Preparation of LaPO4 Nanoparticles by Coprecipitation Method

Dong, Honggang; Shuang, Yingchai; Sun, Qinghong; Ren, Qingyun; Ma, Wen

doi:10.1007/978-981-13-0110-0_71

Cited by 4 publications

(2 citation statements)

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“…The crystallinity of monazite-type LaPO 4 has been shown to increase as the annealing temperature was increased from 400 to 1100 °C when LaPO 4 was made by the coprecipitation method . This was due to no significant grain growth taking place up to a temperature of 600 °C . There was minimal effect on the long-range order of LaPO 4 (Figure ) or local chemical environment of La (Figure ), P (Figure ), and Si (Figure ) regardless of annealing temperature.…”

Section: Discussionmentioning

confidence: 99%

“…The glass is a liquid at 1100 °C, which would aid in the diffusion of La 3+ and PO 4 3– . , However, at 700 °C, the annealing temperature is below the melting point of borosilicate glass, and so the ions would have less mobility. The crystallinity of monazite-type LaPO 4 has been shown to increase as the annealing temperature was increased from 400 to 1100 °C when LaPO 4 was made by the coprecipitation method . This was due to no significant grain growth taking place up to a temperature of 600 °C .…”

Section: Discussionmentioning

confidence: 99%

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Crystallization of Rare-Earth Phosphate-Borosilicate Glass Composites Synthesized by a One-Step Coprecipitation Method

Donato

Grosvenor

2020

Crystal Growth & Design

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Glass-ceramic composites are heterogeneous materials that have been suggested for use as nuclear waste form materials. A one-step coprecipitation method for synthesizing rare-earth phosphates (REPO4; RE = La or Ce) dispersed in a borosilicate glass (BG) matrix was investigated in this study. The effect of annealing temperature, ceramic loading, and oxidation state of the rare-earth precursor was explored using powder X-ray diffraction, scanning electron microscopy/energy dispersive X-ray spectroscopy, and X-ray absorption near-edge spectroscopy. REPO4 crystallites adopting the monazite structure were observed to form when the annealing temperature was 800–1100 °C in all REPO4–BG composite materials. Lowering the annealing temperature to 700 °C in the LaPO4–BG composite materials caused nm sized LaPO4 crystallites and crystalline SiO2 to form. No changes in the local chemical environment of La or P was observed as a result of the smaller LaPO4 crystallites. CeO2, crystalline SiO2, and Na3Ce(PO4)2 formed in CePO4–BG composite materials in addition to CePO4 when the annealing temperature was below 1100 °C. CePO4 was not observed to form in CePO4–BG composite materials at low ceramic loadings and when annealed at 700 °C. CePO4 was found to be the favored crystal phase over CeO2 and Na3Ce(PO4)2 in the CePO4–BG composite materials when the annealing temperature and ceramic loading was increased. The amount of CePO4 present was also found to be dependent on the oxidation state of the Ce precursor.

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Section: Discussionmentioning

confidence: 99%