A novel microwave dielectric ceramic Ca{sub 2}Zn{sub 4}Ti{sub 16}O{sub 38}: Preparation and dielectric properties

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.03.007· OSTI ID:20905303

Fei, Zhao ^[1]; Zhenxing, Yue ^[1]; Jing, Pei ^[1]; Zhilun, Gui ^[1]; Longtu, Li ^[1]

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1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084 (China)

A novel microwave dielectric powder with composition of Ca{sub 2}Zn{sub 4}Ti{sub 16}O{sub 38} was synthesized through a citrate sol-gel process. The development of crystalline phases with heat-treating temperature for the gel derived powders was evaluated by using thermo-gravimetric analysis and X-ray powder diffraction analysis techniques. The pure phase of Ca{sub 2}Zn{sub 4}Ti{sub 16}O{sub 38} with crichtonite crystal structure was obtained at relatively low temperature of 1000 deg. C. The synthesized powder has high reactivity and the dense ceramics with single crystalline phase were obtained at low sintering temperature of 1100 deg. C. Impedance spectroscopy and microwave dielectric measurements on sintered samples showed the present compound to be a modest dielectric insulator with excellent dielectric properties of {epsilon} {sub r}{approx}47-49, Qf value {approx}27,800-31,600 GHz and {tau} {sub f}{approx}+45 to +50 ppm/deg. C. It shows comparable microwave dielectric properties to other moderate-permittivity microwave dielectrics, but much lower sintering temperature of 1100 deg. C. - Graphical abstract: XRD patterns for the Ca{sub 2}Zn{sub 4}Ti{sub 16}O{sub 38} precursor powders after calcining at: (a) 600 deg. C, (b) 700 deg. C, (c) 800 deg. C, (d) 900 deg. C, and (e) 1000 deg. C. Display Omitted.

• OSTI ID: 20905303
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM COMPOUNDS
CERAMICS
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
GHZ RANGE
GRAVIMETRIC ANALYSIS
IMPEDANCE
MICROWAVE RADIATION
MONOCRYSTALS
OXIDES
PERMITTIVITY
SOL-GEL PROCESS
SPECTROSCOPY
TEMPERATURE RANGE 1000-4000 K
TITANIUM COMPOUNDS
X-RAY DIFFRACTION
ZINC COMPOUNDS