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Synthesis of Nanocrystalline SrFe 12 O 19 Particles Doped with SrTiO 3 via Combustion Synthesis for Microwave Absorption Applications
Author(s) -
Chang ChingChih,
Chen YiChuan,
Wang GawPying,
Hwang ChyiChing,
Yeh CyuanCing
Publication year - 2010
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201000136
Subject(s) - nanocrystalline material , microwave , calcination , chemistry , absorption (acoustics) , combustion , permittivity , doping , analytical chemistry (journal) , dielectric , materials science , optoelectronics , crystallography , organic chemistry , composite material , physics , quantum mechanics , catalysis
Abstract Nanocrystalline hard magnetic SrFe 12 O 19 (Sr‐M) particles incorporated with high dielectric constant SrTiO 3 (STO, up to 15 mol%), which are being investigated as potential materials for microwave absorption, were synthesized simultaneously in one step through a combustion reaction using nitrates and glycine as raw materials. The desired products simply composed of Sr‐M and STO can be obtained after calcination of the as‐burned nanoparticles products at 900 °C for 1 h. The effects of the STO content on the relative complex permittivity (ϵ r = ϵ′ − j ϵ″), permeability (μ r = μ′ − j μ″) and the behavior of microwave absorption in the frequency range of 1 MHz − 1.8 GHz have been investigated. Adding more STO to Sr‐M was demonstrated not only to improve ϵ r but also to modify μ r . In addition, it was found that the sintered specimens showed a characteristic of broad‐band absorption, and their absorbing efficiencies were enhanced with increasing STO content.