Synthesis, structural refinement and optical behavior of CaTiO3 powders:: A comparative study of processing in different furnaces

被引：199

作者：

Cavalcante, L. S. ^{[1
]}

Marques, V. S. ^{[2
]}

Sczancoski, J. C. ^{[1
]}

Escote, M. T. ^{[3
]}

Joya, M. R. ^{[1
]}

Varela, J. A. ^{[4
]}

Santos, M. R. M. C. ^{[2
]}

Pizani, P. S. ^{[1
]}

Longo, E. ^{[4
]}

机构：

[1] Univ Fed Sao Carlos, LIEC, Dept Quim & Fis, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Piaui, Dept Quim, Ctr Ciencias Nat, Teresina, PI, Brazil

[3] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Santo Andre, SP, Brazil

[4] Univ Estadual Paulista, LIEC IQ, BR-14801907 Araraquara, SP, Brazil

来源：

CHEMICAL ENGINEERING JOURNAL | 2008年 / 143卷 / 1-3期

基金：

巴西圣保罗研究基金会;

关键词：

CaTiO3; optical materials; heat treatment; Rietveld refinement; microwave effects;

D O I：

10.1016/j.cej.2008.05.017

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Calcium titanate (CaTiO3) powders were synthesized by the polymeric precursor method and processed in different furnaces. The structural evolution of CaTiO3 powders heat treated in conventional furnace and adapted domestic microwave oven was analyzed by X-ray diffraction (XRD), micro-Raman scattering (MRS) spectroscopy and ultraviolet-visible (UV-vis) absorption spectroscopy. XRD, MRS and Rietveld refinement revealed that the CaTiO3 powders heat treated in both furnaces are free of deleterious phases and crystallize in an orthorhombic structure. UV-vis measurements suggested the presence of intermediary energy levels into the optical band gap of structurally disordered CaTiO3 powders. CaTiO3 powders heat treated in microwave oven showed a rapid structural organization than powders heat treated in conventional furnace. The optical absorption values revealed a different behavior due to the changes in the structural order-disorder degree of the CaTiO3 lattice. The differences verified in the heating process of CaTiO3 powders processed in conventional furnace and adapted domestic microwave oven were discussed. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：299 / 307

页数：9

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