The Interaction of Defects in a Mayenite Structure | Sciact - CRIS-system of Boreskov Institute of Catalysis

The Interaction of Defects in a Mayenite Structure Full article

Journal

PCCP: Physical Chemistry Chemical Physics
ISSN: 1463-9076 , E-ISSN: 1463-9084

Output data

Year: 2020, Volume: 22, Number: 47, Pages: 27818-27828 Pages count : 11 DOI: 10.1039/d0cp05107a

Tags

Alumina; Aluminum oxide; Calcium oxide; Garnets; Raman spectroscopy; Rare earths; Sodium Aluminate; Zeolites

Authors

Shkerin Sergey N. ¹ , Ulyanova Ekaterina S. ² , Naumov Sergey V. ³ , Shmakov Aleksandr N. ^4,5 , Tolkacheva Anna S. ^1,6

Affiliations

1	The Institute of High-Temperature Electrochemistry UB RAS, 620137 Ekaterinburg, Russia
2	Institute of Solid-State Chemistry UB RAS, 620137 Ekaterinburg, Russia
3	M.N. Miheev Institute of Metal Physics UB RAS, 620137 Ekaterinburg, Russia
4	Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
5	Novosibirsk National Research State University, Novosibirsk, Russia
6	School of Engineering, INMT Ural Federal University, 620002 Ekaterinburg, Russia

Funding (3)

1	Ministry of Science and Higher Education of the Russian Federation	05.621.21.0022 (RFMEFI62119X0022) (АААА-А20-120072290017-9)
2	Federal Agency for Scientific Organizations	007-00337-18-00 (АААА-А18-118020290104-2)
3	Ministry of Science and Higher Education of the Russian Federation	0395-2019-0002

Calcium aluminate Ca12Al14O33 initially known as cement compound after a series of structural refinements presented a complex cubic structure. It demonstrates a surprising feature consisting of the occurrence of spherical cavities named as cages. After this, mayenite is regarded as a kind of anti-zeolite. An alternative representation of such compounds formulated as highly non-stoichiometric garnets is highlighted in the present study. Mayenite is described as non-stoichiometric garnet {Ca3–x□x}1[Ca, Al]2Al3O12–x using the Raman spectroscopy. The dependence of phase diagram Al2O3–CaO in the region near the mayenite composition on the oxygen activity is summarized regarding its structural deficiency. It is pointed that cage is the result of defects association whereas structural defects tend to interact with each other. The main consequence of such interaction is a spontaneous formation of a core–shell structure. It is evidenced by the presence of a near-surface layer of small thickness over a compact oxide. The local symmetry of the mayenite structure at room temperature in oxidized and reduced (electride) state was studied by Raman spectroscopy which revealed the presence of luminescence without the rare-earths’ doping.

Shkerin S.N. , Ulyanova E.S. , Naumov S.V. , Shmakov A.N. , Tolkacheva A.S.
The Interaction of Defects in a Mayenite Structure
PCCP: Physical Chemistry Chemical Physics. 2020. V.22. N47. P.27818-27828. DOI: 10.1039/d0cp05107a WOS Scopus РИНЦ AN OpenAlex

Submitted:	Sep 28, 2020
Accepted:	Nov 9, 2020
Published online:	Nov 27, 2020

Web of science:	WOS:000599460800033
Scopus:	2-s2.0-85098199069
Elibrary:	45054465
Chemical Abstracts:	2020:2503547
OpenAlex:	W3107823303

DB	Citing
Scopus	2
Web of science	2
Elibrary	3
OpenAlex	2