Structural Aspects of “Memory Effect” for MgGa LDHs: New Data Obtained by Simulation of XRD Patterns for 1D Disordered Crystals Full article
| Journal |
Crystals
, E-ISSN: 2073-4352 |
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| Output data | Year: 2022, Volume: 12, Number: 5, Article number : 629, Pages count : 14 DOI: 10.3390/cryst12050629 | ||||
| Tags | layered double hydroxide; one-dimensional disordered structure; simulation; “memory effect” | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0006 |
Abstract:
Simulation of diffraction patterns for 1D disordered crystals was used to investigate the structure of the initial CO32− containing MgGa LDHs with a different Mg2+/(Mg2+ + Ga3+) ratio equal to 0.67, 0.75, and 0.80; mixed oxides obtained by calcination of LDHs at a temperature of 550◦C; and the hydroxide obtained by hydration of MgGa oxide with the Mg2+ content of 0.80. The initial LDHs contain lamellar inclusions of manasseite structure (polytype 2H1) in the hydrotalcite structure (3R1). A loss of water at 200◦C leads to the formation of a metastable dehydrated phase where layers are packed, as in polytypes 3R2 and 1H, with turbostratic disorder. The structure of mixed oxides is also layered and consists of periclase-like octahedral layers and spinel-like octahedral-tetrahedral layers. Hydration of the oxides results in restoring the initial layered hydrotalcite structure (polytype 3R1) for Mg2+ mole fractions 0.67 and 0.75. For the Mg2+ content of 0.80, the phase composition is represented by the hydroxide with hydrotalcite structure and the layered mixed hydroxide with the alternation of hydrotalcite and brucite lamellar domains, which was also revealed by calculation of diffraction patterns using models of 1D disordered crystals. © 2022 by the authors.
Cite:
Leont’eva N.N.
, Cherepanova S.V.
, Stepanova L.N.
, Drozdov V.A.
, Lavrenov A.V.
Structural Aspects of “Memory Effect” for MgGa LDHs: New Data Obtained by Simulation of XRD Patterns for 1D Disordered Crystals
Crystals. 2022. V.12. N5. 629 :1-14. DOI: 10.3390/cryst12050629 WOS Scopus РИНЦ AN OpenAlex publication_identifier_short.sciact_ihcp_identifier_type
Structural Aspects of “Memory Effect” for MgGa LDHs: New Data Obtained by Simulation of XRD Patterns for 1D Disordered Crystals
Crystals. 2022. V.12. N5. 629 :1-14. DOI: 10.3390/cryst12050629 WOS Scopus РИНЦ AN OpenAlex publication_identifier_short.sciact_ihcp_identifier_type
Dates:
| Submitted: | Apr 13, 2022 |
| Accepted: | Apr 25, 2022 |
| Published online: | Apr 27, 2022 |
| Published print: | May 22, 2022 |
Identifiers:
| Web of science: | WOS:000802377100001 |
| Scopus: | 2-s2.0-85131259177 |
| Elibrary: | 48719694 |
| Chemical Abstracts: | 2022:1436429 |
| OpenAlex: | W4293238474 |
| publication_identifier.sciact_ihcp_identifier_type: | 3717 |