Phase diagrams of Li_2MoO_4-Na_2MoO_4 and Na_2MoO_4-K_2MoO_4 systems

The phase diagrams of the Li2MoO4-Na2MoO4 and Na2MoO4-K2MoO4 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 Li2MoO4·6Na2MoO4 did not exist; however,it confirmed the existence of the compound Li2MoO4·3Na2MoO4 in the Li2MoO4-Na2MoO4 systems. With regard to the system of Na2MoO4-K2MoO4,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 α-solid solution region of the Na2MoO4-K2MoO4 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 machine-atomic parameter method for the assessment of phase diagrams.

The phase diagrams of the Li2MoO4-Na2MoO4 and Na2MoO4-K2MoO4 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 Li2MoO4·6Na2MoO4 did not exist; however, it confirmed the existence of the compound Li2MoO4· 3Na2MoO4 in the Li2MoO4-Na2MoO4 systems. With regard to the system of Na2MoO4-K2MoO4, 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 α-solid solution region of the Na2MoO4-K2MoO4 binary system.