A Study of Phase Equilibria in the Potassium Borate System:
Glass Crystallization and Solid State Reaction

I. G. Polyakova and E. V. Tokareva

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Received January 13, 1997

Abstract—An investigation is undertaken of the potassium borate system in the composition range
850mol % K₂O. The phase diagram for the system is substantially revised, and the data on X-ray powder
diffraction analysis of the K₂O · 3B₂O₃ and 5K₂O · 19B₂O₃ compounds are refined. It is elucidated how the
dispersity affects the phase equilibria in the system. It is demonstrated that the phase diagram is constructed
more correctly when the crystalline phases with high surface energy are produced by the glass crystallization,
because the use of solid state reaction can lead to considerable errors in the diagram.

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.