研究目的
To synthesize oxides with the perovskite structure of LaFeO3, LaFe0.8Al0.2O3 and LaFe0.8Cr0.2O3 by proteic sol-gel, aiming their application as ceramic pigments.
研究成果
The proteic sol-gel method was effective in synthesizing monophasic and nanometric powders of LaFeO3, LaFe0.8Al0.2O3, and LaFe0.8Cr0.2O3. The method is simple, fast, and economical compared to other traditional methods. The substitution of Fe3+ by Al3+ and Cr3+ did not significantly alter the crystalline structure of the perovskite. The LF and LFA samples presented pastel tones, lighter with Al3+ substitution, while the LFC sample presented a light brown color due to the superposition of the chromophore bands of Fe3+ and Cr3+.
研究不足
The study focuses on the synthesis and characterization of the materials, with limited discussion on the practical application as ceramic pigments in industrial settings.
1：Experimental Design and Method Selection:
The oxides were synthesized using the proteic sol-gel method, with gelatin as the organic director.
2：Sample Selection and Data Sources:
The reagents used were aluminum nitrate nonahydrate, lanthanum nitrate hexahydrate, iron(III) nitrate nonahydrate, and chromium nitrate nonahydrate.
3：List of Experimental Equipment and Materials:
The powders were characterized by X-ray diffraction with Rietveld refinement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy, and CIE-L*a*b* colorimetry.
4：Experimental Procedures and Operational Workflow:
The resulting polymeric gel was calcined at 400 °C to eliminate organic matter, followed by calcination at 600 and 800 °C for 4 hours to obtain the perovskite phase.
5：Data Analysis Methods:
The XRD patterns were analyzed with Rietveld refinement using the MAUD software.
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