Modified Pechini synthesis of La, Ce, and Pr orthophosphates and characterization of obtained powders

Mutifuntional GdPO4:Eu3+ Hollow Spheres: Synthesis and Magnetic and Luminescent Properties

“…The first 3.3 wt % loss was observed below 120 °C followed by a further 7.8 wt % between 240 and 630 °C. These two courses have already been observed and interpreted as the evaporation of moisture present on the material’s surface (the first of the processes), followed by the release of zeolitically bound water (at the higher temperature). − Therefore, the second weight losses can be assigned to the dehydration of the hexagonal form of lanthanum orthophosphate, which indicates that the obtained phosphate hydrate should be GdPO 4 ·H 2 O. According to the revised literature, − different temperature values in the range of 375 to 900 °C are given for the rhabdophane-type LaPO 4 · n H 2 O (hexagonal) to monazite-type LaPO 4 (monoclinic) phase transition.…”