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Chemical durability of the glass 0.8 LiF 0.2 Al(PO3)3 (designated below as LiF-80) was studied in water and in 0.01 mol dm-3 HCl solution (further 0.01 M). The experiments were carried out at 25, 40 and 60•Ž with glass discs in unstirred solutions, which have been refreshed daily during a month. The methods used were mass loss measurements and determination of Li, F, and P2O5 concentrations in the solutions. The mean velocities and the apparent activation energies of the glass dissolution were estimated. The time dependencies of mass losses and leaching of the components were apparently linear. The ratios Li F and Li / P2O5 in solutions tend to be twice in water and four times as large in HCl solution in comparison to such ratios in glass itself, i.e. the dissolution of the glass runs with a preferred leaching of Li +. Additions of 2 and 5 % CaO (over 100% by weight) increase slightly the chemical durability of the glass in unstirred 0.1 M HCl solution. In comparison with the glass LiF-80 the durability of the glass LiF-85 is much worse. Glasses of the system LiF Al2O3 P2O5 attract attention thanks to their high Li + ion conductivity 1 as solid electrolytes and material for selective Li + sensors (glass electrodes) in water solutions 2,3. However their chemical durability was not studied yet. EXPERIMENTAL The glasses have been synthesized in an electric oven for 30 min at 950-1000•Ž using glassy carbon crucibles at dry argon atmosphere. The reagents were LiF, Al(PO3)3 and CaCO3, chemical pure or pure for analysis grade. The specimens were glass discs 15 20 mm in diameter and 2-3 mm thick. They were obtained by moulding of glass melt in hot steel casts and then annealed. Their faces were polished (for details see 1). Areas of the samples were estimated; they were degreased with water and acetone. The weighed LiF-80 glass discs were hanged in 70 cm 3 of distilled water or 0.01 M HCl in polyethylene or Teflon beakers with lids. The

CHEMICAL DURABILITY OF THE GLASSES OF SYSTEM LiF-CaO-Al(PO<SUB>3</SUB>)<SUB>3</SUB>