Journal of Materials Science

, Volume 32, Issue 6, pp 1449–1453 | Cite as

Calcium-doping effect on temperature coefficients of dielectric constants in SrTiO3 capacitors

  • A KOGA


SrTiO3 ceramic capacitors were studied to improve the temperature coefficient, τ, of dielectric constants without decreasing the dielectric constants. It was indicated that an addition of calcium in an insulating reagent improved τ. From scanning electron microscopy and energy-dispersive X-ray analysis measurements, the origin of this improvement was ascribed to the following layers: (1) the oxide layers which were formed at the grain boundaries, and (2) the bismuth-oxide layers which were formed on the sample surface.


Dielectric Constant Calcium Content Sintered Sample Bismuth Oxide Sintered Body 


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  1. 1.
    A. YAMAZI, S. WAKU and N. T. T. RES,Appl. Pept. 18 (1969) 3431.Google Scholar
  2. 2.
    N. YAMAOKA,Ceram. Bull. 62 (1983) 698.Google Scholar
  3. 3.
    S. WAKU,Denkitusingakkaisi 49 (1962) 1285.Google Scholar
  4. 4.
    G. A. SAMARA,Phys. Rev. 151 (1966) 378.CrossRefGoogle Scholar
  5. 5.
    S. MARZULLO and E. N. BUNTING, J. Am. Ceram. Soc. 43 (1960) 609.CrossRefGoogle Scholar
  6. 6.
    K. OKAZAKI, in “Ceramic Engineering for dielectrics”, edited by Gakkensya (1983) pp. 277-80.Google Scholar
  7. 7.
    H. MASUMURA,Electron. Ceram. (1974) 140.Google Scholar
  8. 8.
    S. KOZINSKI et al.,Bull. Polish Acad. Sci. 37 (1989) 385.Google Scholar
  9. 9.
    P. E. C. FRANKEN, M. P. A. VIEGERS and A. P. GEHRING,J. Am. Ceram. Soc. 64 (1981) 687.CrossRefGoogle Scholar
  10. 10.
    K. ITO, S. SHIBAGAKI, J. TANAKA, H. HANEDA, S. HISHITA, M. YOKOYAMA, Y. BANDO and S. SHIRASAKI,Seramikkusu Ronbunshi98 (1990) 831.CrossRefGoogle Scholar

Copyright information

© Chapman and Hall 1997

Authors and Affiliations

    • 1
  • A KOGA
    • 2
  1. 1.Advanced Technology Research LaboratorySumitomo Metal Industries LtdAmagasaki HyogoJapan
  2. 2.National Institute for Research in Inorganic MaterialsTsukuba IbarakiJapan

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