A novel Co-ions complexation method to synthesize pyrochlore La(2)Zr(2)O7

摘要

Pure pyrochlore Lanthanum zirconate (LZ) was synthesized by co-ions complexation method (CCM) at 1300 degrees C, which is 300 degrees C lower than that by solid-state method (SSM). At 1450 degrees C, the 12 prepared by CCM possessed lower thermal conductivity (1.15 W/m K) than that obtained by SSM (1.99 W/m K). This significant decrease may be caused by the different grain size, which is 300 nm and 2.5 mu m synthesized by CCM and SSM, respectively. 12 precursor was belt-shaped and the belt shorten and the grain grown with the temperature increasing. Fourier transform infrared spectroscopy suggested the solidification in CCM forms from the complexation between La3+, Zr4+ and (CHCOO-)-C-3, which is the key for solidification. Compared to SSM, CCM is a lower temperature and simpler technology to synthesize nano-size 12 and other rare-earth oxides.(C) 2017 Elsevier Ltd. All rights reserved.