Structure Refinement of (Sr,Ba)Nb2O6 Ceramic Powder from Neutron and X-Rays Diffraction Data

Materials Research

J.g. Carrio¹  Y.p. Mascarenhas²  W. Yelon²  I.a. Santos²  D. Garcia²  J.a. Eiras² 

[1] ,Universidade Estadual Norte FluminenseCampos dos Goytacazes RJ ,Brasil

关键词: strontium barium niobate;    tungsten bronze structure;    X-ray diffraction;    neutron diffraction;   

DOI  :  10.1590/S1516-14392002000100010

来源: SciELO

【 摘 要 】

The structure of polycrystalline strontium barium niobate at room temperature was refined by the Rietveld method. Sintered ceramic samples were used to collect powder neutron and X-ray diffraction data. The ratio Sr/Ba ~ 64/36 was found from the initial batch composition Sr0.61Ba0.39Nb2O6, corroborating with the quantitative X-ray dispersive spectroscopy (EDS) measurements. The structure is tetragonal with cell parameters a, b = 12.4504(3) Å and c = 3.9325(1) Å and space group P4bm. It was not necessary to introduce any positional disorder for the oxygen atoms. Cation Nb+5 displacements not parallel to the c direction are presented, which can influence the behavior of the ferroelectric properties.

【 授权许可】

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