Syntheses of various rare earth phosphates from some rare earth compounds

Thermal evolution, second phases, and sintering behavior of LaPO4·nH2O nanorods prepared by two different chemical synthesis routes

“…The hydration of the LaPO 4 crystal is due to zeolitic water present in the channel-type structure. Different temperature values are given in the revised literature for the dehydration phenomena of the rhabdophane-type LaPO 4 •nH 2 O depending on the synthesis method employed [13,14,18,[38][39][40][41][42][43][44]. A 17% TGA weight loss and a sharp endothermic peak centered at $ 325 1C can be attributed to NO 2 emission, intermediate compound in the combustion reactions, which gives rise to the N 2 and O 2 gases [45].…”

“…Another endothermic peak at $ 490 1C can be attributed to rhabdophane to monazite phase transition, according to the XRD analysis (see below). There must be taken into account the shift of the temperatures for the different events between the DTA-TG and XRD results since the powders were calcined at each temperature for 12 h. The position of the exothermic peak corresponding to the hexagonal-monoclinic transition is observed at different temperatures from 375-900 1C [13,14,18,[38][39][40][41][42][43][44] also depending on the synthesis method employed. The broad exothermic peak centered at $ 900 1C can be assigned to further crystallization of the monazite phase, accompanied by the combustion of the organic material, i.e., thermal decomposition products of the urea, both elimination and nitrates decomposition, etc.…”

Synthesis and sintering of a monazite–brabantite solid solution ceramics using metaphosphate

“…In this scheme, calcium is used as a charge-balancing element for thorium. 29 Cerium Many publications [25][26][27][33][34][35][36][37][38][39][40] report various ways to synthesize such materials. In this work, we wanted to develop a high-temperature solid-state reaction (hydrous reactions would increase the risk of criticality because water is an efficient neutron moderator) with a limited gas production.…”

Thermal synthesis and characterization of AlχLa1-χ P3O9

“…Al 0.5 La 0.5 P 3 O 9 contents and second phase monazite LaPO 4 [10]. Table 1 illustrates the physical-chemical properties and pigment parameters of the prepared triphosphate: density (DIN ISO 787/10), oil absorption (DIN ISO 787/5), critical pigment volume concentration (CPVC linseedoil ) and particle size distribution.…”