Thermogravimetric and UV-vis spectroscopic studies of chromium redox reactions in rutile pigments

被引：9
|
作者：
Vieira, F. T. G. [1 ]
Souza, Soraia C. [1 ]
Oliveira, A. L. M. [1 ]
Lima, S. J. G. [2 ]
Longo, E. [3 ]
Paskocimas, C. A. [4 ]
Soledade, L. E. B. [1 ]
Souza, A. G. [1 ]
Santos, Ieda M. G. [1 ]
机构：
[1] Univ Fed Paraiba, Lab Combust & Mat, Dept Quim, BR-58059900 Joao Pessoa, Paraiba, Brazil
[2] Univ Fed Paraiba, LSR, Dept Engn Mecan CT, BR-58059900 Joao Pessoa, Paraiba, Brazil
[3] UNESP, Inst Quim, LIEC, CMDMC, Araraquara, SP, Brazil
[4] Univ Fed Rio Grande do Norte, Dept Mat Engn, BR-59072970 Natal, RN, Brazil
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2009年 / 97卷 / 01期
关键词：
Pechini; Thermal analysis; TiO2; Redox reactions; CERAMIC PIGMENTS; COUNTERIONS MO; CR; MN; NI; SB; ANATASE; COLOR; NB; CO;
D O I：
10.1007/s10973-009-0074-8
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this study undoped and Cr, Sb or Mo doped TiO2 were synthesized by polymeric precursor method and characterized by X-ray diffraction, UV-VIS spectroscopy, infrared spectroscopy and thermogravimetry (TG). The TG curves showed a continuous mass loss assigned to the hydroxyl elimination and Cr6+ reduction. Doped TiO2 samples showed a higher mass loss assigned to water and gas elimination at lower temperatures. In these doped materials a decrease in the anatase-rutile phase transition temperature was observed. After calcination at 1,000 A degrees C, rutile was obtained as a single phase material without the presence of Cr6+.
引用
收藏
页码：99 / 103
页数：5
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