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采用固相反应法制备了SrMn0.5Fe0.5O3陶瓷样品，并对样品的晶体结构，磁性和离子价态进行了系统的表征与分析. X射线衍射谱的Rietveld拟合表明样品属于理想的立方钙钛矿型结构，Mn离子和Fe离子随机占据B位的O八面体中心. X射线光电子能谱表明Mn离子为+3和+4的混合原子价态，Fe离子为+3价. 样品在大于230K的高温区域呈现Curie顺磁特性，在小于230 K的低温区域样品表现出自旋玻璃态行为，这种特性源于Mn离子和Fe离子之间的交换作用及自身价态和分布的不均匀性. 由于Fe3+离子占据O八面体的中心，对顺磁区的Mssbauer谱测量表现为四级分裂.Polycrystalline perovskite SrMn0.5Fe0.5O3 has been synthesized by solid state reaction method. The crystal structure, magnetic properties and valence states of Mn and Fe ions have been investigated. X ray diffraction (XRD) and subsequent Rietveld refinement confirmed that SrMn0.5Fe0.5O3 is found to be a primitive cubic crystal structure，Mn and Fe atoms randomly occupy the center of oxygen octahedron. Also with the measure of XPS which indicates that Mn ions show trivalent and tetravalent state, while Fe ions are in trivalent state. Paramagnetic phase was observed in high temperature (>230 K), the spin-glass behavior at low temperature (3+ ions located in the octahedral sites.
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Keywords:
- crystal structure /
- valence /
- paramagnetic phase /
- spin-glass
[1] ［1］Tokura Y, Nagaosa N 2000 Science 288 462
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[15] ］Bi L, Taussig A R, Kim H S, Wang L, Dionne G F, Bono D, Persson K, Ceder G, Ross C A 2008 Phys. Rev. B 78 104106
[16] ］Deng J G, Zhang L, Dai H X, He H, Au C T 2009 J. Mol. Catal. A: Chem. 299 60
[17] ］Han W, Chang S Q, Dai Y D, Chen D, Huang Y J 2008 Acta Phys. Sin. 57 2493（in Chinese）［韩薇、常树全、戴耀东、陈达、黄彦君 2008 57 2493］
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[1] ［1］Tokura Y, Nagaosa N 2000 Science 288 462
[2] ［2］Dagotto E, Hotta T, Moreo A 2001 Phys Rep 344 1
[3] ［3］Zener C 1951 Phys Rev. 82 403
[4] ［4］Millis A J, Littlewood P B, Shraiman B I 1995 Phys. Rev. Lett. 74 5144
[5] ［5］Lu Y, Li Q A, Di N L, Cheng Z H 2003 Acta Phys. Sin. 52 1520 (in Chinese) ［鲁毅、李庆安、邸乃力、成昭华 2003 52 1520］
[6] ［6］Ueda K, Muraoka Y, Tabata H, Kawai T 2001 Appl. Phys. Lett. 78 512
[7] ［7］De K, Thakur M, Manna A, Giri S 2006 J. Appl. Phys. 99 013908
[8] ［8］Bhame S D, Joseph Joly V L, Joy P A 2005 Phys. Rev. B 72 054426
[9] ［9］Kolesnik S, Dabrowski B, Mais J, Brown D E, Feng R, Chmaissem O, Kruk R, Kimball C W 2003 Phys. Rev. B 67 144402
[10] ］Lee H J, Kim G, Kang J S, Dabrowski B, Han S W, Lee S S, Hwang C, Jung M C, Shin H J, Lee H G, Kim J Y, Min B I 2007 J. Appl. Phys. 101 09G523
[11] ］Kang J S, Lee H J, Kim G, Kim D H, Dabrowski B, Kolesnik S, Lee H, Kim J Y, Min B I 2008 Phys. Rev. B 78 054434
[12] ］Maignan A, Martin C, Damay F, Raveau B, Hejtmanek J 1998 Phys. Rev. B 58 2758
[13] ］Freitas R S, Ghivelder L, Damay F, Dias F, Cohen L F 2001 Phys. Rev. B 64 144404
[14] ］Han L A, Chen C L, Dong H Y, Wang J Y, Gao G M, Luo B C 2008 Acta Phys. Sin. 57 0541 (in Chinese) ［韩立安、陈长乐、董慧迎、王建元、高国棉、罗炳成 2008 57 0541］
[15] ］Bi L, Taussig A R, Kim H S, Wang L, Dionne G F, Bono D, Persson K, Ceder G, Ross C A 2008 Phys. Rev. B 78 104106
[16] ］Deng J G, Zhang L, Dai H X, He H, Au C T 2009 J. Mol. Catal. A: Chem. 299 60
[17] ］Han W, Chang S Q, Dai Y D, Chen D, Huang Y J 2008 Acta Phys. Sin. 57 2493（in Chinese）［韩薇、常树全、戴耀东、陈达、黄彦君 2008 57 2493］
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