Phase diagrams of Li_2MoO_4-Na_2MoO_4 and Na_2MoO_4-K_2MoO_4 systems

摘要

The phase diagrams of the Li_2MoO_4-Na_2MoO_4 and Na_2MoO_4-K_2MoO_4 systems have been reassessed using differential thermal analysis together with high-temperature and room-temperature X-ray diffraction analysis. The results showed that the compound Li_2MoO_4-6Na_2MoO_4 did not exist; however, it confirmed the existence of the compound Li_2MoO_4-3Na_2MoO_4 in the Li_2MoO_4-Na_2MoO_4 systems. With regard to the system of Na_2MoO_4-K_2MoO_4, we could not confirm the results reported by Bukhanova who claimed that the system was eutectic type with 1:1 and 1:2 intermediate compounds, refuting the statement of Amadori who thought there was an apparent phase boundary at high temperature in alpha -solid solution region of the Na_2MoP_4-K_2MoO_4 binary system. The revised phase diagrams of these systems are illustrated in this article. These experimental results are in agreement with the computerized prediction using the support vector ma-chine-atomic'parameter method for the assessment of phase diagrams.