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Sol–gel synthesis and characterization of lead-free LNKN nanocrystalline powder

2008; Elsevier BV; Volume: 310; Issue: 22 Linguagem: Inglês

10.1016/j.jcrysgro.2008.08.042

1873-5002

Chao Wang, Yudong Hou, Haiyan Ge, Mankang Zhu, Hao Wang, Hui Yan,

Dielectric materials and actuators

A kind of lead-free nanocrystalline powder, (Li0.06Na0.47K0.47)NbO3 (LNKN), has been prepared by a newly developed sol–gel method using Nb2O5 as the Nb source. Phase analysis, microstructure and morphology of the powder were determined by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman, transmission electron microscope (TEM) and high-resolution transmission electron microscopy (HRTEM). The experimental results showed that pure perovskite phase was formed at the temperature as low as 500 °C. Besides, the obtained powder belonged to tetragonal symmetry, and the mean particle size was as small as 20 nm. It is believed that the high-quality gel precursor and low processing temperature play a key role in the formation of the LNKN nano-particles. The process developed in this work was convenient to realize the mass production of LNKN nano-powders at low cost.