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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Order, disorder and structural modulations in Bi-Fe-W-O-Br Sillen-Aurivillius intergrowths
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Order, disorder and structural modulations in Bi-Fe-W-O-Br Sillen-Aurivillius intergrowths

机译:Bi-Fe-W-O-Br Sillen-Aurivillius共生物中的有序,无序和结构调节

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Transmission electron microscopy observations on a new complex oxybromide with nominal composition Bi4Fe1/3W2/3O8Br, heated at high temperature, reveal the transformation of its basic structure yielding two types of crystals. The first crystal type shows ordered and disordered extended defects leading to a new family of intergrowths between one Sillen block and n Aurivillius blocks and occasionally between one Aurivillius block and n Sillen blocks. The second type presents a compositionally modulated structure, determined by electron diffraction, with an average composition Bi4Fe1/2W1/2O8-delta Br and unit-cell parameters a = (1/gamma) 3.8, b = 3.8, c = 14.5 angstrom (gamma = 0.10-0.15) in the superspace group Immm[(1-gamma)00] no. 71.1.
机译:在高温下对标称组成为Bi4Fe1 / 3W2 / 3O8Br的新型复合氢溴酸盐的透射电子显微镜观察表明,其基本结构发生了转变,产生了两种类型的晶体。第一种晶体类型显示出有序且无序的扩展缺陷,从而导致一个Sillen块与n个Aurivillius块之间以及偶尔在一个Aurivillius块与n Sillen块之间形成新的共生族。第二种类型具有通过电子衍射确定的成分调制结构,平均成分为Bi4Fe1 / 2W1 /2O8-δBr,晶胞参数a =(1 /γ)3.8,b = 3.8,c = 14.5埃(γ = 0.10-0.15)在超空间组Immm [(1-gamma)00]中。 71.1。

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