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Interactions between bismuth oxide and ceramic substrates for thick film technology

Published online by Cambridge University Press:  31 January 2011

Simona Immovilli ,
Bruno Morten ,
Maria Prudenziati ,
Alessandro Gualtieri  and
Massimo Bersani
Simona Immovilli
Affiliation:
Istituto Nazionale per la Fisica della Materia (INFM) and Department of Physics, University of Modena, 41100 Modena, Italy
Bruno Morten
Affiliation:
Istituto Nazionale per la Fisica della Materia (INFM) and Department of Physics, University of Modena, 41100 Modena, Italy
Maria Prudenziati
Affiliation:
Istituto Nazionale per la Fisica della Materia (INFM) and Department of Physics, University of Modena, 41100 Modena, Italy
Alessandro Gualtieri
Affiliation:
Department of Earth Sciences, University of Modena, 4100 Modena, Italy
Massimo Bersani
Affiliation:
CMBM (Centre of Medical Biophysics and Materials), Povo, Trento, Italy
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Extract

We investigated the interactions between screen printed and fired layers of Bi2O3 and ceramic substrates of alumina and beryllia. It was found that the reaction products are invariably crystalline in nature. Several transitions of Bi2O3 in its polymorphic phases were found to occur on BeO substrates, while newly formed compounds have been observed to grow on alumina substrates, i.e., Al4Bi2O9 on 99.9% Al2O3 and Bi12SiO20 on 96% Al2O3. Bismuth deeply penetrates in the ceramic interstices in all the cases. Until Bi2O3 is not completely reacted, this penetration is diffusion limited (penetration depth , where td is the reaction time) with values of the activation energy ranging from 3.7 ± 0.6 eV (BeO substrate) to 1.4 ± 0.06 eV (96% Al2O3 substrate). It is shown that these processes are notably different to those occurring in PbO/ceramic systems; moreover, they imply different adhesion phenomena of thick films on different substrates.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 1865 - 1874
Copyright
Copyright © Materials Research Society 1998

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