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首页> 外文期刊>Crystallography reports >Crystal structure (Pb_(4.8)Na_(1.2))[Si_8(Si _(1.2)B_(0.8))O_(25)] with a new double tetrahedral layer and its comparison with hyttsjoeite, barisilite, benitoite, and langasite
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Crystal structure (Pb_(4.8)Na_(1.2))[Si_8(Si _(1.2)B_(0.8))O_(25)] with a new double tetrahedral layer and its comparison with hyttsjoeite, barisilite, benitoite, and langasite

机译：具有新的双四面体层的晶体结构（Pb_（4.8）Na_（1.2））[Si_8（Si _（1.2 _B_（0.8））O_（25）]以及与水滑石，重晶石，贝氏体和蓝铁矿的比较

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摘要

A new lead-sodium borosilicate (Pb_(4.8)Na_(1.2))[Si_8(Si _(1.2)B_(0.8))O_(25)] (a = 9.5752 and c = 42.565 ?; space group R3?c is synthesized under hydrothermal conditions, and its crystal structure is determined without preliminary knowledge of the chemical formula. The anionic radical of a new type is a double layer in which one of the three independent Si-tetrahedra contains an isomorphous boron admixture. Its topological relationship with the radicals in the structures of benitoite and langasite, as well as in the structures of lead silicates barisilite and hyttsjoeite, is found based on the block consisting of an octahedron and six tetrahedra. This allows one to consider that the new layer is derived from the hyttsjoeite layer by the replacement of the octahedron with two tetrahedra and the increase of the silicon fraction. Although lead atoms are located between the layers in the intersheet space, they form relatively strong bonds with silicon-oxygen layers. This structural type is a collector of heavy metals.
机译：一种新的硼硅酸铅钠（Pb_（4.8）Na_（1.2））[Si_8（Si _（1.2）B_（0.8））O_（25）]（a = 9.5752和c = 42.565 ?;空间群R3？c为在水热条件下合成，其晶体结构无需化学式的初步了解即可确定，新型的阴离子基团是双层结构，其中三个独立的Si-四面体之一包含同质硼混合物。在由八面体和六个四面体组成的嵌段的基础上，发现了膨润土和硅铝石结构中的自由基，以及硅酸铅硅酸盐和水滑石中的自由基，这使人们可以认为新层是由八面体被两个四面体取代，增加了硅的含量，尽管铅酸位于层间空间的各层之间，但它们与硅-氧层形成了相对较强的键。是重金属的收集者。

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