Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer

Abstract

Gadolinium aluminate (GdAlO _3 , GAP) nano whiskers were synthesized by the hydrothermal-solid state method, Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and thermogravimetry-differential thermal analysis (TG-DTA) were employed to analyze the phase change and the nucleation mechanism of GAP during calcing process. The results show that the precursor of GAP prepared by hydrothermal is (NH _4 ) _x GdAl(OH) _y (NO _3 ) _z ·nH2O. When the calcination temperature is higher than 900 °C, the precursor recrystallizes, forming the needle shape GAP under the synergistic effect factors. The best preparation conditions are as follows: ammonia water as mineralizer, pH = 9, calcination temperature 1100 °C and holding time 3 h.

Keywords

• hydrothermal-solid state method
• perovskite
• gadolinium aluminate
• whisker
• XRD pattern