Dataset Information

Crystal structure of silver carbonate iodide Ag₁₀(CO₃)₃I₄.

ABSTRACT: The title silver carbonate iodide, Ag₁₀(CO₃)₃I₄, deca-silver(I) tris-(carbonate) tetra-iodide, was recently reported as a precursor of the new superionic conductor Ag₁₇(CO₃)₃I₁₁. Ag₁₀(CO₃)₃I₄, was prepared by heating a stoichiometric powder mixture of AgI and Ag₂CO₃ at 430 K. A single-crystal suitable for X-ray diffraction analysis was obtained by slow cooling of a melt with an AgI-rich composition down from 453 K. Ag₁₀(CO₃)₃I₄ exhibits a layered crystal structure packed along [10], in which Ag atoms are inter-calated between the layers of hexa-gonally close-packed I atoms, and CO₃ groups. Up to now, Cs₃Pb₂(CO₃)₃I is the only other compound containing carbonate groups and iodide ions registered in the Inorganic Crystal Structure Database.

SUBMITTER: Suzuki R

PROVIDER: S-EPMC8382059 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Publications

Crystal structure of silver carbonate iodide Ag10(CO3)3I4.

Suzuki Ryoji R Watanabe Yuta Y Yamane Hisanori H Kitaura Mamoru M Uchida Kento K Matsushima Yuta Y

Acta crystallographica. Section E, Crystallographic communications 20210625 Pt 7

The title silver carbonate iodide, Ag10(CO3)3I4, deca-silver(I) tris-(carbonate) tetra-iodide, was recently reported as a precursor of the new superionic conductor Ag17(CO3)3I11. Ag10(CO3)3I4, was prepared by heating a stoichiometric powder mixture of AgI and Ag2CO3 at 430 K. A single-crystal suitable for X-ray diffraction analysis was obtained ...[more]

PMID: 34513021

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Project description:The cobalt carbonate hydroxide Co2CO3(OH)2 is a technologically important solid which is used as a precursor for the synthesis of cobalt oxides in a wide range of applications. It also has relevance as a potential immobilizer of the toxic element cobalt in the natural environment, but its detailed crystal structure is so far unknown. The structure of Co2CO3(OH)2 has now been investigated using density functional theory (DFT) simulations and powder X-ray diffraction (PXRD) measurements on samples synthesized via deposition from aqueous solution. Two possible monoclinic phases are considered, with closely related but symmetrically different crystal structures, based on those of the minerals malachite [Cu2CO3(OH)2] and rosasite [Cu1.5Zn0.5CO3(OH)2], as well as an orthorhombic phase that can be seen as a common parent structure for the two monoclinic phases, and a triclinic phase with the structure of the mineral kolwezite [Cu1.34Co0.66CO3(OH)2]. The DFT simulations predict that the rosasite-like and malachite-like phases are two different local minima of the potential energy landscape for Co2CO3(OH)2 and are practically degenerate in energy, while the orthorhombic and triclinic structures are unstable and experience barrierless transformations to the malachite phase upon relaxation. The best fit to the PXRD data is obtained using a rosasite model [monoclinic with space group P1121/n and cell parameters a = 3.1408 (4) Å, b = 12.2914 (17) Å, c = 9.3311 (16) Å and γ = 82.299 (16)°]. However, some features of the PXRD pattern are still not well accounted for by this refinement and the residual parameters are relatively poor. The relationship between the rosasite and malachite phases of Co2CO3(OH)2 is discussed and it is shown that they can be seen as polytypes. Based on the similar calculated stabilities of these two polytypes, it is speculated that some level of stacking disorder could account for the poor fit of the PXRD data. The possibility that Co2CO3(OH)2 could crystallize, under different growth conditions, as either rosasite or malachite, or even as a stacking-disordered phase intermediate between the two, requires further investigation.

Dataset Information

Crystal structure of silver carbonate iodide Ag₁₀(CO₃)₃I₄.

Publications

Crystal structure of silver carbonate iodide Ag<sub>10</sub>(CO<sub>3</sub>)<sub>3</sub>I<sub>4</sub>.

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