Strontium Molybdate, SrMoO₄

Strontium Molybdate, SrMoO₄, is prepared by fusing together sodium molybdate (1 part), strontium chloride (2 parts), and sodium chloride (2 parts). It crystallises in white quadratic pyramids, with axial ratio

a:c = 1:1.5738,

and of density 4.145 at 21° C. It is only slightly soluble in water, 1 part of the salt dissolving in 9600 parts of water.

Higher molybdates of strontium are not known with certainty. An octamolybdate, of composition SrMo₈O₂₅.7H₂O, has, however, been described. It is obtained as needle-shaped crystals by treating a solution of ammonium tetramolybdate with strontium chloride and allowing the mixture to evaporate.