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Aerosol Co-Deposition of Bi2O3 and TiO2 and in-situ formation of Bi4Ti3O12

Title data

Exner, Jörg ; Fuierer, Paul ; Moos, Ralf:
Aerosol Co-Deposition of Bi2O3 and TiO2 and in-situ formation of Bi4Ti3O12.
2014
Event: Electroceramics XIV , 16.-20.06.2014 , Bucharest, Romania.
(Conference item: Conference , Other Presentation type)

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Project information

Project title:
Project's official titleProject's id
No informationMo 1060/20

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Bismuth titanate (Bi4Ti3O12) is a well known ferroelectric ceramic exhibiting a high Curie temperature (TC = 675°C) and offering possible applications like lead-free, high temperature, high-κ capacitor and piezoelectric devices. Our objective is to deposit Bi4Ti3O12 films by a novel spray coating method called aerosol deposition (AD or room temperature impact consolidation (RTIC)).

In contrast to common AD, we co-sprayed the starting materials (Bi2O3 and TiO2) together and achieved the final crystal structure by a subsequent heat treatment of the film (post-deposition calcination). Sprayed powders were prepared by mixing commercially available Bi2O3 and TiO2 powders (of stoichiometric ratio) in a planetary ball mill and dryed at 200°C. The AD process was performed using a custom-made AD apparatus. Resulting layers were investigated by SEM and high temperature XRD analysis.

Films of the Bi2O3/TiO2-mixture with thicknesses between 10 and 50 μm were deposited on alumina and silicon. Cross-sectional SEM-images reveal that harder TiO2-particles get embedded in a continuous Bi2O3-matrix during deposition leading to a dense compound layer (as-deposited state). By heat treating the film at 750°C for 5 h, the solid state reaction transforms the compound to a porous Bi4Ti3O12 layer.

Further data

Item Type: Conference item (Other)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 12 May 2015 12:11
Last Modified: 15 Apr 2016 08:01
URI: https://eref.uni-bayreuth.de/id/eprint/13171