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## Abstract This paper presents studies on the crystallisation of alkalineβearth metal tungstates by slow cooling of saturated solutions in sodium tungstate melts at 700 to 1000 Β°C. Solubilityβtemperature diagrams were prepared for this temperature range. The effects of variation in the initial cry
## In a Ixevious palx+, an ion-exchange mcthocl was described for the quantitative separation of the alkaline earths from each other. This p;ll>er presents the application of the ion-exchange separation to the determination of the alkaline earths in glass. Preliminary cxpcriments indicated that m
Quantitative structure-property relationships (QSPR) between the melting points of oligomethylenes and quantum chemical data calculated by the semiempirical method CNDO/ 2 were investigated. A linear relationship between the average net charges of hydrogen and carbon atoms in the molecules and the m