Energy Storage in Ceramic Dielectrics

摘要: Historically, multilayer ceramic capacitors (MLC's) have not been considered for energy storage applications two primary reasons. First, physically large were very expensive and, second, total density obtainable was nearly so high as in electrolytic capacitor types. More recently, the fabrication technology MLC's has improved significantly, permitting both significantly higher and lower costs. Simultaneously, many applications, become smaller, secondary requirements of low effective series resistance inductance (which, together, determine how efficiently may be stored recovered) more important. It is therefore desirable to reexamine ceramics contemporary commercial near-commercial dielectrics. Stored proportional voltage squared only case paraelectric insulators, because they capacitance that independent bias voltage. High dielectric constant materials, however, are ferroics (that ferroelectric and/or antiferroelectric) display significant variation with The common whether based upon barium titanate or lead manganese niobate (PMN), high-field limit, exhibit an which increases linearly Mixed phase, plus antiferroelectric, dielectrics from lanthanum zirconate (PLZT) system, predicted theoretically, show best at moderate fields. Surprisingly, maximum obtained materials but those intermediate highest ultimate breakdown voltages.