Gadolinium and lanthanum solubility limits in a sodium-alumino-borosilicate glass system were studied. As melting temperature increased from 1400 deg C to 1450 deg C, 1500 deg C and 1550 deg C, the solubility of gadolinium in the baseline glass 15B)2O_3-5Al_2O_3-20Na_2O-60SiG_2 (in molar composition) increased from 10.1 to 11.3, 12.2 and 13.1 (in mole percent of Gd_2O_3). The enthalpy change of Gd_2O_3 dissolution in this baseline glass is about 43.6 kJ/mol. Boron effect on lanthanum solubility was studied using the following baseline glasses: xB_2O_3-20Na_2O-5Al_2O_3-60SiO_2, where x equals to 5, 10, 15, and 20, respectively. It was found that lanthanum solubility limit increased from 8.4 to 10.3, 12.5 and 14.9 (in mole percent of La_2O_3) as B_2O_3 increased from 5.1 to 9.5, 13.1 and 16.2 mol
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