کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
176451 | 458943 | 2013 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Lanthanum cobaltite black pigments with perovskite structure Lanthanum cobaltite black pigments with perovskite structure](/preview/png/176451.png)
• Black pigments with stoichiometry La1−xCaxCoO3 were obtained by the Pechini method.
• The dark color was obtained with the use of only one transition metal.
• Substitution of Ca for La did not influence pigment color but decreased its cost.
In this work La1−xCaxCoO3 (x = 0–0.4) pigments were synthesized by the polymeric precursor method with heat treatments at 700, 800 and 900 °C for 4 h. The powders were characterized by colorimetry, UV–vis spectroscopy and powder X-ray diffraction (XRD). The X-ray diffraction patterns showed the presence of a single phase perovskite, changing its structure from rhombohedral to cubic, when calcium was added to the lattice. All of the pigments had a black colour with a strong absorption over the whole of the visible spectrum as a consequence of the different oxidation states of cobalt and the high short-range disorder. The substitution of Ca2+ for La3+ did not influence the pigment colour but decreased its final cost.
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Journal: Dyes and Pigments - Volume 98, Issue 3, September 2013, Pages 459–463