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Solution combustion synthesis: a straightforward route for the preparation of chromium-doped lanthanum aluminate, LaAl1-xCrxO3, pink red pigments
Dyes and Pigments ( IF 4.5 ) Pub Date : 2018-03-22 , DOI: 10.1016/j.dyepig.2018.03.041
Robert Ianoş , Radu Lazău , Roxana Băbuță , Eliza Muntean , Elena-Alina Moacă , Cornelia Păcurariu

The high exothermicity of the combustion reactions in the La(NO3)3–Al(NO3)3–Cr(NO3)3–urea–glycine system allows the obtaining of LaAl1-xCrxO3 (x = 0.05) pink red pigments directly from the combustion reaction, without any additional annealing. The Al3+ by Cr3+ partial substitution causes a decrease in the combustion temperature from 1721 °C to 1563 °C. The presence of 2 % CaF2 mineralizer causes colour intensification and red hue increase. The LaAl1-xCrxO3 crystallites size varies between 51 nm and 71 nm and the BET specific surface area varies between 3.0 m2/g and 7.3 m2/g. The characteristics of the obtained pigments are correlated with the combustion gases release rate, which in turn depends on the combustion temperature, the resulting volume of gases and the duration of the combustion reactions. Pigment testing has shown that it dissolves in the enamel melt but can be used to obtain water-based acrylic paints.



中文翻译:

固溶燃烧合成:制备掺杂铬的铝酸镧,LaAl 1-x Cr x O 3,粉红色颜料的直接方法

La(NO 33 -Al(NO 33 -Cr(NO 33-尿素-甘氨酸系统中燃烧反应的高放热性使得可以获得LaAl 1-x Cr x O 3(x = 0.05) )粉红色颜料直接来自燃烧反应,无需任何额外的退火处理。通过Cr 3+部分取代的Al 3+导致燃烧温度从1721°C降低到1563°C。2%CaF 2矿化剂的存在会导致颜色增强和红色调增加。LaAl 1-x Cr x O 3微晶尺寸在51nm至71nm之间变化,且BET比表面积在3.0m 2 / g至7.3m 2 / g之间变化。所获得的颜料的特性与燃烧气体的释放速率相关,而燃烧气体的释放速率又取决于燃烧温度,所产生的气体量和燃烧反应的持续时间。颜料测试表明它可溶解在搪瓷熔体中,但可用于获得水性丙烯酸涂料。

更新日期:2018-03-22
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