Density of Melts of the System KF—K2MoO4—SiO2

Chrenková, M., Boča, M., Kuchárik, M. and Daněk, V. Density of Melts of the System KF—K2MoO4—SiO2 Chemical Papers, Vol.56, No. 5, 2002, 283-287

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
 
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Author(s) Chrenková, M.
Boča, M.
Kuchárik, M.
Daněk, V.
Title Density of Melts of the System KF—K2MoO4—SiO2
Journal name Chemical Papers
Publication date 2002
Year available 2002
Volume number 56
Issue number 5
ISSN 0366-6352
Start page 283
End page 287
Place of publication Poland
Publisher Versita
Collection year 2002
Language english
Subject 250000 Chemical Sciences
250200 Inorganic Chemistry
Abstract/Summary The density of the melts of the system KF—K2MoO4—SiO2 was measured using the Archimedean method. On the basis of the obtained density data the molar volume, partial molar volume, and excess molar volume of the melts were calculated in order to consider the possible chemical interactions of components. In the system KF—K2MoO4 the density increases monotonically with increasing content of K2MoO4. The formation of the additive compound K3FMoO4 causes only small positive deviations from the ideal behaviour. In the system KF—SiO2 the density increases with increasing content of SiO2. The partial molar volume of SiO2 in the melt is a little higher than that of the pure SiO2, which may refer to some weak chemical interaction of both components leading to a small volume expansion. The density of the system K2MoO4—SiO2 increases with increasing content of SiO2. The partial molar volume of SiO2 in the infinitely diluted solution, V SiO2 = 3.65 cm3 mol−1, may refer to a strong chemical interaction of both components accompanied by a substantial volume contraction. Two different regions are present in the investigated part of the system KF—K2MoO4—SiO2. In the region of low content of SiO2, near the figurative point of K3FMoO4, there is a region of volume expansion, while at higher SiO2 concentration a region of volume contraction is present. The volume expansion is caused by the formation of the additive compound K3FMoO4, while the volume contraction refers probably to the formation of the heteropolyanions [SiMo12O40]4−.
 
 
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