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首页> 外文期刊>Materials Research Bulletin >A study on the nuclear and magnetic structure of the double perovskites A_2FeWO_6(A=Sr, Ba) by neutron powder diffraction and reverse Monte Carlo modeling
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A study on the nuclear and magnetic structure of the double perovskites A_2FeWO_6(A=Sr, Ba) by neutron powder diffraction and reverse Monte Carlo modeling

机译:中子粉末衍射和反向蒙特卡洛模拟研究双钙钛矿A_2FeWO_6(A = Sr,Ba)的核磁结构

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摘要

Perovskite-type complex metal oxides A_2FeWO_6(A=Sr, Ba) were prepared by a standard solid state reaction method. Rietveld analysis of neutron powder diffraction (NPD) data at 295 K shows that the Sr_2FeWO_6(SFW) compound adopts a monoclinic unit cell (space group P2_1, a=5.6480(4), b=5.6088*4), c=7.9362(6) A and β=89.99 (2)°), and the Ba_2FeWO_6 (BFW) compound is tetragonal (space group I4/m, a=5.7547 (4), c-8.125 (1) A). A combi- nation of a reverse Monte Carlo (RMC) technique and Rietveld analysis shows that the low temperature (10 K) magnetic structures of SFW and BFW are antiferromagnetic based on a unit cell related to that of the nuclear structure by a propagation vector, k=(0 1/2 1 /2).
机译:通过标准的固态反应方法制备钙钛矿型复合金属氧化物A_2FeWO_6(A = Sr,Ba)。 295 K的中子粉末衍射(NPD)数据的Rietveld分析表明,Sr_2FeWO_6(SFW)化合物采用单斜晶胞(空间群P2_1 / n,a = 5.6480(4),b = 5.6088 * 4),c = 7.9362 (6)A和β= 89.99(2)°),并且Ba_2FeWO_6(BFW)化合物是四方的(空间群I4 / m,a = 5.7547(4),c-8.125(1)A)。反向蒙特卡洛(RMC)技术和Rietveld分析的结合表明,SFW和BFW的低温(10 K)磁性结构是反铁磁性的,其基础是通过传播矢量与核结构相关的晶胞, k =(0 1/2 1/2)。

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