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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Na2Si3O7: an incommensurate structure with crenel-type modulation functions, refined from a twinned crystal.
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Na2Si3O7: an incommensurate structure with crenel-type modulation functions, refined from a twinned crystal.

机译：Na2Si3O7：具有双锥型调制功能的不对称结构，由孪生晶体精制而成。

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摘要

The structure of metastable, incommensurately modulated Na(2)Si(3)O(7) has been determined from single-crystal X-ray diffraction data. In contrast to previous investigations which stated that the compound crystallizes in an orthorhombic space group, this study shows that the compound is monoclinic with a pseudo-orthorhombic cell and is affected by twinning. The structure is described in the (3 + 1)-dimensional superspace. Crenel-type modulation functions are used to account for an aperiodic sequence of right- and left-handed zweier single chains of silicate tetrahedra. The modulation mainly affects one of the two symmetrically independent tetrahedral chains, which are connected to build up [Si(3)O(7)](2-) layers. Sodium cations are coordinated by five oxygen ligands and provide linkage between adjacent tetrahedral sheets. Distortions of the silicate tetrahedra and crystal chemical relationships of the title compound to sodium and lithium di- and metasilicates are discussed in detail.
机译：从单晶X射线衍射数据确定了亚稳态，不相称调制的Na（2）Si（3）O（7）的结构。与先前的研究表明该化合物在正交晶空间群中结晶相反，该研究表明该化合物是单斜晶且具有拟斜晶细胞，并且受孪生影响。该结构在（3 + 1）维超空间中描述。克里涅尔型调制函数用于解释硅酸四面体的右手和左手zweier单链的非周期性序列。调制主要影响两个对称独立的四面体链之一，这些四面体链被连接以建立[Si（3）O（7）]（2-）层。钠阳离子由五个氧配体配位，并在相邻的四面体片之间提供连接。详细讨论了硅酸盐四面体的变形以及标题化合物与硅酸钠和二硅酸锂和偏硅酸锂的晶体化学关系。

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