Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 153

Full Record for Micrograph 153

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Micrograph no
153
Brief description
Barium Titanate Ag/Pd Multilayer Capacitor
Keywords
barium, barium titanate, ceramic Link to MATTER Glossary entry for ceramic, electroceramic Link to MATTER Glossary entry for electroceramic, lead Link to MATTER Glossary entry for lead, multilayer capacitor Link to MATTER Glossary entry for multilayer capacitor, oxygen Link to MATTER Glossary entry for oxygen, silver, titanium
Categories
Ceramic
System
BaTiO3 Ag/Pd
Composition
BaTiO3
Standard codes
Reaction
Processing
A barium titanate slurry is tape cast to give a thin sheet which is dried and a paste or ink containing the Ag/Pd powder is screen printed on it. The large sheets are then diced, stacked and co-sintered together.
Applications
Any electrical circuit or product requiring capacitors i.e. most of them including TV’s, videos and computers.
Sample preparation
Polished but unetched.
Technique
Reflected light microscopy
Length bar
300 μm
Further information
The light metal layers are shown edge on alternating with the ceramic layers. This sandwich configuration maximises the area of contact and so capacitance of the MLC. Thin ceramic layers are also desired to maximise capacitance. See the equation for a parallel plate capacitor.
Contributor
Prof W E Lee
Organisation
Department of Engineering Materials, University of Sheffield
Date
10/05/02
Licence for re-use
Attribution-NonCommercial-ShareAlike 4.0 International