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Indexed by:期刊论文

Date of Publication:2009-05-05

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:475

Issue:1-2

Page Number:862-868

ISSN No.:0925-8388

Key Words:Flake-shaped barium titanate; Electromagnetic characteristics; Reflection loss

Abstract: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 degrees C/paraffin composite samples with thickness of 1 mm and FBT (annealing at 1000 degrees C)/paraffin composite samples with different thickness from I 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 degrees C)/paraffin composite sample reached -29.6 dB at 12 GHz with a matching thickness of 4 mm. (C) 2008 Elsevier B.V. All rights reserved.