The effect of pH values on the phase formation and properties of BaFe12O19 prepared by citrate–EDTA complexing method
The effect of pH values on the phase formation and properties of BaFe12O19 prepared by citrate–EDTA complexing method
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DOI：
10.1016/j.jallcom.2006.12.118
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发表时间：
2008-04
影响因子：
6.2
通讯作者：
Lixi Wang;Qitu Zhang
中科院分区：
文献类型：
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作者：
Lixi Wang;Qitu Zhang
采用柠檬酸盐-EDTA络合法，以柠檬酸盐和EDTA为络合剂，在不同pH值下制备了BaFe_（12）O_（19）铁氧体。络合稳定常数分析、XRD图谱和SEM研究均表明，在pH 6的条件下，金属离子与配体的螯合作用可达到最佳程度。前驱体中Fe 3+和Ba 2+的分布越均匀，则前驱体越容易完全转变为六方钡铁氧体。利用网络分析仪（Agilent 8722 ET），采用反射/透射技术，在2- 18 GHz的频率范围内，测量了样品的电磁参数. pH值为6的样品具有最低的介电常数（μ ′=1-3，μ ″ = 0.5 - 2.5）和最高的磁导率（μ′=1.5-3.5，μ″=0.5-2.5），表现出优异的微波性能。
Barium hexaferrites (BaFe12O19) have been prepared by citrate–EDTA complexing method using citrate and EDTA as complexing chelating agents with various pH values. Complexation stability constant analysis, XRD patterns and SEM investigations all display that the chelation between metallic ions and ligand may reach an excellent degree in the condition of pH 6. The precursor with more uniformly distributed Fe3+and Ba2+can convert to hexagonal barium ferrite more easily and completely. A network analyzer (Agilent 8722ET) was employed to determine the electromagnetic parameters of ɛ′, ɛ″, μ′, and μ″ at the frequency range of 2–18GHz by a reflection/transmission technique. The sample of pH 6 has lowest permittivity (ɛ′=1–3, ɛ″≈0) and highest permeability (μ′=1.5–3.5, μ″=0.5–2.5), exhibiting excellent microwave performances.