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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Crystal growth and co-substitution in (Mg_(1-x)Fe_x)(Mo_(2-x)V_x)O_7 (0.13 <=x<=0.47) with (V/Mo)=O oxo double bonds
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Crystal growth and co-substitution in (Mg_(1-x)Fe_x)(Mo_(2-x)V_x)O_7 (0.13 <=x<=0.47) with (V/Mo)=O oxo double bonds

机译：（Mg_（1-x）Fe_x）（Mo_（2-x）V_x）O_7（0.13 <= x <= 0.47）中具有（V / Mo）= O氧代双键的晶体生长和共取代

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摘要

New solid solution crystals of (Mg_(1-x)Fe_x)(Mo_(2-x)V_x)O_7 (0.13 <=x<=0.47) were grown from MgO-Fe_2O_3-V_2O_5-MoO_3 melts. Single crystal X-ray diffraction studies reveal that the structure consists of (Mg/Fe)_2O_(10) octahedral dimers and [(Mo_(2-x)V_x)O_7]~((2+x)-) tetrahedral clusters. The structure contains (V/Mo)=O oxo double bonds similar to MgMo_2O_7 and FeVMoO_7. Equimolar co-substitution of V~(5+) for Mo~(6+) and Fe~(3+) for Mg~(2+) avoids the creation of any ion vacancies or interstitials and generates disordered cation sites. Crystal data: for (Mg_(0.87)Fe_(0.13))(Mo_(1.87)V_(0.13))O_7, monoclinic, space group P2_1 (No. 14), with a=8.3356(6) A, b=9.1079(6) A, c=8.5086(6) A, beta=111.927(1) deg and Z=4; for (Mg_(0.53)Fe_(0.47))(Mo_(1.53)V_(0.47))O_7, monoclinic, space group P2_1 (No. 14), with a=8.2766(6) A, b=9.0208(7) A, c=8.4817(6) A, beta=112.144(1) deg and Z=4.
机译：从MgO-Fe_2O_3-3-V_2O_5-MoO_3熔体中生长了新的（Mg_（1-x）Fe_x）（Mo_（2-x）V_x）O_7（0.13 <= x <= 0.47）的固溶体晶体。单晶X射线衍射研究表明该结构由（Mg / Fe）_2O_（10）八面体二聚体和[（Mo_（2-x）V_x）O_7]〜（（2 + x）-）四面体簇组成。该结构包含与MgMo_2O_7和FeVMoO_7类似的（V / Mo）= O氧代双键。 V〜（5+）对Mo〜（6+）和Fe〜（3+）对Mg〜（2+）的等摩尔共取代避免了任何离子空位或间隙的产生，并产生了无序的阳离子位点。晶体数据：对于（Mg_（0.87）Fe_（0.13））（Mo_（1.87）V_（0.13））O_7，单斜晶系，空间群P2_1 / n（第14号），a = 8.3356（6）A，b = 9.1079（6）A，c ＝ 8.5086（6）A，β＝ 111.927（1）deg，Z ＝ 4;对于（Mg_（0.53）Fe_（0.47））（Mo_（1.53）V_（0.47））O_7，单斜，空间群P2_1 / n（第14号），a = 8.2766（6）A，b = 9.0208（7 ）A，c ＝ 8.4817（6）A，β＝ 112.144（1）度，Z ＝ 4。

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