Electrophoretic deposition and constrained sintering of strontium titanate thick films
authors Amaral, L; Vilarinho, PM; Senos, AMR
nationality International
journal MATERIALS CHEMISTRY AND PHYSICS
author keywords Ceramics; Electrophoretic deposition; Dielectric properties; Insulators; Electron microscopy; Strontium titanate
keywords DIELECTRIC-PROPERTIES; CERAMICS; BALA4TI4O15; LAMINATE; GROWTH; MICROSTRUCTURE; FABRICATION; KINETICS; EPD
abstract Thick films of functional oxides are currently substituting counterparts bulk ceramics, as in the case of low loss dielectrics. For SrTiO3 (ST) based compositions it is demonstrated that electrophoretic deposition (EPD), using acetone as a suspension media with iodine addition, is a suitable technology to fabricate 12 mu m thick films. The microstructural analysis of the films sintered at 1500 degrees C shows that highly densified microstructures can be obtained and, by slightly varying the Sr/Ti stoichiometry in the powder composition, increased densification and grain size and enlargement of the distribution with decreasing Sr/Ti ratio can be observed. In spite of the high densification of the films, it is also demonstrated that due to the constraint imposed by the substrate a smaller grain size is observed in thick films as compared to equivalent bulk ceramics. In addition, a preferential vertical pore orientation is observed in ST thick films. These results may have broad implications if one considers that the dielectric losses and dielectric tunability is affected by pore orientation, since it affects the electric field distribution. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0254-0584
year published 2015
volume 149
beginning page 445
ending page 452
digital object identifier (doi) 10.1016/j.matchemphys.2014.10.043
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000347576900062
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  impact metrics
times cited (wos core): 2
journal impact factor (jcr 2016): 2.084
5 year journal impact factor (jcr 2016): 2.283
category normalized journal impact factor percentile (jcr 2016): 56.909
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