Structural, morphological, and magnetic features of granular TbFeO3 perovskite synthesized via direct solution combustion synthesis.

Terbium orthoferrite (TbFeO₃) perovskite demonstrates specific magnetic properties which are object of interest. Aggregated granular nanopowder of TbFeO₃ particles of 85.6 nm were obtained by direct solution combustion method. The orthorhombic perovskite structure (space group Pbnm) of the terbium orthoferrite was confirmed by powder X-ray diffraction, Raman spectroscopy and ⁵⁷Fe Mössbauer spectroscopy. The unusual granular morphology and mesoporous structure of the nanopowder were investigated by scanning electron microscopy and adsorption-structural analysis via low-temperature (77 K) adsorption-desorption of nitrogen with a total porosity of 0.0145 cm³/g and average pore width of 12 nm. The magnetic properties of TbFeO₃ nanoparticles were thoughtfully studied, M = 34.2 emu/g at T = 10 K, H_c = 300 Oe. The onset of reorientation of the Fe³⁺ spin system at T ~ 18 K and the antiferromagnetic ordering of Tb³⁺ ions at T ~ 4 K were observed by vibrational magnetometry. Obtained results confirm the flexible paramagnetic to antiferromagnetic behavior of granular TbFeO₃ nanopowder. Highlight: Granular nanopowder of TbFeO₃ was obtain by direct solution combustion method. Aggregated granular morphology of perovskite TbFeO₃ was confirmed. Magnetization of TbFeO₃ granules is in pronounced dependence of temperature. [ABSTRACT FROM AUTHOR]