Abstract
Ln 2Mo 3O 12 and Ce 2Mo 3O 12.25 are reduced by hydrogen yielding Mo 4+ oxides of the formula Ln 2Mo 3O 9 (Ln = La, Ce, Pr, Nd, Sm, Gd and Dy). The new compound Ce 2Mo 3O 9 has the same structure as other Ln 2Mo 3O 9 compounds. All of the products are single phase materials and crystallize in a tetragonal scheelite type structure with Mo 2O 6 clusters. The IR spectra of the Ln 2Mo 3O 9 oxides show two absorption bands. These compounds are black n-type semiconductors and exhibit Curie-Weiss Law behavior from 100K to 250K. Temperature dependence of the electrical properties of these compounds were measured for the first time, and a semiconductor-metal transition was found at about 250 °C.
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