Low temperature coefficient bulk dielectrics in the Ca2Nb2O7-Ca2Ta2O 7 system

R. J. Cava, J. J. Krajewski, R. S. Roth

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The dielectric properties of bulk polycrystalline ceramics in the binary Ca2Ta2O7-Ca2Nb2O 7 system are reported. Measurements of the dielectric constant at 1 MHz were made at temperatures between O and 100°C. The large negative (for the niobate) and positive (for the tantalate) temperature coefficients for the dielectric constants in the pure materials in the vicinity of room temperature can be balanced in a two-phase region near x = 0.36 in Ca2Ta2-xNbxO7. At this composition, the dielectric constant is approximately 30, and the temperature coefficient of the dielectric constant is approximately 2 ppm/°C. The Q in our unoptimized polycrystalline ceramic at 1 MHz is approximately 5000.

Original languageEnglish (US)
Pages (from-to)527-532
Number of pages6
JournalMaterials Research Bulletin
Issue number4
StatePublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


  • A. ceramics
  • A. oxides
  • D. dielectric properties


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