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ISRN Ceramics
Volume 2012 (2012), Article ID 926537, 6 pages
http://dx.doi.org/10.5402/2012/926537
Research Article

Rare Earth-Doped SrTio3 Perovskite Formation from Xerogels

1Department of Innovation Engineering, University of Salento, Via per Monteroni, 73100 Lecce, Italy
2Research Centre ENEL, Litoranea Salentina Brindisi-Casalabate, Cerano, 72020 Tuturano, Italy
3Salentec srl, Via dell’Esercito, 73020 Cavallino, Italy

Received 23 August 2012; Accepted 21 September 2012

Academic Editors: O. Dymshits and S. Gutzov

Copyright © 2012 Anastasia Rocca et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A synthesis process of rare earth doped SrTiO3 by modified sol-gel technique is described. Impervious strontium titanate doped with rare earth was prepared by gelification and calcination of colloidal systems. Powders of thulium substituted strontium titanate ( -δ, where ; 0.02; 0.05) were obtained through cohydrolysis of titanium, strontium, and thulium precursors by sol-gel method. The xerogel obtained from the evaporation of solvents was milled and calcinated at 1100°C to give a reactive powder. Pure and doped SrTiO3 dense disks were formed by uniaxial pressing. Thermogravimetry (TGA), differential scanning calorimetry (DSC) analysis, X-ray diffractometry (XRD), and scanning electron microscopy (SEM) have been used to study the microstructural evolution of amorphous xerogel into crystalline reactive and sinterable powders. Hardness was measured for each membrane by a Vickers microindenter. Dilatometric and TGA-DSC in pure CO2 flow tests have been performed to evaluate, respectively, the thermal and chemical stability of the material. The optimized preparation route has allowed to synthesize highly reactive easy sintering powders used for fully densified, impervious ceramics with high thermal and chemical stability at high temperature.