Defects and Degradation of BaTiO3 Codoped with Dy and Mn

概要

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High-temperature electrical conductivities and leakage current behaviors of Dy-doped, and Dy and Mn codoped BaTiO3 were investigated as a function of Ba/Ti ratio. Dy-doped BaTiO3 specimens showed higher leakage currents under a continuously applied dc field stress at 150°C than undoped BaTiO3. The highest initial leakage current was observed with Ba(Ti0.98Dy0.02)O2.99. The equilibrium electrical conductivity of Ba(Ti0.985Dy0.01Mn0.005)O3 is proportional to Po$_{2}^{-1/4}$ in the n-type region, and Po$_{2}^{+1/6}$ in the p-type region. The conductivity behavior of (Ba0.99Dy0.01)(Ti0.995Mn0.005)O3 is similar to the previous results on the donor-doped BaTiO3. Regardless of the occupation site of Dy ions, BaTiO3 specimens codoped with Dy and Mn showed lower leakage currents, and the leakage current of (Ba0.99Dy0.01)(Ti0.995Mn0.005)O3 was below $10^{-10}$ A under the same conditions.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-02-15