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Effect of Cooling Rate on the Crystalline Morphology of Bi2O3‐Fe2O3 Pseudo‐Binary System
Ist Teil von
Physica status solidi. A, Applications and materials science, 2023-05, Vol.220 (9), p.n/a
Ort / Verlag
Weinheim: Wiley Subscription Services, Inc
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Herein, the crystallographic morphology of the 80%Bi2O3‐20%Fe2O3 pseudo‐binary system under different cooling rates (100, 6.3, 0.12 K s−1) is investigated using an optical microscopy system. The interfacial morphology evolution and interfacial kinetics in two dimensions during crystal growth are systematically studied. At the low cooling rate (ΔT < 10 K), blade‐like crystals appear slowly in the melt. In turn, the emergence of numerous irregularly shaped grains in the melt at the high cooling rate (ΔT > 100 K) indicates a rapid solidification process. Tetragonal crystals appear typically during melt solidification accompanied with triangular crystals simultaneously (15 K < ΔT < 35 K). The X‐ray diffraction and EDS data reveal that both kinds of polygonal crystals are attributed to Bi25FeO40. In addition, the crystal growth kinetics are presented as the dependence of the growth rate on the subcooling, and thus the growth mechanism of crystals is discussed. According to the results, Bi25FeO40 crystals grow through a two‐dimensional nucleation mechanism.
Herein, the evolution of three different crystal morphologies of Bi2O3‐Fe2O3 pseudo‐binary melt under different cooling rates is investigated by optical microscopy. The growth mechanisms and kinetics of triangular and tetragonal crystals are studied, and the kinetics is presented as the dependence of growth rate on the subcooling. Both crystals evolve through a two‐dimensional growth mechanism.