Investigation of the Alkaline Earth Phosphates: Crystal Structure of a New Strontium Hydrogen Phosphate Form

Extended solubility of Sr in LaPO4 monazite

“…[ 18 ] While it is tempting to think that a solid solution could exist from x = 0 to x = 1, the -SrHPO4 crystal structure is orthorhombic while LaPO4 is monoclinic. Thus it cannot be expected that a continuous solid solution exists between SrPO3(OH) and LaPO4.…”