Low-temperature synthesis of high-purity BiFeO3 via carbonized metal citrate xerogel
Bi/Fe-citrate xerogel, prepared by sol-gel processing, was first carbonized and, then, calcined at 300–700 °C for 1 h. The gel and its calcination products were characterized by thermal analyses (TG/DTA), X-ray powder diffractometry (XRD), Fourier-transform infrared spectrophotometry (FTIR), BET-spe...
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Published in | Journal of alloys and compounds Vol. 843; p. 155928 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
30.11.2020
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | Bi/Fe-citrate xerogel, prepared by sol-gel processing, was first carbonized and, then, calcined at 300–700 °C for 1 h. The gel and its calcination products were characterized by thermal analyses (TG/DTA), X-ray powder diffractometry (XRD), Fourier-transform infrared spectrophotometry (FTIR), BET-specific surface area measurement (SBET), and Ultraviolet–Visible diffuse reflectance spectrometry (UV–Vis DRS). It was found that the carbonization step helps to subside the effects of a glowing thermal decomposition event, thus suppressing the formation of parasitic phases (such as Fe2O3 and Bi2Fe4O9). Rhombohedral-BiFeO3 yielded at 500 °C was found to assume qualifying properties for photo-assisted applications.
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•Bi/Fe-citrate xerogel is obtained via sol-gel processing and drying at 80 °C.•Thermal decomposition (in air) of the gel encompasses a glowing event near 300 °C.•Impacts of the heat released are subsided via 400 °C pre-carbonization of the gel.•Consequently, 500 °C calcination of the carbonized gel yields pure BiFeO3.•The BiFeO3 assumes qualifying properties for photo-assisted applications. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2020.155928 |