Microstructure and microwave dielectric characteristics of (1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} ceramics

Journal Article · Tue Nov 06 04:00:00 EST 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.12.009· OSTI ID:21062246

Yang, Y -S ^[1]; Yang, C-F ^[2]; Chung, H -H ^[3]; Huang, C -J ^[4]; Diao, C -C ^[1]

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1. Department of Electronic Engineering, Kao Yuan University, Kaohsiung, Taiwan (China)
2. Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung, Taiwan (China)
3. Department of Mechanical and Automation Engineering, Kao Yuan University, Kaohsiung, Taiwan (China)
4. Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan (China)

(1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} (0.1 {<=} x {<=} 0.85) composites are prepared by mixing 1150 deg. C-calcined BaTi{sub 4}O{sub 9} with 1150 deg. C-calcined Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3} powders. The crystal structure, microwave dielectric properties and sinterabilites of the (1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} ceramics have been investigated. X-ray diffraction patterns reveal that BaTi{sub 4}O{sub 9}, ordered and disordered Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3} phases exist independently over the whole compositional range. The sintering temperatures of (1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} ceramics are about 1240 - 1320 deg. C and obviously lower than those of Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3} ceramics. The dielectric constants ({epsilon}{sub r}) and the temperature coefficient of resonant frequency ({tau}{sub f}) of (1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} ceramics increase with the increase of BaTi{sub 4}O{sub 9} content. Nevertheless, the bulk densities and the quality values (Q x f) of (1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} ceramics increase with the increase of Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3} content. The results are attributed to the higher density and quality value of Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3} ceramics, the better grain growth, and the densification of sintered specimens added a small BaTi{sub 4}O{sub 9} content. The (1 - x)Ba(Zn{sub 1/3}Ta{sub 2/3})O{sub 3}-xBaTi{sub 4}O{sub 9} ceramic with x = 0.1 sintered at 1320 deg. C exhibits a {epsilon}{sub r} value of 31.5, a maximum Q x f value of 68500 GHz and a minimum {tau}{sub f} value of 4.1 ppm/deg. C.

• OSTI ID: 21062246
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
BULK DENSITY
CERAMICS
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
MICROSTRUCTURE
MICROWAVE RADIATION
OXIDES
PERMITTIVITY
SINTERING
TANTALUM COMPOUNDS
TEMPERATURE COEFFICIENT
TITANIUM COMPOUNDS
X-RAY DIFFRACTION
ZINC COMPOUNDS