/Ga ratios is obtained. The actual composition of the samples is studied using the EDX technique. The partition coefficients of Fe₂O₃, Mn₂O₃ and Ga₂O₃ in the studied fluxes are analyzed. The structure of the obtained samples is characterized using X-ray diffraction methods, including the phase composition, space group and lattice parameters. The room temperature Raman spectra of the obtained samples are presented. The distribution of iron cations over the crystal positions in the obtained phases is studied using Mössbauer spectroscopy.