Effect of strontium atoms substitution on the features of two-slab structure of Sr1-xCaxLa2Sc2O7 scandates

IF 0.4 Q4 CHEMISTRY, ANALYTICAL
Y. Titov, N. Belyavina, M. Slobodyanik, O. Nakonechna, N. Strutynska
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引用次数: 0

Abstract

Effects of substitution of the Strontium atoms with smaller Calcium atoms on the structural features of the Ruddlesden-Popper SrLa2Sc2O7 two-slab compound is established. The crystal structure of orthorhombic Sr0.85Ca0.15La2Sc2O7 phase with maximum degree of substitution was determined by the Rietveld method (Fmmm space group, a = 0.5766(2) nm, b = 0.5743(2) nm, c = 2.0522(7) nm). Comparison of the structural features of SrLa2Sc2O7 and Sr0.85Ca0.15La2Sc2O7 shows that such type of substitution leads to a decrease in the (La,Sr)2 - О2 interblock bond length (from 0.222 (2) nm at x = 0 to 0.215 (1) nm at x = 0.15). The decrease in interblock bond length brings the constitution of the two-dimensional structure Sr1-хCaxLa2Sc2O7 closer to the structure of the three-dimensional perovskite, leads to its instability at х > 0.15 and gives a reason to conclude that this factor causes a limitation of region of the Sr1-хCaxLa2Sc2O7 solid solutions with a slab perovskite-like structure. Presence of such structure changes is the precondition for regulation of structural-dependent features of the materials on the base of scandates alkaline-earth and rare earth metals.
锶原子取代对Sr1-xCaxLa2Sc2O7钪酸盐双板结构特征的影响
研究了用更小的钙原子取代锶原子对Ruddlesden-Popper SrLa2Sc2O7双板状化合物结构特征的影响。采用Rietveld法测定了具有最大取代度的正交Sr0.85Ca0.15La2Sc2O7相的晶体结构(Fmmm空间群,a = 0.5766(2) nm, b = 0.5743(2) nm, c = 2.0522(7) nm)。对比SrLa2Sc2O7和Sr0.85Ca0.15La2Sc2O7的结构特征表明,这种取代导致(La,Sr)2 - О2嵌段键长度从x = 0时的0.222 (2)nm减小到x = 0.15时的0.215 (1)nm。嵌段键长的减小使二维结构Sr1-хCaxLa2Sc2O7更接近三维钙钛矿结构,导致其在> 0.15处不稳定,并有理由认为这一因素导致Sr1-хCaxLa2Sc2O7固溶体具有板状钙钛矿结构的区域受限。这种结构变化的存在是在碱土和稀土金属基础上调节材料结构依赖特性的前提。
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来源期刊
French-Ukrainian Journal of Chemistry
French-Ukrainian Journal of Chemistry CHEMISTRY, ANALYTICAL-
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13
审稿时长
4 weeks
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