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Enhancement of saturation magnetization and remenance of ${\rm{BaFe_{12}O_{19}}}$ materials prepared by NaCl-KCl and Hexamine as flux
IEEE Magnetics Letters ( IF 1.1 ) Pub Date : 2020-01-01 , DOI: 10.1109/lmag.2020.2965889
Shereen Selvaraj , Uma Gandhi , Umapathy Mangalanathan , L. John Berchmans

Hexagonal platelet barium ferrite was produced through a two-step molten salt synthesis calcined at 850 °C for 5 h with NaCl–KCl as flux, followed by calcination at 400 °C for 5 h with hexamine. Influence of NaCl–KCl and hexamine on the structural, phase composition, surface morphology, and magnetic properties of BaFe12O19 was studied by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric/differential analysis, scanning electron microscopy, and a superconducting quantum interference device. The particles exhibited M-type barium hexaferrite nanoparticles with a product yield of 97.8% with a mean crystallite size of 81 nm for NaCl–KCl and 50 nm for hexamine. The infrared spectrum showed tetrahedral and octahedral positions in the absorption bands of hexagonal ferrite. As the atomic ratio of Ba:Fe:O is found to be 1:12.3:17.6, which is close to the stoichiometric ratio of BaFe12O19, it confirms the hexagonal structure of the sample. The plates are found to agglomerate, and variation in particle size was observed using scanning electron microscopy. The samples revealed better magnetic properties with a high saturation magnetization of 165.3 emu/g, higher remanence of 58 emu/g, coercivity of 929 Oe, and a squareness ratio of 0.35. This investigation was performed to examine the microstructure and the effect of crystallinity of the submicrometer BaFe12O19 powders on magnetic properties. This study also provides a promising method and total processing parameters to synthesize hard ferrite powders with improved hard magnetic properties and fine crystallite size.

中文翻译:

以NaCl-KCl和六胺为助熔剂制备${\rm{BaFe_{12}O_{19}}}$材料的饱和磁化强度和剩磁增强

六方片晶铁酸钡是通过两步熔盐合成制备的,在 850°C 下用 NaCl-KCl 作为助熔剂煅烧 5 小时,然后用六胺在 400°C 下煅烧 5 小时。通过 X 射线衍射、傅里叶变换红外光谱、热重/微分分析、扫描电子显微镜和超导量子干涉装置研究了 NaCl-KCl 和六胺对 BaFe12O19 的结构、相组成、表面形貌和磁性能的影响. 颗粒表现出 M 型六铁酸钡纳米颗粒,产品产率为 97.8%,NaCl-KCl 的平均晶粒尺寸为 81 nm,六胺的平均晶粒尺寸为 50 nm。红外光谱显示六方铁氧体吸收带中的四面体和八面体位置。由于发现 Ba:Fe:O 的原子比为 1:12.3:17。图 6 接近于 BaFe12O19 的化学计量比,证实了样品的六方结构。发现板结块,并使用扫描电子显微镜观察颗粒大小的变化。样品显示出更好的磁性能,具有 165.3 emu/g 的高饱和磁化强度、58 emu/g 的较高剩磁、929 Oe 的矫顽力和 0.35 的矩形比。进行这项研究是为了检查亚微米 BaFe12O19 粉末的微观结构和结晶度对磁性能的影响。该研究还提供了一种有前景的方法和总工艺参数来合成具有改进的硬磁性能和细晶粒尺寸的硬铁氧体粉末。发现板结块,并使用扫描电子显微镜观察颗粒大小的变化。样品显示出更好的磁性能,具有 165.3 emu/g 的高饱和磁化强度、58 emu/g 的较高剩磁、929 Oe 的矫顽力和 0.35 的矩形比。进行这项研究是为了检查亚微米 BaFe12O19 粉末的微观结构和结晶度对磁性能的影响。该研究还提供了一种有前景的方法和总工艺参数来合成具有改进的硬磁性能和细晶粒尺寸的硬铁氧体粉末。发现板结块,并且使用扫描电子显微镜观察颗粒尺寸的变化。样品显示出更好的磁性能,具有 165.3 emu/g 的高饱和磁化强度、58 emu/g 的较高剩磁、929 Oe 的矫顽力和 0.35 的矩形比。进行这项研究是为了检查亚微米 BaFe12O19 粉末的微观结构和结晶度对磁性能的影响。该研究还提供了一种有前景的方法和总工艺参数来合成具有改进的硬磁性能和细晶粒尺寸的硬铁氧体粉末。较高的剩磁为 58 emu/g,矫顽力为 929 Oe,矩形比为 0.35。进行这项研究是为了检查亚微米 BaFe12O19 粉末的微观结构和结晶度对磁性能的影响。该研究还提供了一种有前景的方法和总工艺参数来合成具有改进的硬磁性能和细晶粒尺寸的硬铁氧体粉末。较高的剩磁为 58 emu/g,矫顽力为 929 Oe,矩形比为 0.35。进行这项研究是为了检查亚微米 BaFe12O19 粉末的微观结构和结晶度对磁性能的影响。该研究还提供了一种有前景的方法和总工艺参数来合成具有改进的硬磁性能和细晶粒尺寸的硬铁氧体粉末。
更新日期:2020-01-01
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