A rapid method to obtain nanometric particles of rhabdophane LaPO4·nH2O by mechanical milling

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

“…In addition, the FTIR spectrum of the as-prepared and dried powders presents one peak at 810 cm À 1 which can be assigned to trioxophosphate groups (PO 3 1À ) related to La(PO 3 ) 3 [25]. That band has been also found by other authors and also assigned to the trioxophosphate group [26,27].…”

Microwave‐assisted Hydrothermal Synthesis of Single‐crystal Nanorods of Rhabdophane‐type Sr‐doped LaPO4·nH2O

“…31,32 Some of these previous studies have shown evidences that the nanowires/nanorods retained their morphology after calcination at 400°C-1000°C, 19,20,22,25,27 indicating that these nanowires/nanorods have high thermal stability; in this way, nanorods have been synthesized having 5-50 nm in diameter and 40 nm to several micrometers in length, and whose SSA varies from 7 to 127 m 2 /g. The preparation of nanorods of rhabdophane-type Sr-doped LaPO 4 ÁnH 2 O is less demonstrated, and indeed does not appear to be works reporting the synthesis of rhabdophane phase exclusively.…”

“…Indeed, it is well-known that the temperature of this phase transformation depends on the synthesis method and also on the Sr doping if sufficient Sr is added. 19 For example, different transformation temperatures have been reported for the methods of coprecipitation followed by conventional heating, 14 hydrothermal synthesis, 16 combustion synthesis, 33 and mechanical milling 19,25 ; in addition, it has been observed that the crystallization of powders obtained by planetary milling occurs in the rhabdophane phase, and also in the monazite phase if doped with Sr. 19 There must be also taken into account that different times during synthesis, not only the method employed and the temperature can influence the final product. 14,16,19,25,33 Finally, it is also noted in Fig.…”

Synthesis and study of anhydrous lanthanide orthophosphate (Ln = La, Pr, Nd, Sm) nanowhiskers

“…Lanthanide orthophosphates with these structures can be synthesized in the laboratory by different methods: a precipitation from the solutions, a sol-gel technique, a hydrothermal synthesis, a solid state reaction (ceramic method) [14], as well as by the application of microwave [10], sonochemical [11,12] and mechanical treatments (high-energy milling) [13].…”