Densities of Li 2O–B 2O 3 melts

Abstract

The densities have been systematically measured in xLi 2O–(1− x)B 2O 3 melts of different compositions with Li 2O content varying from x=0 to 0.68 from their respective melting points up to about 1450 K with a modified Archimedean method. The density decreased with increasing temperature for all the melts measured in this work. When x < 0.15 , the plot of temperature versus density could be well fitted by a quadratic polynomial function, and when x⩾0.15, density decreased linearly with increasing temperature. At a fixed temperature, the density of the melts increased rapidly with Li 2O content, went through a maximum at about x = 0.333 (Li 2O–2B 2O 3), and then decreased slowly as Li 2O content was further increased. In addition, the volume expansion coefficient ( β) was calculated based on the densities measured in this work, and it was found that a maximum value appeared in the dependence of β on the molar ratio of Li 2O at about x = 0.333 .