Standard

SAE 2008-01-2863

Nov 2008 Current

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Abstract

This paper describes the development of a lead free, high temperature ceramic capacitor material having the base composition of (Na 0.5 Bi 0.5 ) TiO 3 . The goal is to modify this structure to create a material that has the relative permittivity of barium titanate with extended X7R-like properties to 250°C - an X14R. After an extensive compositional and theoretical modeling investigation a composition was selected and capacitors developed. The dielectric has a 1-kHz relative permittivity of ∼1200 with <±15% variation from -25 to +250°C and <5% loss from -55 to +250°C. These capacitors also have very low voltage coefficients, indeed they are positive at the low end of the temperature range, resulting in a combined T C - Vc capacitance variation 0%/-25% of nominal from -55 to +200°C with applied voltage stress from 20 to 260 V/mil.

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Standard from SAE International
Published: November 11 2008
Document type: IS
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Publisher: SAE International
Distributor: SAE International

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Abstract

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