文档介绍：Materials Chemistry and Physics 80 (2003) 129–134
Preparation and microwave properties of Co- and Ti-doped
barium ferrite by citrate sol–gel process
Zhang Haijun a,∗, Liu Zhichao b, Ma Chenliang a, Yao Xi c, Zhang Liangying c, Wu Mingzhong c
a High Temperature Ceramics Institute, Zhengzhou University, 75, Daxue Road, Zhengzhou 450052, Henan Province, PR China
b Department of Mechanical Engineering, Jiaozuo Institute of Technology, Jiaozuo 454159, Henan Province, PR China
c Functional Materials Research Laboratory, Tongji University, Shanghai 200092, PR China
Received 14 March 2002; received in revised form 3 August 2002; accepted 19 August 2002
Abstract
The citrate sol–gel synthesis method has been used to prepare Ba(CoTi)x Fe12−2x O19 (x varies from to in steps of ) hexaferrites.
Several methods such as X-ray diffractometry, scanning electron microscopy (SEM) work analyzer (HP8753E) have been used to
obtain detailed information on the crystallography and microwave properties of the precursor powders calcined at different temperature.
The correlations of Co2+Ti4+ substitution, annealing temperature and frequency plex permeability, permittivity, microwave
◦
absorption of Ba(CoTi)x Fe12−2x O19 ferrites have been studied. All the ferrites annealed at 1100 and 1200 C exhibit significant dispersion
plex permeability. The dispersion plex dielectric co