High permittivity and low loss ceramics in the BaO-SrO-Nb{sub 2}O{sub 5} system

Journal Article · Thu Jun 01 00:00:00 EDT 1995 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(95)00070-4· OSTI ID:82649

Sreemoolanadhan, H; Sebastian, M T ^[1]; Mohanan, P ^[2]

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1. Regional Research Lab., Thiruvanathapuram (India)
2. Cochin Univ. Science & Tech., Kochi (India). Dept. of Electronics

A new group of compounds with composition (Ba{sub 5{minus}X}Sr{sub x})Nb{sub 4}O{sub 15}, having high permittivity and low loss have been prepared and characterized in the microwave frequency region. X-ray diffraction studies showed that monophase compound existed for all values of x from 0 to 5. Microwave dielectric properties such as {var_epsilon}{sub r} and {tau}{sub f} showed smooth variation with x, while the unloaded quality factor (Q{sub u}) showed remarkable improvement with x. A range of ceramic dielectric resonators (DR) with 40 < {var_epsilon}{sub r} < 50, {minus}10 < {tau}{sub f} < +10 and Q {times} f > 10,000 can be obtained in this system.

• OSTI ID: 82649
• Journal Information: Materials Research Bulletin, Vol. 30, Issue 6; Other Information: PBD: Jun 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBATES
SYNTHESIS
DIELECTRIC PROPERTIES
BARIUM COMPOUNDS
STRONTIUM COMPOUNDS
OXIDES
CARBONATES
CALCINATION
SINTERING
MICROWAVE RADIATION
X-RAY DIFFRACTION
SCANNING ELECTRON MICROSCOPY
DIELECTRIC MATERIALS
SOLID SOLUTIONS