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

Extended solubility of Sr in LaPO4 monazite

“…[10] Therefore, divalent (Ca 2+ , Sr 2+ )-doped LaPO4 has been investigated as a prospective protonic conductive material. [11][12][13] Interestingly, the published research reports widely varying Sr substitutional concentrations [11,[14][15][16][17] which may be due to different (OH) -content.…”

Chemical durability and leaching mechanism of Ce0.5Eu0.5PO4 ceramics: Effects of temperature and pH values

“…At industrial scale vitrification is the reference route selected by many countries. In parallel, monazite, monoclinic system and space group P2 1 /n, has been suggested as a potential minor actinides waste form due to high actinides loadings and radioresistance [3,5,[7][8][9][10][11][12][13][14][15][16][17].…”

“…In previous study, the solid solution of monazite-type CePO 4 doped with Eu was successfully prepared using the solid state method [1]. At present, the studies on the synthesis, thermal and mechanical properties, chemical durability of monazite ceramics containing various actinides or lanthanides (used as surrogates of actinides) are extensively carried out in the field of monazite ceramic waste-forms [7][8][9][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. These monazite ceramic waste-forms were generally sintered by conventional pressureless sintering (PLS) process.…”

Comparison of microstructure and chemical durability of Ce0.9Gd0.1PO4 ceramics prepared by hot-press and pressureless sintering

“…Because of the low solubility and slow dissolution rates, these phosphates exhibit higher resistance against corrosion by the geological fluids than the borosilicate glass [1,2]. Monazite (Ln 3 þ PO 4 , monoclinic system, space group P2 1 /n, Z=4) is a natural light rare-earth orthophosphate mineral, which shows high actinides loadings, mechanical stability, chemical durability and radioresistance [11][12][13][14][15][16][17][18][19][20][21]. Moreover, monazite can incorporate trivalent and/or tetravalent actinides due to its high-structural flexibility [13][14][15][16][22][23][24][25].…”