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Praseodymium(III) molybdate crystallizes in the monoclinic crystal system, superspacegroupI2/b(αβ0)00, cell parameters a = 0.530284 nm, b = 0.532699 nm, c = 1.17935 nm and β = 90.163°. Several phase transitions occur in crystals at temperatures of 235 and 987 °C.