Synthesis and thermal transformations of layered double hydroxide containing samarium

• Published in: Journal of the Australian Ceramic Society 2022-12, Vol.58 (5), p.1615-1622
• Main Authors: Golovin, Sergei N., Yapryntsev, Maksim N., Lebedeva, Olga E.
• Format: Article
• Language: English
• Subjects: Ceramics; Chemistry and Materials Science; Composites; Glass; Inorganic Chemistry; Materials Engineering; Materials Science; Natural Materials
• ISSN: 2510-1560; 2510-1579
• DOI: 10.1007/s41779-022-00798-z

Nickel-aluminum layered double hydroxide with aluminum ions partially substituted by samarium ones was successfully synthesized via coprecipitation followed by hydrothermal treatment. X-ray diffraction data showed that the obtained sample is single-phase material with hydrotalcite-like structure. The presence of samarium in the sample was confirmed by elemental analysis. Electron microscopy demonstrated that the compound consists of very small plate-like particles with a shape similar to hexagonal. The study of thermal transformations of the material revealed that it decomposed upon heating above 300 °C with the formation of mixed oxide, and spinel-type oxide was formed while the heating temperature was increased up to 1000 °C. The rehydration ability of the sample was rather limited: no reconstruction of layered structure took place after mixed oxide was formed. The “memory effect” was observed only after heating the hydroxide at a temperature not higher than 300 °C. The thermal properties of samarium-containing samples resemble closely those of nickel-containing hydrotalcites.