尖晶石铁氧体TixNi1-xFe2O4中阳离子分布和Ti离子磁矩的实验研究

徐静; 齐伟华; 纪登辉; 李壮志; 唐贵德; 张晓云; 尚志丰; 朗莉莉

doi:10.7498/aps.64.017501

摘要

采用固相反应法制备了系列样品TixNi1-xFe2O4 (x=0.0, 0.1, 0.2, 0.3, 0.4). 室温下的X射线衍射谱表明样品全部为(A)[B]2O4型单相立方尖晶石结构, 属于空间群Fd3m. 样品的晶格常数随Ti掺杂量的增加而增大. 样品在10 K温度下的比饱和磁化强度σS随着Ti掺杂量x的增加逐渐减小. 研究发现, 当Ti掺杂量x≥ 0.2时, 磁化强度σ随温度T的变化曲线出现两个转变温度TL和TN. 当温度低于TN时, 磁化强度明显减小; 当温度达到TN时, dσ/dT具有最大值. σ-T曲线的这些特征表明, 由于Ti掺杂在样品中出现了附加的反铁磁结构. 这说明样品中的Ti离子不是无磁性的+4价离子, 而是以+2和+3价态存在, 其离子磁矩的方向与Fe和Ni离子的磁矩方向相反. 利用本课题组提出的量子力学方势垒模型拟合样品在10 K温度下的磁矩, 得到了Ti, Fe和Ni三种阳离子在(A)位和[B]位的分布情况, 并发现在所有掺杂样品中, 80%的Ti离子以+2价态占据尖晶石结构的[B]位.

关键词:

Abstract

Spinel ferrite samples TixNi1-xFe2O4 (x=0, 0.1, 0.2, 0.3, 0.4) were prepared using conventional solid reaction method. The sample exhibit a single-phase cubic spinel structure with a space group obtained Fd3m. The lattice parameter a increases with the increase of Ti doping level x. But the specific saturation magnetizations, σs, gradually decrease with increasing Ti doping level x at 10 K and 300 K. It is interesting that when the doping level x≥0.2, two transition temperatures, TL and TN, are found: when the temperature is lower than TN, the magnetization is obviously decreased, while at the temperature TL, dσ/d T reaches a maximum value. This phenomenon indicates that an additional antiferromagnetic structure arises in the traditional spinel phase of ferrites which results from Ti doping, that Ti ions will show the form of Ti3+ and Ti2+ cations which have magnetic moments, and that the magnetic moments of the Ti cations are opposite to those of the Fe and Ni cations. The dependence of the magnetic moments of the samples on the Ti doping level x at 10 K was fitted successfully using the quantum-mechanical potential barrier model proposed earlier by our group. In the fitting process, the distributions of Ti, Ni and Fe cations in the samples are obtained. It is found that 80% of the Ti cations will occupy the [B] sites in Ti2+ form.

Keywords:

作者及机构信息

1.
河北省新型薄膜材料实验室, 河北师范大学物理科学与信息工程学院, 石家庄 050024;

2.
河北工程大学理学院, 邯郸 056038;

3.
六盘水师范学院物理与电子科学系, 六盘水 553004

基金项目: 国家自然科学基金(批准号: 11174069)和河北省教育厅青年基金(批准号:QN20131008)资助的课题.

Authors and contacts

1.
Hebei Advanced Thin Film Laboratory, Department of Physics, Hebei Normal University, Shijiazhuang 050024, China;

2.
School of Science, Hebei University of Engineering, Handan 050038, China;

3.
Department of Physics and Electronic Science, Liupanshui Normal University, Liupanshui 553004, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11174069), and the Young scholar Science Foundation of the Education Department of Hebei Province, China (Grant No. QN20131008).

