Superparamagnetic Behavior in the Two Polymorphous Lithium Ferrite Nanoparticles

材料科学 超顺磁性 纳米晶材料 结构精修 透射电子显微镜 尖晶石 铁氧体(磁铁) 八面体 粒径 纳米颗粒 立方晶系 谢乐方程 粉末衍射 结晶学 化学工程 分析化学(期刊) 磁化 纳米技术 晶体结构 复合材料 冶金 化学 物理 色谱法 量子力学 磁场 工程类
作者
Y. Abbas,Ahmed Bakry,Ahmed H. Ibrahim
出处
期刊:American Journal of Materials Science 卷期号:4 (2): 84-96
摘要

The two polymorph modifications of LiFe5O8, fine particles were successfully prepared by ceramic technique at pre-sintering temperature of 500℃ and the pre-sintered material was crushed and sintered finally in the open air at 1000℃. The structural and microstructural evolutions of the nanophase were studied using powder X-ray diffraction (XRD) and the Rietveld method. The two polymorphous LiFe5O8 includes the ordered phase, termed α-LiFe5O8, with a primitive cubic unit cell (space group P4332, a=8.337 A) in which the Fe 3+ ions are at octahedral 12d and tetrahedral 8c sites, and Li + ions occupy only the octahedral 4b positions in the cubic primitive unit cell and disordered face centered cubic structure, termed β-LiFe5O8 (space group Fd-3m, a = 8.3333 A), The refinement of XRD results revealed the presence of mixed and nearly inverse spinel nanocrystalline Li-ferrite phases. Transmission electron microscopy (TEM) revealed that the particles of the prepared samples were spherical in shape, and were found to be ~20 nm in size, which increased up to ~ 60 nm on calcinations at 1000℃. TEM micrograph shows that the resultant nanospheres are solid like balls, the mechanism based on the lithium ferrite nanoparticles self-growth process is proposed in the formation of the nanospheres and TEM analysis confirmed the particle size obtained from X-ray results. Scherrer's equation was used to calculate the particle size of lithium ferrite from XRD data. Magnetic measurements were assessed using a vibrating sample magnetometer. Our results for the two polymorphs LiFe5O8 prepared samples show that the HC is very small and approaches zero compared to the applied field, the prepared samples for the two polymorphs exhibits no hysteresis, which may be attributed to superparamagnetic relaxation as confirmed by XRD.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
imlancelot发布了新的文献求助30
刚刚
lmd完成签到,获得积分10
刚刚
GY完成签到,获得积分10
刚刚
怕黑初阳完成签到,获得积分10
1秒前
Lx_wwww完成签到,获得积分10
1秒前
俊逸芸遥完成签到,获得积分10
1秒前
琳小依完成签到,获得积分10
1秒前
枯叶蝶发布了新的文献求助10
1秒前
2秒前
充电宝应助火火采纳,获得10
2秒前
陆个核桃发布了新的文献求助10
3秒前
贝涛发布了新的文献求助10
3秒前
情怀应助狂野雨灵采纳,获得10
3秒前
咸蛋黄巧克力完成签到,获得积分10
4秒前
4秒前
斯文谷秋发布了新的文献求助10
4秒前
好运滚滚来完成签到,获得积分10
5秒前
5秒前
万能图书馆应助非拉采纳,获得10
5秒前
yangohong完成签到,获得积分10
6秒前
6秒前
xiarifeng123应助傅双庆采纳,获得100
6秒前
汉堡包应助Qiuyajing采纳,获得10
6秒前
苏晓醒完成签到,获得积分10
6秒前
ShujunOvO发布了新的文献求助10
7秒前
火星上的冰蓝完成签到,获得积分10
7秒前
8秒前
科研通AI2S应助maow采纳,获得10
8秒前
9秒前
静夜谧思发布了新的文献求助10
9秒前
尚买办发布了新的文献求助10
9秒前
9秒前
爆米花应助Light采纳,获得10
9秒前
9秒前
9秒前
顾矜应助淡定树叶采纳,获得10
10秒前
Ll完成签到 ,获得积分10
11秒前
小心科研发布了新的文献求助10
11秒前
12秒前
852应助zimu012采纳,获得30
12秒前
高分求助中
Sustainability in Tides Chemistry 2000
Microlepidoptera Palaearctica, Volumes 1 and 3 - 13 (12-Volume Set) [German] 1122
Дружба 友好报 (1957-1958) 1000
The Data Economy: Tools and Applications 1000
Mantiden - Faszinierende Lauerjäger – Buch gebraucht kaufen 600
PraxisRatgeber Mantiden., faszinierende Lauerjäger. – Buch gebraucht kaufe 600
A Dissection Guide & Atlas to the Rabbit 600
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3105631
求助须知:如何正确求助?哪些是违规求助? 2756681
关于积分的说明 7641226
捐赠科研通 2410796
什么是DOI,文献DOI怎么找? 1279097
科研通“疑难数据库(出版商)”最低求助积分说明 617641
版权声明 599262