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Structural and spectroscopic characterization of Al2−x Cr x O3 powders obtained by polymeric precursor method

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Abstract

Al2O3 and Al2−x Cr x O3 (x = 0.01, 0.02 and 0.04) powders have been synthesized by the polymeric precursors method. A study of the structural evolution of crystalline phases corresponding to the obtained powders was accomplished through X-Ray Diffraction and UV-vis spectroscopy (reflectance spectra and CIEL*a*b* color data). The obtained results allow to identify the γ-Al2O3 to α-Al2O3 phase transition. The single-phase α-Al2O3 powder was obtained after heat treatment at 1050 °C for 2 h. The results show that the green to red color transition and ruby luminescence lines observed for the powders of Al2−x Cr x O3 are related to the γ to α-Al2O3 phase transition and the temperature and time range for such transition depends on the chromium content.

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Acknowledgments

The authors gratefully acknowledge the financial support of the Brazilian financing agencies FAPESP/CEPID and CNPq.

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Authors and Affiliations

  1. Laboratório Interdisciplinar de Materiais Cerâmicos, Centro Interdisciplinar de Pesquisa e Pós-Graduação, Universidade Estadual de Ponta Grossa, Av. Gal. Carlos Cavalcanti, 4748, Campus – Uvaranas, CEP 84035-900, Ponta Grossa – PR, Brazil

    Sergio Cava & Sergio M. Tebcherani

  2. Departamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, CP 476, Campus Universitário, CEP 88040-900,, Florianópolis – SC, Brazil

    Renata Benincá

  3. Laboratório Interdisciplinar em Cerâmica, Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista, R. Francisco Degni, s/n, Bairro Quitandinha, CEP 14800-900,, Araraquara – SP, Brazil

    Iedo A. Souza, Elson Longo & José A. Varela

  4. Departamento de Engenharia Mecânica, Universidade Federal do Rio Grande do Norte, Campus Universitário, S/N, Lagoa Nova, CEP 59072-970, Natal, RN, Brasil

    Carlos A. Paskocimas

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  1. Sergio Cava
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  2. Renata Benincá
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  3. Sergio M. Tebcherani
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  4. Iedo A. Souza
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  5. Carlos A. Paskocimas
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  6. Elson Longo
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  7. José A. Varela
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Correspondence to Sergio Cava.

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Cava, S., Benincá, R., Tebcherani, S.M. et al. Structural and spectroscopic characterization of Al2−x Cr x O3 powders obtained by polymeric precursor method. J Sol-Gel Sci Technol 43, 131–136 (2007). https://doi.org/10.1007/s10971-007-1541-y

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  • DOI: https://doi.org/10.1007/s10971-007-1541-y

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