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Title: Influence of processing route on electrical properties of Bi{sub 4}Ti{sub 3}O{sub 12} ceramics obtained by tape-casting technology

Highlights: • Bi{sub 4}Ti{sub 3}O{sub 12} thick films were obtained by SSR and PPM methods. • Both systems crystallize in an orthorhombic structure. • Textured characteristics were evidenced. • Grain morphology affects the P–E loops. - Abstract: Bismuth titanate powders (Bi{sub 4}Ti{sub 3}O{sub 12}-BIT) were fabricated by solid state reaction (SSR) and polymeric precursor method (PPM). From these powders, Bi{sub 4}Ti{sub 3}O{sub 12} pellets were obtained by tape-casting using plate-like templates particles prepared by a molten salt method. The BIT phase crystallizes in an orthorhombic structure type with space group Fmmm. Agglomeration of the particles, which affects the densification of the ceramic, electrical conduction and leakage current at high electric fields, was monitored by transmission electronic microscopy (TEM) analyses. FEG-SEM indicated that different shape of grains of BIT ceramics was influenced by the processing route. Both SSR and PPM methods lead to unsaturated P–E loops of BIT ceramics originating from the highly c-axis orientation and high conductivity which was affected by charge carriers flowing normally to the grain boundary of the crystal lattice.
Authors:
 [1] ; ;  [2] ;  [3] ;  [1] ;  [2]
  1. São Paulo State University, UNESP – Engineering Faculty, Guaratinguetá, SP 12516-410 (Brazil)
  2. São Paulo State University, UNESP – Chemistry Institute, Araraquara, SP 14800-900 (Brazil)
  3. Institute for Multidisciplinary Research, University of Belgrade, Kneza Viseslava 1, Belgrade (Serbia)
Publication Date:
OSTI Identifier:
22475884
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 70; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AGGLOMERATION; BISMUTH COMPOUNDS; CASTING; CERAMICS; CHARGE CARRIERS; ELECTRIC FIELDS; ELECTRICAL PROPERTIES; GRAIN BOUNDARIES; LEAKAGE CURRENT; MOLTEN SALTS; ORTHORHOMBIC LATTICES; PRECURSOR; SCANNING ELECTRON MICROSCOPY; SOLIDS; SPACE GROUPS; SYNTHESIS; TITANATES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION