Synthesis of Ba-Mo-O and Sr-Mo-O Ternary Compounds for Thermodynamic Study

Abstract

The production of a number of compounds (i.e., BaMo₃O₁₀, BaMo₄O₁₃, Ba₂MoO₅, Ba₂Mo₅O₁₇, Ba₃MoO₆, Ba₃Mo₇O₂₄, SrMo₅O₈, Sr₂MoO₄, Sr₃MoO₆, and Sr₃Mo₂O₇) in the barium-molybdenum-oxygen and strontium-molybdenum-oxygen systems are required for further thermodynamic study for contribution towards the Thermodynamics of Advanced Fuels - International Database (TAF-ID) project. A procedure was used to hold mixed powdered pellet samples at high temperatures to perform a solid-state synthesis of the desired compounds. The results were characterized using X-ray diffraction techniques and Energy Dispersive X-ray techniques to quantify the amounts of each of the compounds in the sample. The production of six of the compounds have been attempted (i.e., BaMo₃O₁₀, BaMo₄O₁₃, Ba₂MoO₅, Ba₃MoO₆, Sr₂MoO₄, and Sr₃MoO₆),four of which have produced high quantities of the compounds (i.e., BaMo₃O₁₀, Ba₂MoO₅, Ba₃MoO₆, and Sr₃MoO₆). The procedure has had limited success in producing the more complex compounds. Alternate methods, or modifications to the current one, are required in order to produce the remainder of the compounds needed for study.