In this paper, LaxNd1-xPO4(x=0, 0.5, 0.8) series crystals with high Nd-concentration were grown through a seed-inducing method using Li2CO3-2MoO3 as a flux, and some factors influencing the quality of crystals were also discussed. The IR, absorption and fluorescence spectra of La0.5Nd0.5PO4 crystals at room temperature were measured. High temperature X-ray diffraction was conducted to investigate the thermal expansion behavior of NdPO4 crystals in the temperature range from 25°C to 900°C. Abnormal diffraction peaks shifts were observed along the (200) and (020) direction. The results indicate that as temperature increased, the crystal in the (200) and (020) direction contracted (from 25 °C to 700 °C) at first, and then expanded (from 700°C to 900°C). The mechanism responsible for the abnormal thermal expansion in NdPO4 was attributed to the existence of rigid unit modes (RUM).
Nd3PO7 was synthesized by solid state reaction techniques under high temperature in air atmosphere for the first time, the crystal phase of Nd3PO7 was investigated by X-ray powder diffraction and scanning electron microscopy, the results show that Nd3PO7 is monoclinic phase; the Nd: P: O = 3:1:7; Infrared spectroscopic study was used to obtain further structural information about the nature of bonding in Nd3PO7. Emission spectra of Nd3PO7 were investigated at room temperature using a fluorescence spectrometer in the visible portion of the spectrum. Excellent emission was observed at 441 nm when Nd3PO7 excited at 325 nm wavelength, which was assigned to the 4G11/2-4I9/2 transition of Nd3+ ions. All the investigated suggestions that Nd3PO7 is a good phosphor candidate applied in fluorescent materials.
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