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首页> 外文期刊>Crystallography reports >Determination of the Crystal Structure of Diopside(Ca_(0.8)Fe_(0.2))(Mg_(0.8)Fe_(0.2))Si_20_6 from the Gazakh Trough (Azerbaijan)
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Determination of the Crystal Structure of Diopside(Ca_(0.8)Fe_(0.2))(Mg_(0.8)Fe_(0.2))Si_20_6 from the Gazakh Trough (Azerbaijan)

机译:从Gazakh槽(阿塞拜疆)确定透辉石(Ca_(0.8)Fe_(0.2))(Mg_(0.8)Fe_(0.2))Si_20_6的晶体结构

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摘要

The crystal structure of a clinopyroxene is determined by X-ray diffraction. The unit cell parameters are as follows: a = 9.732(7) ?, b = 8.896(6) ?, c = 5.280(4) ?, and β = 106.160(11)°; V= 439.1(5) A3; space group C2/c; and Z= 4. The structure is determined by the direct method and refined in the anisotropic approximation by the full-matrix least-squares method (R[F_2 > 2σ(F_2)] = 0.027, wR(F_2) = 0.072). According to the results of the X-ray structure analysis, the crystal chemical formula of the compound is (Ca_(0.8)Fe_(0.2))(Mg_(0.8)Fe_(0.2))Si_2O_6. In the structure, columns of (Mg, Fe)-octahedra are connected on two sides with Si_2O_6 chains. The resulting structural units have the [(Mg,Fe)_2(Si_2O_6)_2]~(4-) composition. These units form a heterogeneous framework, which is typical of all pyroxene structures. The I(Mg,Fe)_2(Si_2O_6)_2]~(2-) composition of the framework corresponds to the ratio [(Mg,Fe) + Si: O = 3: 6 (1: 2). The (Ca, Fe) atoms are located in the holes of the framework.
机译:环吡咯的晶体结构通过X射线衍射确定。晶胞参数如下:a = 9.732(7)θ,b = 8.896(6)θ,c = 5.280(4)θ,β= 106.160(11)°。 V = 439.1(5)A3;空间组C2 / c; Z =4。通过直接法确定结构,并通过全矩阵最小二乘法(R [F_2>2σ(F_2)] = 0.027,wR(F_2)= 0.072)进行各向异性逼近。根据X射线结构分析的结果,该化合物的晶体化学式为(Ca_(0.8)Fe_(0.2))(Mg_(0.8)Fe_(0.2))Si_2O_6。在该结构中,(Mg,Fe)-八面体的列在两侧通过Si_2O_6链连接。所得的结构单元具有[(Mg,Fe)_2(Si_2O_6)_2]〜(4-)组成。这些单元形成异质构架,这是所有辉石结构的典型特征。骨架的I(Mg,Fe)_2(Si_2O_6)_2]〜(2-)组成对应于[(Mg,Fe)+ Si:O = 3:6(1:2)。 (Ca,Fe)原子位于骨架的孔中。

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