Preparation of C12A7 Nanoparticles by Laser Vaporization and Their Phase Transformations During Thermal Treatment
Full article
| Journal |
Ceramics International
ISSN: 0272-8842
|
| Output data |
Year: 2025,
Volume: 51,
Number: 3,
Pages: 3675-3681
Pages count
: 7
DOI:
10.1016/j.ceramint.2024.11.343
|
| Tags |
Crystallization; Electride; Laser vaporization; Mayenite; Nanopowder synthesis |
| Authors |
Kapishnikov Aleksandr
1,2
,
Snytnikov Valeriy
1
,
Gerasimov Evgeniy
1
,
Volodin Vladimir
2,3
,
Volodin Alexander
1
,
Geydt Pavel
2
|
| Affiliations |
| 1 |
Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 5, 630090, Novosibirsk, Russia
|
| 2 |
Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str. 2, 630090, Novosibirsk, Russia
|
| 3 |
Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 13, 630090, Novosibirsk, Russia
|
|
Funding (3)
|
1
|
Ministry of Science and Higher Education of the Russian Federation
|
FSUS-2024-0020
|
|
2
|
Ministry of Science and Higher Education of the Russian Federation
|
FWUR-2024-0033
|
|
3
|
Ministry of Science and Higher Education of the Russian Federation
|
FWUR-2024-0034
|
Nanodispersed systems with the stoichiometry of Ca12Al14O33 (12CaO·7Al2O3 or C12A7) have been prepared by vaporization of polycrystalline C12A7 target under the influence of continuous radiation from a CO2-laser in a He atmosphere with 0.2 bar pressure. The resulting powders were X-ray amorphous with well-developed specific surface area ∼115 m2/g and had characteristic nanoparticle sizes in the range of 20–30 nm. Despite the presence of different Ca-Al oxide impurities (CaO, Al2O3, Ca3Al2O6), the chemical composition of the resultant amorphous material was close to the stoichiometry of C12A7. The "in situ" X-ray diffraction (XRD) technique has been used to investigate the changes in the phase composition of the material under different (air or helium) gas environment in the temperature range of 100–900 °C. It has been demonstrated that the formation and recrystallization of the mayenite phase in nanoparticles system started in the temperature range of 700–800 °C, mostly independent of the oxidizing character of the gas environment (oxidizing or inert).