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Phase diagrams of Li_2moo_4-Na_2moo_4 and Na_2moo_4-k_2moo_4 systems

Rare Metals 2006年第4期25卷 316-320页

作者： DING Yimin HOU Na CHEN Nianyi XIA Yiben College of Sciences Shanghai University Shanghai 200444 China School of Materials Science and Engineering Shanghai University Shanghai 200072 China

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 systen＇ls. 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.

关键词： phase diagram DTA Li2moo4 Na2moo4 k2moo4

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Phase diagrams of Li_2moo_4-Na_2moo_4 and Na_2moo_4-k_2moo_4 systems

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北京科技大学学报 2006年第8期28卷 773-773页

作者： DING Yimin HOU Na CHEN Nianyi XIA Yiben College of Sciences Shanghai University Shanghai 200444 China School of Materials Science and Engineering Shanghai University Shanghai 200072 China

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.

关键词：相图 Li2moo4 Na2moo4 k2moo4 热分析

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维普期刊数据库

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