Synthesis and Characterization of Sr2[Srn−1TinO3n+1] Series by Mechanochemical Activation

Author: Hungría T.   Lisoni J. G.   Moure A.   Pardo L.   Castro A.  

Publisher: Taylor & Francis Ltd

ISSN: 0015-0193

Source: Ferroelectrics, Vol.268, Iss.1, 2002-01, pp. : 399-404

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Abstract

A new synthesis method, based on high-energy milling, has been applied to obtain the n=1 to 3 members of Sr2[Srn−1TinO3n+1] Ruddlesden-Popper series, producing a very important decrease in the temperature and time reactions as compared with the traditional ceramic method. The mechanosynthesis of SrTiO3 was observed during ball milling processes. Similar results were obtained with vibrating and planetarium milling systems, although the time scales involved are shorter when last one was used. The milled samples were annealed at different temperatures up to the formation of the layered perovskites in one single step. Final products as well as milled powders were studied by thermal analysis, infrared absorption spectroscopy and X-ray diffraction. The microstructure of ceramic samples with Sr2TiO4 and Sr3Ti2O7 compositions was investigated.