参考文献

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[18]	Liu S R, Ji D H, Xu J, Li Z Z, Tang G D, Bian R R, Qi W H, Shang Z F, Zhang X Y 2013 J. Alloy. Compd. 581 616
[19]	Tang G D, Han Q J, Xu J, Ji D H, Qi W H, Li Z Z, Shang Z F, Zhang X Y 2014 Physica B 438 91
[20]	Zhang X Y, Xu J, Li Z Z, Qi W H, Tang G D, Shang Z F, Ji D H, Lang L L 2014 Physica B 446 92
[21]	Shang Z F, Qi W H, Ji D H, Xu J, Tang G D, Zhang X Y, Li Z Z, Lang L L 2014 Chin. Phys. B 23 107503
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施引文献

[1]	Silwal P, Miao L, Stern I, Zhou X, Hu J, Kim D H 2012 Appl. Phys. Lett. 100 032102
[2]	Fritsch D, Ederer C 2011 Appl. Phys. Lett. 99 081916
[3]	Zhang R C, Liu L, Xu X L 2011 Chin. Phys. B 20 086101
[4]	Wang W J, Zang C G, Jiao Q J 2013 Chin. Phys. B 22 128101
[5]	Zhou X, Hou Z L, Li Feng, Qi Xin 2010 Chin. Phys. Lett. 27 117501
[6]	Huang Y L, Hou Y H, Zhao Y J, Liu Z W, Zeng D C, Ma S C 2013 Acta Phys. Sin. 62 167502 (in Chinese) [黄有林, 侯育花, 赵宇军, 刘仲武, 曾德长, 马胜灿 2013 物理学报 62 167502]
[7]	Bai Y, Ding L H, Zhang W F 2011 Acta Phys. Sin. 60 058201 (in Chinese) [白莹, 丁玲红, 张伟风 2011 物理学报 60 058201]
[8]	Lei J M, L L, Liu L, Xu X L 2011 Acta Phys. Sin. 60 017501 (in Chinese) [雷洁梅, 吕柳, 刘玲, 许小亮 2011 物理学报 60 017501]
[9]	Kale C M, Bardapurkar P P, Shukla S J, Jadhav K M 2013 J. Magn. Magn. Mater. 331 220
[10]	Chand Prem, Srivastava Ramesh C, Upadhyay Anuj 2008 J. Alloy. Compd. 460 108
[11]	Srivastava R C, Khan D C, Das A R 1990 Physical Review B 41 12514
[12]	Heinrich H, Christian K, Ernst B 1996 J. Solid State Chem. 125 216
[13]	Tang G D, Hou D L, Chen W, Zhao X, Qi W H 2007 Appl. Phys. Lett. 90 144101
[14]	Tang G D, Ji D H, Yao Y X, Liu S P, Li Z Z, Qi W H, Han Q J, Hou X, Hou D L 2011 Appl. Phys. Lett. 98 072511
[15]	Phillips J C 1970 Rev. Mod. Phys. 42 317
[16]	Ji D H, Tang G D, Li Z Z, Hou X, Han Q J, Qi W H, Bian R R, Liu S R 2013 J. Magn. Magn. Mater. 326 197
[17]	Ji D H 2013 PH. D. dissertations (Shijiazhuang: Hebei Normal University) (In Chinese) [纪登辉2013博士学位论文(石家庄: 河北师范大学)]
[18]	Liu S R, Ji D H, Xu J, Li Z Z, Tang G D, Bian R R, Qi W H, Shang Z F, Zhang X Y 2013 J. Alloy. Compd. 581 616
[19]	Tang G D, Han Q J, Xu J, Ji D H, Qi W H, Li Z Z, Shang Z F, Zhang X Y 2014 Physica B 438 91
[20]	Zhang X Y, Xu J, Li Z Z, Qi W H, Tang G D, Shang Z F, Ji D H, Lang L L 2014 Physica B 446 92
[21]	Shang Z F, Qi W H, Ji D H, Xu J, Tang G D, Zhang X Y, Li Z Z, Lang L L 2014 Chin. Phys. B 23 107503
[22]	Soshin Chikazumi 1997 Physics of Ferromagnetism 2e (Oxford University Press) p111
[23]	Chen C W 1977 Magnetism and Metallurgy of soft magnetic materials, North-Holland Publishing Company
[24]	Dai D S, Qian K M 2000 Ferromagnetics (Science Press) p144 [戴道生, 钱昆明 2000 铁磁学 (科学出版社) 第144页]
[25]	Shannon R D 1976 Acta Cryst. A 32 751
[26]	Rietveld H M 1969 J. Appl. Cryst. 2 65

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