The density and thermal expansion of a number of rare earth gallium ga
rnets were studied in the liquid and solid states in the regions of cr
ystallization and melting by irradiating the samples with a narrow bea
m of gamma quanta. Volume changes on liquid-solid and solid-solid tran
sitions were measured for equilibrium and nonequilibrium crystallizati
on. The formulas for the estimation of the thermal properties of the l
iquid rare earth gallium garnets remaining to be explored were obtaine
d.