Low temperature coefficient bulk dielectrics in the Ca{sub 2}Nb{sub 2}O{sub 7}-Ca{sub 2}Ta{sub 2}O{sub 7} system

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(98)00002-6· OSTI ID:616349

Cava, R J; Krajewski, J J ^[1]; Roth, R S ^[2]

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1. Lucent Technologies, Murray Hill, NJ (United States). Bell Labs.
2. National Inst. of Standards and Technology, Gaithersburg, MD (United States)

The dielectric properties of bulk polycrystalline ceramics in the binary Ca{sub 2}Ta{sub 2}O{sub 7}-Ca{sub 2}Nb{sub 2}O{sub 7} system are reported. Measurements of the dielectric constant at 1 MHz were made at temperatures between 0 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 Ca{sub 2}Ta{sub 2{minus}x}Nb{sub x}O{sub 7}. At this composition, the dielectric constant is approximately 30, and the temperature coefficient of the dielectric constant is approximately 2 ppm/{degree}C. The Q in the unoptimized polycrystalline ceramic at 1 MHz is approximately 5,000.

• OSTI ID: 616349
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
DIELECTRIC PROPERTIES
NIOBIUM OXIDES
POLYCRYSTALS
TANTALUM OXIDES
TEMPERATURE DEPENDENCE