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

页码：99 / 103

页数：5

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