Premium
Aerosol Codeposition of Ceramics: Mixtures of Bi 2 O 3 –TiO 2 and Bi 2 O 3 –V 2 O 5
Author(s) -
Exner Jörg,
Fuierer Paul,
Moos Ralf
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13364
Subject(s) - ceramic , materials science , calcination , bismuth , stoichiometry , analytical chemistry (journal) , mineralogy , sintering , dielectric , metallurgy , chemistry , catalysis , biochemistry , optoelectronics , chromatography
Aerosol deposition ( AD ) is a promising method to apply ceramic films on a wide range of substrate materials. Until now, AD has mainly been performed using a single ceramic powder. In this work, mixtures of two different ceramic powders were prepared. The first mixture consisted of Bi 2 O 3 and TiO 2 and the second consisted of Bi 2 O 3 and V 2 O 5 , in stoichiometric ratios to form Bi 4 Ti 3 O 12 and Bi 4 V 2 O 11−δ , respectively. Aerosol codeposition produced films with homogeneously distributed particle fractions and thicknesses between 10 and 100 μm. Composite films were annealed to temperatures up to 750°C to enable an in situ calcination and attempted formation of the above‐mentioned compounds. Successful formation of Bi 4 Ti 3 O 12 was tracked by hot‐stage X‐ray diffraction ( XRD ), and confirmed by dielectric measurements. Formation of the intended Bi 4 V 2 O 11−δ , on the other hand, was not achieved, but rather BiVO 4 , which was confirmed by XRD , EDX and electrical measurements. The bismuth deficiency occurred during spray deposition, and is attributed to powder/material characteristics. Additional insight about the AD process is gained by comparing mixtures of oxides with different relative hardness values. Aerosol codeposition of ceramics may be an interesting new technique for producing porous functional ceramics.