High Dielectric Constant Negative-Positive-Zero Dielectric Materials Based on (100-x)(La<sub>0.1</sub>Bi<sub>0.9</sub>)Ti<sub>2</sub>O<sub>7-x</sub>SrTiO<sub>3</sub>

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  • Nakano Atsuyuki
    TDK Corporation, Materials Research Center, Narita, Chiba 286, Japan
  • Cann David P.
    Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
  • Shrout Thomas R.
    Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA

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タイトル別名
  • High Dielectric Constant Negative-Positive-Zero Dielectric Materials Based on (100-x)(La0.1Bi0.9)Ti2O7-xSrTiO3.
  • High Dielectric Constant Negative Posit

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Dielectric materials based on the solid solution system (100-x)( La0.1Bi0.9) Ti2O7-xSrTiO3 have been studied in order to obtain high performance capacitor materials. Compositions with temperature coefficient of capacitance as low as τ c<20 ppm and dielectric constant as high as 250 make them suitable for negative-positive-zero (NPO) capacitor designated applications. Using X-ray diffraction, a three-phase mixture of the two end members, SrTiO3, ( La0.1Bi0.9) Ti2O7, and a Bismuth-layer structure phase with only a limited amount of solid solution was observed. The low-temperature coefficient of capacitance was believed to be the result of the balancing of the positive and negative temperature coefficients characteristic of the three constituent phases.

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