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六方钡铁氧体颗粒的伪超顺磁性行为。

Pseudo-superparamagnetic behaviour of barium hexaferrite particles.

作者信息

Dudziak Szymon, Ryżyńska Zuzanna, Bielan Zuzanna, Ryl Jacek, Klimczuk Tomasz, Zielińska-Jurek Anna

机构信息

Department of Process Engineering and Chemical Technology, Gdansk University of Technology G. Narutowicza 11/12 80-233 Gdansk Poland

Faculty of Applied Physics and Mathematics and Advanced Materials Centre, Gdansk University of Technology Narutowicza 11/12 80-233 Gdansk Poland.

出版信息

RSC Adv. 2020 May 18;10(32):18784-18796. doi: 10.1039/d0ra01619e. eCollection 2020 May 14.

DOI:10.1039/d0ra01619e
PMID:35518324
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9053871/
Abstract

The effect of hexadecyltrimethylammonium bromide (CTAB) addition on the crystal structure, morphology, and magnetic properties of co-precipitated hexagonal barium ferrite was investigated. For a fixed amount of surfactant, different Fe concentrations and Fe/Ba ratios were used to optimize the formation of single-phase barium ferrite particles. The results indicated that the obtained ferrite particles exhibited coercivity changes similar to those of superparamagnetic particles with larger than theoretically calculated particle sizes. This results from the softening of the material due to the size reduction of the grains and incorporation of excess barium, localized on the surface of the particles. Therefore, lowering the energy barrier required to reverse the magnetization was observed, while high magnetization saturation was preserved. The precipitation of barium ferrite particles from a surfactant-rich solution allowed control of BaFeO magnetic properties without introducing any modifications inside the crystal structure.

摘要

研究了添加十六烷基三甲基溴化铵（CTAB）对共沉淀六方钡铁氧体晶体结构、形貌和磁性的影响。对于固定量的表面活性剂，使用不同的铁浓度和铁/钡比来优化单相钡铁氧体颗粒的形成。结果表明，所获得的铁氧体颗粒表现出与理论计算粒径更大的超顺磁性颗粒相似的矫顽力变化。这是由于颗粒尺寸减小以及过量钡（位于颗粒表面）的掺入导致材料软化所致。因此，观察到反转磁化所需的能垒降低，同时保持了高磁化饱和度。从富含表面活性剂的溶液中沉淀钡铁氧体颗粒，可以在不改变晶体结构内部任何特性的情况下控制钡铁氧体的磁性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/1f5401a4cdf5/d0ra01619e-f13.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/1f5401a4cdf5/d0ra01619e-f13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/630ee56fd75d/d0ra01619e-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/390b3e44863c/d0ra01619e-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/901f72752602/d0ra01619e-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/b676bde07a12/d0ra01619e-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/0702291014fd/d0ra01619e-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/d0e751cc5b34/d0ra01619e-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/cfe7e142ddc7/d0ra01619e-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/04de6492b678/d0ra01619e-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/fcd681df971b/d0ra01619e-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/a006069213fe/d0ra01619e-f10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/2f3eeae773ee/d0ra01619e-f11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/3b0b5a23238c/d0ra01619e-f12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/460f/9053871/1f5401a4cdf5/d0ra01619e-f13.jpg

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