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Synthesis and crystal structures of two polymorphs of trilanthanum iridium septaoxide (La_3IrO_7)

机译:三氧化镧铱(La_3IrO_7)的两种多晶型物的合成和晶体结构

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摘要

Two polymorphs of trilanthanum iridium septaoxide, La_3IrO _7, were prepared as single crystals using a molten cesium hydroxide flux and were structurally characterized using single-crystal X-ray diffraction. Polymorph A crystallizes in the orthorhombic space group Cmcm with unit cell dimensions of a = 11.2103(3) ?, b = 7.4982(2) ?, and c = 7.6110(2) ?. Polymorph B crystallizes into the monoclinic space group P21 with the unit cell dimensions of a = 8.8512(5) ?, b = 5.7167(3) ?, c = 24.4454(13) ?, and b = 95.542(2)°. The crystal structure of polymorph A is isostructural to the family of compounds with formula Ln_3MO _7 (M = Nb~(5+), Mo~(5+), Ru~(5+), Ta ~(5+), Re~(5+), Os~(5+), and Ir~(5+)) while the crystal structure of polymorph B has no known corollaries.
机译:使用熔融的氢氧化铯助熔剂,制备了七氧化三铱铱氧化物的两个多晶型物La_3IrO_7,并将其作为单晶,并使用单晶X射线衍射对其结构进行了表征。多晶型物A在正交晶空间群Cmcm中结晶,其晶胞尺寸为a = 11.2103(3),b = 7.4982(2),c = 7.6110(2)。多晶型物B结晶成单斜晶空间群P21 / n,其晶胞尺寸为a = 8.8512(5),b = 5.7167(3),c = 24.4454(13),b = 95.542(2)°。多晶型物A的晶体结构与式Ln_3MO _7(M = Nb〜(5+),Mo〜(5+),Ru〜(5+),Ta〜(5+),Re〜 (5 +),Os〜(5+)和Ir〜(5+)),而多晶型物B的晶体结构没有已知推论。

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