Thermochemistry of sodium uranomolybdates formed in the system Na2O-UO3-MoO3

Sodium uranomolybdates Na 2 U 3 Mo 9 O 37 , Na 4 U 3 Mo 2 O 17 , Na 2 U 3 Mo 4 O 22 , Na 6 UMo 4 O 18 , and Na 6 U 2 Mo 4 O 21 were synthesized and studied by reaction calorimetry. The enthalpies of their formation were calculated from the calorimetric data.