Ca[sub 5]Nb[sub 2]TiO[sub 12] and Ca[sub 5]Ta[sub 2]TiO[sub 12]: Low temperature coefficient low loss dielectric materials

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(99)00036-7· OSTI ID:6443793

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. NIST, Gaithersburg, MD (United States)

The 1 MHz dielectric properties for single-phase polycrystalline ceramics of the Ca[sub 5]Nb[sub 2]TiO[sub 12] and Ca[sub 5]Ta[sub 2]TiO[sub 12] perovskites are reported. In the vicinity of ambient temperature, the dielectric constants are approximately 35 and 23, respectively, and the dielectric losses are low, with Qs on the order of 5,000, the upper limit of the authors' measurement technique. Ceramics with a temperature coefficient of dielectric constant (TCK) less than 5 ppm/[degree]C are reported. The dielectric properties are found to be systematically dependent on processing conditions. The data suggest that an order-disorder transition among the B-site ions plays a major role in the determination of the temperature-dependence of the dielectric constant for both compounds.

• OSTI ID: 6443793
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 34:3; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
MINERALS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
TANTALUM COMPOUNDS
TANTALUM OXIDES
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS