采用共沉淀法按照n(Fe)∶n(Sr)=10∶1合成M型锶铁氧体.通过把样品在不同的温度下退火,研究了退火温度对晶体结构、形貌和磁性能的影响.所制备的样品用FTIR、XRD、SEM和VSM进行表征.结果表明,当退火温度为1000℃时样品颗粒分布规则且比饱和磁化强度达最大值,为77.87emu/g.当退火温度为1100℃时样品颗粒变成球形且矫顽力最小,为1601Oe.此外,通过控制退火温度可使矫顽力在1601～4591Oe范围内变化.
M-type Sr-ferrite powder with Fea+ to Sr2+ of 10 ∶ 1 mole ratio was synthesized by the chemical coprecipitation-calcination route.The samples were sintered at different temperatures from 800℃ to 1100℃ in order to investigate the effects of sintering temperature on the crystal structure,grain size,morphology and magnetic proper ties.The powders were characterized by infrared spectra,powder X-rays diffraction,scanning electron microscopy and vibrating sample magnetometer.Powders sintered at 1000℃ show the best homogeneity in terms of size and morphology,and possess the highest saturation magnetization of 77.87emu/g.Powders sintered at 1100℃ have a spherical shape and show the lowest coercivity of 1601Oe.The results also show that a wide range of coercivity varying from 1601Oe to 4591Oe could be obtained by selecting the appropriate calcination temperature.
参考文献
| [1] | Iqbal MJ;Ashiq MN;Hernandez-Gomez P;Munoz JM .Synthesis, physical, magnetic and electrical properties of Al-Ga substituted co-precipitated nanocrystalline strontium hexaferrite[J].Journal of Magnetism and Magnetic Materials,2008(6):881-886. |
| [2] | Fu Y P et al.Strontium hexaferrite powders prepared by a microwave-induced combustion process and some of their properties[J].Journal of Alloys and Compounds,2003,349(1-2):228. |
| [3] | Shirk B T .Ba2Fe6O11:A new metastable compound[J].Materials Research Bulletin,1970,5(10):771. |
| [4] | Kojima H.Chapter 5 Fundamental properties of hexagonal ferrites with magnetoplumbite structure[J].Handbook Ferromagnetic Mater,1982(03):305. |
| [5] | Amighian, J;Mozaffari, M;Arab, A;Yousefi, MH .The effect of La-substitution on magnetic properties of nanosized Sr1-xLaxTi0.05Zn0.2(Fe3+)(11.75-delta)(Fe2+)(delta)O-19 powders[J].Journal of Magnetism and Magnetic Materials,2010(6):748-752. |
| [6] | Kools F.;Morel A.;Grossinger R.;Le Breton JM.;Tenaud P. .LaCo-substituted ferrite magnets, a new class of high-grade ceramic magnets; intrinsic and microstructural aspects[J].Journal of Magnetism and Magnetic Materials,2002(2):1270-1276. |
| [7] | Seifert, D;Topfer, J;Langenhorst, F;Le Breton, JM;Chiron, H;Lechevallier, L .Synthesis and magnetic properties of La-substituted M-type Sr hexaferrites[J].Journal of Magnetism and Magnetic Materials,2009(24):4045-4051. |
| [8] | Hessien MM;Rashad MM;El-Barawy K .Controlling the composition and magnetic properties of strontium hexaferrite synthesized by co-precipitation method[J].Journal of Magnetism and Magnetic Materials,2008(3/4):336-343. |
| [9] | Xiansong Liu;Wei Zhong;Benxi Gu;Youwei Du .Exchange-coupling interaction in nanocomposite SrFe_(12)O_(19)/γ-Fe_(2)O_(3) permanent ferrites[J].Journal of Applied Physics,2002(2):1028-1032. |
| [10] | Ataie A;Heshmati-Manesh S .Synthesis of ultra-fine particles of strontium hexaferrite by a modified co-precipitation method[J].Journal of the European Ceramic Society,2001,21(10-11):1951. |
| [11] | Zi ZF;Sun YP;Zhu XB;Yang ZR;Dai JM;Song WH .Structural and magnetic properties of SrFe12O19 hexaferrite synthesized by a modified chemical co-precipitation method[J].Journal of Magnetism and Magnetic Materials,2008(21):2746-2751. |
| [12] | Wang, YF;Li, QL;Zhang, CR;Li, BD .Effect of Fe/Sr mole ratios on the formation and magnetic properties of SrFe12O19 microtubules prepared by sol-gel method[J].Journal of Magnetism and Magnetic Materials,2009(19):3368-3372. |
| [13] | Jean M;Nachbaur V;Bran J et al.Synthesis and characterization of SrFe12 O19 powder obtained by hydrothermal process[J].Journal of Alloys and Compounds,2010,496(1-2):306. |
| [14] | Ding J.;McCormick PG.;Street R.;Miao WF. .High-coercivity ferrite magnets prepared by mechanical alloying[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(1):32-36. |
| [15] | Guo ZB.;Zhong W.;Zhang JR.;Du YW.;Ding WP. .PREPARATION AND MAGNETIC PROPERTIES OF SRFE12O19 PARTICLES PREPARED BY THE SALT-MELT METHOD[J].Journal of Magnetism and Magnetic Materials,1997(3):333-336. |
| [16] | Nikkhah-Moshaie R;Ataie A;Seyyed Ebrahimi S A .Processing of nano-structured barium hexaferrite by self-propagating high temperature synthesis (SHS) using nitrate precursor[J].Journal of Alloys and Compounds,2007,429(1-2):324. |
| [17] | Jiang J et al.Multifunctional polypyrrole/strontium hexaferrite composite microspheres:Preparation,characterization,and properties[J].Journal of Physical Chemistry B,2009,113(05):1376. |
| [18] | Hasaba M G et al.Comparison of the effects of cationic,anionic and nonionic surfactants on the properties of Srhexaferrite nanopowders ynthesized by a sol-gel auto-combustion method[J].Journal of Magnetism and Magnetic Materials,2007,316(02):13. |
| [19] | Yang X F et al.Preparation and magnetic properties of controllable-morphologies nano-SrFe12 O19 particles prepared by sol-gel self propagation synthesis[J].Journal of Alloys and Compounds,2009,475(1-2):312. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%