Abstract
A new environmentally friendly strategy for the synthesis of β-(NH4)2Mo4O13 powders is presented using a direct “reducing ammonium” in situ transformation method from (NH4)2Mo2O7. The crystal structure of the resulting β-(NH4)2Mo4O13 was first characterized using X-ray diffraction analysis. The title compound crystallizes in a triclinic system, space Group P-1(2), a = 8.250 Å, b = 8.331 Å, c = 10.240 Å, α = 104.686°, β = 106.077°, γ = 109.614°, Z = 2. The TG-DTA results showed that no intermediate products were generated in the thermal decomposition process from β-(NH4)2Mo4O13 to MoO3. A comprehensive study of the newly synthesized β-(NH4)2Mo4O13 was performed by FESEM, FTIR spectroscopy and Raman spectroscopy. The band gap energy of the synthesized β-(NH4)2Mo4O13 was 3.26 eV, which shows a good intense absorption band in the visible light region.
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