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Preparation and microwave properties of Co- and Ti-doped barium ferrite by citrate sol-gel process

机译:柠檬酸溶胶-凝胶法制备钴钛掺杂钡铁氧体及其微波性能

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The citrate sol-gel synthesis method has been used to prepare Ba(CoTi)(x)Fe12-2xO19 (x varies from 0.2 to 1.0 in steps of 0.2) hexaferrites. Several methods such as X-ray diffractometry, scanning electron microscopy (SEM) and network 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 with complex permeability, permittivity, microwave absorption of Ba(CoTi)(x)Fe12-2xO19 ferrites have been studied. All the ferrites annealed at 1100 and 1200 degreesC exhibit significant dispersion in complex permeability. The dispersion in complex dielectric constant is significant for the samples sintered at 1200 and 1100 degreesC. The variations of reflection loss have been studied as a function of frequency, Co2+Ti4+ content, and thickness of the absorber. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 23]
机译:柠檬酸溶胶-凝胶合成方法已用于制备Ba(CoTi)(x)Fe12-2xO19(x从0.2到1.0逐步变化,以0.2为步长)六方铁氧体。 X射线衍射,扫描电子显微镜(SEM)和网络分析仪(HP8753E)等几种方法已用于获得有关在不同温度下煅烧的前驱体粉末的晶体学和微波性质的详细信息。研究了Co(2),Ti(4)的取代,退火温度和频率与复磁导率,介电常数,Ba(CoTi)(x)Fe12-2xO19铁氧体的微波吸收之间的关系。在1100和1200℃退火的所有铁氧体都表现出明显的复磁导率分散。对于在1200和1100℃下烧结的样品,复介电常数的分散是显着的。已经研究了反射损耗随频率,Co2 + Ti4 +含量和吸收体厚度的变化。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:23]

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