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本文利用溶胶-凝胶法制备了名义成分为La2/3Sr1/3FexMn1-xO3（x=0.0，0.1，0.2，0.3，0.5）的系列样品. 样品先后经过773，873，1073 K热处理. 热处理时采用缓慢升温方式. X射线衍射分析表明，该系列样品均为单相钙钛矿结构，空间群为R3c. 利用 XPert HighScore Plus 软件计算了样品的晶粒尺寸、晶格常数、晶胞体积及键长、键角. 利用物理性能测量系统测量了样品的磁性，发现样品在10 K 的磁矩随掺杂量的增加而减小，但存在两个明显不同的变化区域：从x=0到x=0.2 时，平均每个分子的磁矩从2.72 B 迅速下降到0.33 B，居里温度从327 K下降到95 K，下降了232 K；而从x=0.2到x=0.5时，平均每个分子的磁矩从0.33 B 缓慢下降到0.05 B，居里温度从95 K 下降到46 K，只下降了49 K. 我们认为Fe与Mn 离子磁矩反平行是样品磁矩随Fe 掺杂量增加而下降的原因之一.Perovskite manganites with nominal composition La2/3Sr1/3FexMn1-xO3 (x=0, 0.1, 0.2, 0.3, 0.5) are prepared by the sol-gel method. The samples are treated three times at 773 K, 873 K and 1073 K, separately, in which processes the temperature is slowly increased. The X-ray diffraction patterns indicate that the samples have a single phase and perovskite structure each. The dimensions of the crystalline particles, lattice constants, cell volumes of the samples are calculated using the XPert HighScore Plus software. The magnetic properties are measured using a Quantum Design Physical Property Measurement System. The magnetic moments of the samples at 10 K decrease with the increase of Fe doping level x. The decreasing process can be divided to two ranges: one is from x=0 to x=0.2, in which range the average magnetic moment per formula decreases rapidly from 2.72 B to 0.33 B, while the Curie temperature decreases rapidly from 327 K to 95 K, i.e., it is reduced by 232 K; the other is from x=0.2 to x=0.5, in which range, however, the average magnetic moment per formula decreases slowly from 0.33 B to 0.05 B, while the Curie temperature decreases slowly from 95 K to 46 K, i.e., it is reduced only by 49 K. The experimental result that the magnetic moments of the samples decrease with the increase of Fe doping level may be explained as the fact that the magnetic moment direction of the Fe cations is opposite to those of Mn cations.
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Keywords:
- perovskite manganite /
- nonmetallic ferromagnetic materials /
- sol-gel processing /
- magnetic pro-perties
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[55] -
[1] Kusters R M, Singleton J, Keen D A, McGreevy R, Hayes W 1989 Physica B: Condens. Matter 155 362
[2] Chahara K, Ohno T, Kasai M, Kozono Y 1993 Appl. Phys. Lett. 63 1990
[3] [4] [5] Ju H L, Kwon C, Li Q, Greene R L, Venkatesan T 1994 Appl. Phys. Lett. 65 2108
[6] Salamon M B, Jaime M 2001 Rev. Mod. Phys. 73 583
[7] [8] [9] Xie Y W, Wang D J, Shen B G, Sun J R 2007 Chin. Phys. 16 3120
[10] [11] Feng J F, Zhao K, Huang Y H, Zhao J G, Han X F, Zhan W S, Wong H K 2005 Chin. Phys. 14 1879
[12] [13] Lu Y, Li Q A, Di N L, Li R W, Ma X, Kou Z Q, Cheng Z H 2003 Chin. Phys. 12 1301
[14] [15] Tao Y M, Lin L, Dong S, Liu J M 2012 Chin. Phys. B 21 107502
[16] [17] Zhang N, Ding W P, Tan X L, Xu Y L, Xing D Y, Du Y W 1998 Chin. Phys. 7 361
[18] [19] Hu L, Sun Y P, Wang B, Luo X, Sheng Z G, Zhu X B, Song W H, Yang Z R, Dai J M 2010 Chin. Phys. Lett. 27 097504
[20] [21] Xu G J, Tan W S, Cao H, Deng K M, Wu X S 2009 Acta Phys. Sin. 58 378 (in Chinese) [徐跟建, 谭伟石, 曹辉, 邓开明, 吴小山 2009 58 378]
[22] [23] Liu N, Yan G Q, Zhu G, Guo H Y 2012 Rare Metals 31 135
[24] [25] Zhao H Y, Yang H, Ma J Y, Fang X, Kamran M, Dai Y M, Li M, Zhao B R, Qiu X G 2008 Acta Phys. Sin. 57 7168 (in Chinese) [赵华英, 杨欢, 马继云, 方煦, Kamran M, 戴耀民, 李 明, 赵柏儒, 邱祥冈 2008 57 7168]
[26] Tang G D, Hou D L, Chen W, Zhao X, Qi W H 2007 Appl. Phys. Lett. 90 144101
[27] [28] [29] Tang G D, Hou D L, Chen W, Hao P, Liu G H, Liu S P, Zhang X L, Xu L Q 2007 Appl. Phys. Lett. 91 152503
[30] Li Y F, Ji D H, Zhao Z W, Tang G D, Liu S P, Zhang Y G, Li Z Z, Yao Y X, Hou D L, Zhu M G 2011 Rare Metals 30 232
[31] [32] [33] Li Y F, Ji D H, Liu S P, Tang G D, Li Z Z, Yao Y X, Hou D L, Zhu M G 2012 Rare Metals 31 379
[34] Jiang K, Gong S K 2009 Chin. Phys. B 18 3035
[35] [36] Sun Y, Tong W, Xu X J, Zhang Y H 2001 Appl. Phys. Lett. 78 643
[37] [38] [39] Joshi L, Keshri S 2011 Measurement 44 938
[40] Blanco J J, Insausti M, Muro I Gil de, Lezama L, Rojo T 2006 J. Solid. State. Chem. 179 623
[41] [42] [43] Rietveld H M 1969 J. Appl. Cryst. 2 65
[44] Phillips J C 1970 Rev. Mod. Phys. 42 317
[45] [46] Ji D H, Tang G D, Li Z Z, Hou X, Han Q J, Qi W H, Liu S R, Bian R R 2013 J. Magn. Magn. Mater. 326 197
[47] [48] [49] Shannon R D 1976 Acta Cryst. A 32 751
[50] 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
[51] [52] 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)]
[53] [54] Chen C W 1977 Magnetism and Metallurgy of Soft Magnetic Materials (New York: North-Holland Publishing Company) p171
[55]
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