High temperature ceramic dielectric composition and capacitors made from the composition
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United States of America Patent
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Dec 13, 2011
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app pub date -
Apr 22, 2009
filing date -
Apr 23, 2008
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Abstract
A bismuth sodium titanate (Bi.sub.0.5Na.sub.0.5TiO.sub.3) base material is modified by the partial substitution of aliovalent A-site cations such as barium (as BaO) or strontium (as SrO), as well as certain b-site donor/acceptor dopants and sintering aids to form a multi-phase system, much like known 'core/shell' X7R dielectrics based solely on BaTiO.sub.3. The resulting ceramic dielectric composition is particularly suitable for producing a multilayer ceramic capacitor (10) that maintains high dielectric constant (and thus the capability of maintaining high capacitance) over a broad temperature range of from about 150.degree. C. to about 300.degree. C. Such capacitors (10) are appropriate for high temperature power electronics applications in fields such as down-hole oil and gas well drilling.
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