Density measurement of glass and liquid CaAl2O4 using a pressurized electrostatic levitator

A pressurized electrostatic levitation furnace (PESLF) was used to measure the density of calcium aluminate with a composition of CaAl2O4 (CA) over a wide temperature range of 673-2300 K with an ultraviolet-based imaging technique. The density was measured in various gas atmospheres of O-2, air and N-2 at a chamber pressure of 4 x 10(5) Pa. The measurements under these different atmospheres suggested that the density increased when decreasing the oxygen atmosphere. The density obtained under N-2, air and O-2 gas atmosphere can be expressed as rho(T) N-2 = 2.91 x 10(3)-0.073(T-T-m), rho(T) air = 2.76 x 10(3)-0.075(T-T-m) and rho(T) O-2 = 2.70 x 10(3)-0.1(T-T-m) (kg m(-3)) (+/- 2%) with T-m = 1878 K, over the range 2200 to 673 K.