Abstract
A hydrothermal method has been developed and shown to be effective for the preparation of Li1.075Nb0.625Ti0.45O3 (LNT) nano-particles. Hydrothermal reaction temperature was in the range from 120°C–200°C. The crystalline structure and morphology of the prepared particles have been characterized by x-ray diffraction and scanning electron microscopy. Results indicate that hydrothermal temperature had a great effect on the phase formation and morphology of the particles. The prepared powders crystallized at 140°C, and the pure LNT phase was formed at 180°C. The size of LNT particles increased with increasing reaction temperature, and plate-like LNT particles with thickness of 15–30 mm and a diameter of 80–200 mm were obtained at 200°C. It was found that LNT powders synthesized at 180°C gave the LNT ceramics the highest microwave dielectric properties (ɛr = 66, Q×f = 8946 GHz) due to good crystallization and low particle size.
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