Synthesis and electromagnetic characteristics of the flake-shaped barium titanate powder

The flake-shaped barium titanate (FBT) was prepared by a modified sol–gel method, and their microstructure and electromagnetic (EM) properties (2–18 GHz) were investigated by means of differential thermal analysis (DTA), thermogravimetry analysis (TG), X-ray diffraction (XRD), scanning electronic mi...

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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 475; no. 1; pp. 862 - 868
Main Authors:	Jing, Lina, Wang, Guiqin, Duan, Yuping, Jiang, Yuzong
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 05-05-2009 Elsevier
Subjects:	Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures Cross-disciplinary physics: materials science; rheology Electromagnetic characteristics Exact sciences and technology Flake-shaped barium titanate Materials science Physics Reflection loss Treatment of materials and its effects on microstructure and properties Electromagnetic characteristics Reflection loss Flake-shaped barium titanate Wave absorption Temperature dependence Scanning electron microscopy Thermogravimetry Annealing temperature Differential thermal analysis Barium titanates XRD Permeability Thickness Scanning microscope Composite materials Size effect Microstructure Thermal annealing Complex permittivity Sol-gel process
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Summary:	The flake-shaped barium titanate (FBT) was prepared by a modified sol–gel method, and their microstructure and electromagnetic (EM) properties (2–18 GHz) were investigated by means of differential thermal analysis (DTA), thermogravimetry analysis (TG), X-ray diffraction (XRD), scanning electronic microscope (SEM) and a network analyser. The reflection loss R of FBT (annealing at different temperatures from 700 to 1200 °C)/paraffin composite samples with thickness of 1 mm and FBT (annealing at 1000 °C)/paraffin composite samples with different thickness from 1 to 5 mm were calculated in 2–18 GHz using the relative complex permittivity and permeability according to the transmit-line theory. It was found that the electromagnetic characteristics and the wave absorption properties of FBT were improved. The maximal reflection loss of FBT (annealing at 1000 °C)/paraffin composite sample reached −29.6 dB at 12 GHz with a matching thickness of 4 mm.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2008.08.038