Phase Diagram of the Vanadium Pentoxide–Borax System

Abstract

As reported previously¹, investigations have been carried out on the vanadium pentoxide–borax system. Differential thermal analysis constituted the first part of the investigations. These measurements were made with a special device for differential thermal analysis². The samples were prepared from chemicals of analytical grade. The temperature and the rate of melting of the mixtures were chosen so as to attain complete clarification. The gases formed during the melting procedure were tested by a method described in a previous paper³, but, apart from the crystal water liberated, no other gas; thus no oxygen was detected, proving that during the melting process, no liberation of the latter had taken place. The samples prepared were worked in the manner described elsewhere⁴.