Phase formation and microwave dielectric properties of Pb{sup 2+} and Sr{sup 2+} doped La{sub 4}Ti{sub 9}O{sub 24} ceramics

Journal Article · Thu Oct 12 04:00:00 EDT 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.03.011· OSTI ID:20891929

Liu, Y -W ^[1]; Pang, Lin ^[1]

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1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan (China)

Phase formation and microwave dielectric properties of the Pb{sup 2+} and Sr{sup 2+} doped La{sub 4}Ti{sub 9}O{sub 24} ceramics were investigated. Using electron diffraction and Rietveld analysis of the X-ray powder diffraction patterns, we show that the increase in the concentration of Pb{sup 2+} and Sr{sup 2+} doping results in the structural transition from La{sub 4}Ti{sub 9}O{sub 24} to a La{sub 2/3}TiO{sub 3}-type phase (Ibmm, No. 74). A change in the crystalline phase considerably affects the microwave dielectric properties, increasing the {epsilon} {sub r} from 37 to 130, reducing Q x f from 25,000 to 5500, and increasing temperature coefficient of the resonant frequency (TCF) from 15 to 300 ppm/deg. C.

• OSTI ID: 20891929
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 10 Vol. 41; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
DIELECTRIC PROPERTIES
DOPED MATERIALS
ELECTRON DIFFRACTION
LEAD IONS
MICROWAVE RADIATION
STRONTIUM IONS
SYNTHESIS
TEMPERATURE COEFFICIENT
X-RAY DIFFRACTION