Influence of addition of urea and its related compounds on formation of various neodymium and cerium phosphates

Microstructural and electrical features of lithium Ce-monazite

“…Of special interest are the bands observed at 530, 960 and 1070 cm − 1 in the samples sintered at high temperature. Which may be due to CeP 2 O 7 [20]. The corresponding band associated to CeO 2 at about 712 cm − 1 can be identified in the r-LiPhCe sintered at 1250°C.…”

Temperature dependence on addition of urea and its related compounds on formation of neodymium condensed phosphates

“…Samples without urea heated at 550 and 700°C had IR absorption peaks due to Monazite-type NdPO 4 (Fig. 4(d) and (e)) [11,25,26]. Sample added with urea heated at 550°C had IR absorption peaks of Monazite-type NdPO 4 (Fig.…”

“…The addition of urea or biuret greatly had the influence on synthesis and specific surface area of Rhabdophanetype neodymium and cerium phosphates. Furthermore, the influence of the addition of urea, biuret, and cyanuric acid was studied on the formation of Monazite-type rare earth orthophosphates, polyphosphate, and ultraphosphate [25]. The addition of urea promoted the dehydration-condensation reaction of phosphates.…”

Effect of the phosphorous/cerium ratio in the properties of sintered Ce-monazite

“…The microstructure and the optical properties depend on the synthesis pathways and the raw compounds used in the soft chemistry route [9][10][11]. Indeed, specific routes can lead to materials with different morphology and so, the sintered bodies in the orthophosphates severely varied on the ratio of phosphorous/cation.…”