Combined powder neutron and X-ray diffraction study of charge and orbital order in Bi0.75Sr0.25MnO3

被引：14
作者：
Goff, R. J.
Attfield, J. P.
机构：
[1] Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3JZ, Midlothian, Scotland
[2] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2006年 / 179卷 / 05期
关键词：
charge order; orbital order; manganite perovskites; X-ray diffraction; neutron diffraction;
D O I：
10.1016/j.jssc.2006.01.050
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The room temperature structure of Bi0.75Sr0.25MnO3 has been fitted to high-resolution synchrotron X-ray and time-of-flight neutron powder diffraction data. Constrained structural models were refined using a (1/2 00) Pn11 supercell (a = 11.0286(2) angstrom, b = 7.7351 (1) angstrom, c = 5.53419(9) angstrom, and alpha = 89.894( 1)degrees) of the underlying Pinna perovskite structure. The best-fit model evidences a 3:1 Mn3+/ Mn4+ charge ordering with only 30% of the ideal separation of bond valence sums. An ordered intergrowth of antiferro-orbitally ordered (LaMnO3 type) and charge and ferro-orbitally ordered (YBaMn2O6 type) blocks is observed. Off-centre Bi/Sr displacements are ferroelectrically ordered in this model. (C) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码：1369 / 1374
页数：6
相关论文
共 34 条
[1]   Charge disproportionation in RNiO3 perovskites:: Simultaneous metal-insulator and structural transition in YNiO3 [J].
Alonso, JA ;
García-Muñoz, JL ;
Fernández-Díaz, MT ;
Aranda, MAG ;
Martínez-Lope, MJ ;
Casais, MT .
PHYSICAL REVIEW LETTERS, 1999, 82 (19) :3871-3874
[2]   Spin structure and magnetic frustration in multiferroic RMn2O5 (R=Tb,Ho,Dy) -: art. no. 214402 [J].
Blake, GR ;
Chapon, LC ;
Radaelli, PG ;
Park, S ;
Hur, N ;
Cheong, SW ;
Rodríguez-Carvajal, J .
PHYSICAL REVIEW B, 2005, 71 (21)
[3]   VALENCE: A program for calculating bond valences [J].
Brown, ID .
JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1996, 29 :479-480
[4]   Structural anomalies and multiferroic behavior in magnetically frustrated TbMn2O5 -: art. no. 177402 [J].
Chapon, LC ;
Blake, GR ;
Gutmann, MJ ;
Park, S ;
Hur, N ;
Radaelli, PG ;
Cheong, SW .
PHYSICAL REVIEW LETTERS, 2004, 93 (17) :177402-1
[5]   Charge-ordered stripes in La1-xCaxMnO3 with x>0.5 [J].
Chen, CH ;
Cheong, SW ;
Hwang, HY .
JOURNAL OF APPLIED PHYSICS, 1997, 81 (08) :4326-4330
[6]   Magnetic and electrical properties of Bi1-xSrxMnO3: Hole-doping effect on ferromagnetic perovskite BiMnO3 [J].
Chiba, H ;
Atou, T ;
Syono, Y .
JOURNAL OF SOLID STATE CHEMISTRY, 1997, 132 (01) :139-143
[7]   Synthesis and characterization of (Bi,AE)MnO3 (AE = Ca, Sr) system [J].
Chiba, H ;
Atou, T ;
Faqir, H ;
Kikuchi, M ;
Syono, Y ;
Murakami, Y ;
Shindo, D .
SOLID STATE IONICS, 1998, 108 (1-4) :193-199
[8]   Orbital ordering as the determinant for ferromagnetism in biferroic BiMnO3 -: art. no. 064425 [J].
dos Santos, AM ;
Cheetham, AK ;
Atou, T ;
Syono, Y ;
Yamaguchi, Y ;
Ohoyama, K ;
Chiba, H ;
Rao, CNR .
PHYSICAL REVIEW B, 2002, 66 (06) :644251-644254
[9]   Evidence for the likely occurrence of magnetoferroelectricity in the simple perovskite, BiMnO3 [J].
dos Santos, AM ;
Parashar, S ;
Raju, AR ;
Zhao, YS ;
Cheetham, AK ;
Rao, CNR .
SOLID STATE COMMUNICATIONS, 2002, 122 (1-2) :49-52
[10]   Observation of coupled magnetic and electric domains [J].
Fiebig, M ;
Lottermoser, T ;
Fröhlich, D ;
Goltsev, AV ;
Pisarev, RV .
NATURE, 2002, 419 (6909) :818-820
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