Thermophysical properties of La2(Zr0.7Ce0.3)2O7 prepared by hydrothermal synthesis for nano-sized thermal bather coatings

Nano-sized lanthanum-zirconium-cerium composite oxide (La-2(Zr0.7Ce0.3)(2)O-7, LZ7C3) for potential TBCs (thermal barrier coatings) application was synthesized via a hydrothermal method. The crystal structures, morphologies, and sintering behaviors of the as-prepared powders and sintered ceramic bodies were investigated by X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and high resolution transmission electron microscopy. The XRD and Raman spectroscopy results indicate that LZ7C3 shows a pyrochlore-type structure throughout the sintering temperature from 1000 degrees C to 1500 degrees C. The relative density, volume shrinkage rate, thermal expansion coefficient, and thermal conductivity of LZ7C3 are also investigated and compared with La2Zr2O7 and 8YSZ. The results reveal that nano-sized LZ7C3 is potentially suitable for the application as a TBCs material. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.