Submicron Barium Hexaferrite Ceramics Manufactured by Low-Temperature Liquid-Phase Sintering of BaFe12O19 Nanoparticles

IF 1.8 3区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
A. Yu. Mironovich, V. G. Kostishin, H. I. Al-Khafaji, A. V. Timofeev, E. S. Savchenko, A. I. Ril
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Abstract

This work has solved the problem of manufacturing high-coercivity barium hexaferrite BaFe12O19 ceramic samples. A BaFe12O19 nanopowder with coercivity Hc = 445 kA/m was prepared by hydrothermal synthesis. Sintering was carried out at low temperature (900°C) to preserve the grains in a single-domain state. To perform sintering at such a low temperature, B2O3 or Bi2O3 was added to the hexaferrite. The effects of the amount and type of additive on the phase composition, microstructure, and magnetic properties of the sintered hexaferrite were studied. When Bi2O3 (in the form of 0.5, 1, or 3 wt % of Bi(NO3)3) was used, no changes in the phase composition occurred, while addition of B2O3 (in the form of 0.5, 1, or 3 wt % of H3BO3) resulted in a partial transformation of the hexaferrite to hematite α-Fe2O3. The average grain size of BaFe12O19 increased in response to increasing Bi2O3 or B2O3 concentration, but did not exceed the critical single-domain size. This provided for the high Hc values (370–420 kA/m) of the sintered samples, making them superior to most well-known brands of unsubstituted hexaferrites.

Abstract Image

BaFe12O19纳米颗粒低温液相烧结制备亚微米六铁体钡陶瓷
本工作解决了高矫顽力钡六铁体BaFe12O19陶瓷样品的制备问题。采用水热合成法制备了矫顽力Hc = 445 kA/m的BaFe12O19纳米粉体。在低温(900℃)下烧结,使晶粒保持在单畴状态。为了在如此低的温度下进行烧结,在六铁体中加入B2O3或Bi2O3。研究了添加剂的添加量和种类对烧结六铁素体的相组成、显微组织和磁性能的影响。当使用Bi2O3(以0.5、1或3wt %的Bi(NO3)3的形式)时,相组成没有变化,而添加B2O3(以0.5、1或3wt %的H3BO3的形式)导致六铁素体部分转变为赤铁矿α-Fe2O3。BaFe12O19的平均晶粒尺寸随着Bi2O3或B2O3浓度的增加而增大,但未超过临界单畴尺寸。这为烧结样品提供了高Hc值(370-420 kA/m),使其优于大多数知名品牌的未取代六铁素体。
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来源期刊
Russian Journal of Inorganic Chemistry
Russian Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
3.10
自引率
38.10%
发文量
237
审稿时长
3 months
期刊介绍: Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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