Nd_3−xAE _xFe₅O₁₂: Hydrothermal synthesis, structure and magnetic properties

Abstract

Rare-earth ferrite garnet is one of the most important materials applied in microwave transducer and infrared magneto-optical devices, etc. Nd_3−xAE _xFe₅O₁₂(AE=Ca, Sr) crystals, which have cubic structure with the space group of Ia 3̅ d and lattice constants over 1.26 nm, were prepared via the mild hydrothermal method. The structural, morhpology and magnetic properties were characterized by means of powder X-ray diffraction, scanning electronic microscopy, as well as vibrating sample magnetometer and Mössbauer spectroscopy, respectively. Mössbauer spectroscopy demonstrates the coexistence of Sr²⁺, Ca²⁺ and Nd³⁺ at the C sites of the dodecahedrons for different substituted garnets. The crystal shape is dodecahedron, and the particle sizes are decreased with increasing the Ca and Sr doping concentrations. By recording the magnetic hysteresis loops and M-T curves at different temperatures, it can be seen that with the increasing x, the saturation magnetization values decrease while the coercive forces increase under the condition of high temperatures.

Keywords

Garnet structure / Magnetic property / Mössbauer spectrum

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