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首页> 外文期刊>Journal of thermal analysis and calorimetry >The influence of concentration of doping elements on anatase– rutile transformation at the synthesis of rutile pigments (Ti,Cr,Nb)O_2 and their pigmentary properties
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The influence of concentration of doping elements on anatase– rutile transformation at the synthesis of rutile pigments (Ti,Cr,Nb)O_2 and their pigmentary properties

机译：The influence of concentration of doping elements on anatase– rutile transformation at the synthesis of rutile pigments (Ti,Cr,Nb)O_2 and their pigmentary properties

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摘要

An analysis of the effects of dopants concentration and different starting titanium compounds on the anatase to rutile phase transformation at the synthesis of rutile pigments Ti_(1-3x)Cr_xNb_(2x)O_2±d is presented in this study. The main goal was to analyze reaction mixtures for x = 0.05 (previous study) and 0.30 by simultaneous TG– DTA analysis and to determine the temperature of anatase– rutile transition. For x = 0.05, initial temperatures 760–830 °C are needful for a formation of rutile structure. The temperature is the lowest for the hydrated Na_2Ti_4O_9 paste (760 °C) and similar for other starting compounds of titanium. But for x = 0.30, the anatase–rutile transition begins at higher temperatures 910–1,030 °C because of high-Nb content, which is the inhibitor of this modification change. In addition, we found the influence of calcination temperatures (850, 900, 950, 1000, 1050, 1100, and 1150 °C) on color properties and particle size distribution of these materials prepared from anatase TiO_2 and with x = 0.30. Selected pigments were also analyzed by X-ray powder diffraction.

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