Influence of Calcining Temperature on the Microstructure of LaPO4 Powders
Nanometer LaPO4 powders were synthesized by liquid-liquid direct precipitation method. La(NO3)3•6H2O and (NH4)3PO4•3H2O were used as raw materials. The calcining temperature was 900°C, 1000°C, 1100°C, respectively. DTA result shows that the LaPO4 precursor is LaPO4•4H2O. The calicined powders were characterized by X-ray powder diffraction (XRD) and Scanning Electron Microscope (SEM), and exhibited a pure LaPO4 phase with a monazite structure about 50-100 nm in diameter size. With the calcining temperature increasing, the crystallization of the LaPO4 became better and the grain shape changed from elongated grain shape to spherical grain shape.
Yansheng Yin and Xin Wang
Z. F. Liu et al., "Influence of Calcining Temperature on the Microstructure of LaPO4 Powders", Advanced Materials Research, Vols. 79-82, pp. 2231-2234, 2009