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Crystal structure of Sr_2MgWO_6 and Ba_2SrWO_6 determined by powder X-ray diffraction

机译:粉末X射线衍射测定Sr_2MgWO_6和Ba_2SrWO_6的晶体结构

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摘要

The crystal structures of Sr_2MgWO_6 and Ba_2SrWO_6 compounds, studied by powder X-ray diffraction, were found to be distorted perovskites with a complete NaCl type ordering between Mg~(2+)/W~(6+) and Sr~(2+)/W~(6+) ions, respectively. The unit cells are characterized by the tetragonal (space group I4/m; a~0a~0a~-) symmetry, with the parameters a = 5.5849(10) A and c = 7.9455(10) A, for Sr_2MgWO_6 and triclinic (space group F-1; a~-b~-b~-) symmetry, with the parameters a = 8.5409(10) A, b = c = 8.5860(10) A, α = 89.35(l)° and β = γ=90.31(1)°, for Ba_2SrWO_6.
机译:通过粉末X射线衍射研究发现,Sr_2MgWO_6和Ba_2SrWO_6化合物的晶体结构是畸变的钙钛矿,其NaCl类型完全在Mg〜(2 +)/ W〜(6+)和Sr〜(2+)之间。 / W〜(6+)离子。对于Sr_2MgWO_6和三斜晶(空间),晶胞具有四边形(空间组I4 / m; a〜0a〜0a〜-)对称性,参数a = 5.5849(10)A和c = 7.9455(10)A F-1组; a〜-b〜-b〜-)对称,参数a = 8.5409(10)A,b = c = 8.5860(10)A,α= 89.35(l)°和β=γ=对于Ba_2SrWO_6为90.31(1)°。

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