NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2019, 10 (6), P. 694–700
Facile combustion synthesis of TbFeO3 nanocrystals with hexagonal and orthorhombic structure
K. D. Martinson – Ioffe Institute, Politeknicheskaya St., 26, St. Petersburg, 194021, Russia; email@example.com
V. A. Ivanov – Saint Petersburg State Institute of Technology, Moskovsky prospect 26, Saint Petersburg, 190013, Russia
M. I. Chebanenko – Ioffe Institute, Politeknicheskaya St., 26, St. Petersburg, 194021, Russia
V.V. Panchuk – Saint Petersburg State University, Peterhof, 198504 Saint Petersburg, Russia
V. G. Semenov – Saint Petersburg State University, Peterhof, 198504 Saint Petersburg, Russia
V. I. Popkov – Ioffe Institute, Politeknicheskaya St., 26, St. Petersburg, 194021, Russia
In this research, the formation process of nanocrystalline terbium orthoferrite (TbFeO3) obtained via a solution combustion technique was studied using powder X-ray diffractometry, scanning electron microscopy, 57Fe Mössbauer spectroscopy, N2 adsorption analysis, and FTIR spectroscopy. It was shown that glycine-nitrate combustion method permits one to obtain TbFeO3 of three different modifications: orthorhombic o-TbFeO3 (Pbnm), hexagonal h-TbFeO3 (P63/mmc) and amorphous am-TbFeO3. It was found that the average crystallite sizes of orthorhombic and hexagonal TbFeO3 were 29±3 and 15±2 nm, respectively. The formation mechanism of different structural forms of terbium orthoferrite was investigated on the basis of nanopowders morphology, specific surface areas, average pore sizes, and crystallite sizes.
Keywords: nanocrystals, rare earths, orthoferrites, terbium orthoferrite, TbFeO3, phase formation, polymorphism.
PACS 61.46.+w, 75.50.Bb, 75.60.-d