A Cesium Rare‐Earth Silicate Cs3RESi6O15 (RE=Dy–Lu, Y, In): The Parent of an Unusual Structural Class Featuring a Remarkable 57 Å Unit Cell Axis

The large number and structural beauty of silicates are largely due to the variety of connection mode of SiO4 tetrahedra. SiO6 and SiF6 octahedra are also known and give rise for structural versatility of inorganic silicates. However, to date, the crystal structure of inorganic fluorooxosilicates with oxofluoride SiOxF4−x or SiOxF6−x species are unknown. Now, fluorine was successfully introduced into the silicophosphates, and the first fluorooxosilicophosphate K4Si3P2O7F12 with an unprecedented SiO2F4 species was synthesized. The existence of Si−F bonds was verified by comprehensively experimental and theoretical work. Using ab initio and bond valence calculations, the oxofluoride SiOxF6−x species is shown to be stable when oxygen atoms connect to other atoms with strong covalent interactions. This work will contribute to the structural diversity of silicate chemistry by the exploration of the new fluorooxosilicates.

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A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

Han

Lei

Yang

et al. 2018

Angewandte Chemie

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A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

et al. 2018

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The large number and structural beauty of silicates are largely due to the variety of connection mode of SiO tetrahedra. SiO and SiF octahedra are also known and give rise for structural versatility of inorganic silicates. However, to date, the crystal structure of inorganic fluorooxosilicates with oxofluoride SiO F or SiO F species are unknown. Now, fluorine was successfully introduced into the silicophosphates, and the first fluorooxosilicophosphate K Si P O F with an unprecedented SiO F species was synthesized. The existence of Si-F bonds was verified by comprehensively experimental and theoretical work. Using ab initio and bond valence calculations, the oxofluoride SiO F species is shown to be stable when oxygen atoms connect to other atoms with strong covalent interactions. This work will contribute to the structural diversity of silicate chemistry by the exploration of the new fluorooxosilicates.

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A Layered Tin Bismuth Selenide with Three Different Building Blocks that Account for an Extremely Large Lattice Parameter of 283 Å

Nentwig

Eisenburger

Heinke

et al. 2020

Chemistry A European J

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The layered compound Sn2.8(4)Bi20.2(4)Se27 exhibits an extraordinarily long‐periodic 150R stacking sequence. The crystal structure contains three different building blocks, which form upon the addition of Sn to a Bi‐rich bismuth selenide. Sn‐doped Bi2 double (“2”) layers similar to those in elemental bismuth, Sn0.3Bi1.7Se3 quintuple (“5”) layers and Sn0.4Bi2.6Se4 septuple (“7”) layers are arranged in a 7525757525|7525757525|7525757525 sequence, which corresponds to a structure with a=4.1819(4) and c=282.64(6) Å in space group Rtrue3‾ m. The structure of a microcrystal was determined using microfocused synchrotron radiation and refined as a formally commensurately modulated structure in (3+1)D superspace (superspace group Rtrue3‾ m(00γ)00), with a trivial basic structure that contains just one atom. The stacking sequence as well as the cation distribution are confirmed by aberration‐corrected scanning transmission electron microscopy (STEM) in combination with chemical mapping by X‐ray spectroscopy with atomic resolution. Stacking faults are not typical but have been observed occasionally.

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A Cesium Rare‐Earth Silicate Cs₃RESi₆O₁₅ (RE=Dy–Lu, Y, In): The Parent of an Unusual Structural Class Featuring a Remarkable 57 Å Unit Cell Axis

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record.

Cited by 3 publications

References 17 publications

A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

A Layered Tin Bismuth Selenide with Three Different Building Blocks that Account for an Extremely Large Lattice Parameter of 283 Å

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A Cesium Rare‐Earth Silicate Cs3RESi6O15 (RE=Dy–Lu, Y, In): The Parent of an Unusual Structural Class Featuring a Remarkable 57 Å Unit Cell Axis

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record.

Cited by 3 publications

References 17 publications

A Fluorooxosilicophosphate with an Unprecedented SiO2F4 Species

A Fluorooxosilicophosphate with an Unprecedented SiO2F4 Species

A Fluorooxosilicophosphate with an Unprecedented SiO2F4 Species

A Layered Tin Bismuth Selenide with Three Different Building Blocks that Account for an Extremely Large Lattice Parameter of 283 Å

Contact Info

Product

Resources

About

A Cesium Rare‐Earth Silicate Cs₃RESi₆O₁₅ (RE=Dy–Lu, Y, In): The Parent of an Unusual Structural Class Featuring a Remarkable 57 Å Unit Cell Axis

A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species

A Fluorooxosilicophosphate with an Unprecedented SiO₂F₄ Species