?? ???? ??? ??????????? ??? ????? ?? ?? ?????? ?? ?????? ???? ??? ?? ?? P2O5 ?? ??? ????????? ??????????? ????? ?? ?? ?????? ?????? ???? ??, ?????? ???? ???????? ????????? ?? ?? ????? ??????? ?????? ???? ??, ?????? ??????? ???? SiO2 73.0, B2O3 11.70, Al2O3 3.30, P2O5 1.30, Na2O (9.6-(X+Y)), CaO (X=0.1-050) ?? BaO (Y=4.5-2.9)wt% ??? ???? ??? ?????? Na2O, CaO ?? BaO ?? ???????? ?? ??????, ???? ?? ??? ????????, ?? ??????? ??? ??? ???? ?? ??? ???????? ?? ????? ??? ????? ?? Na2O/ BaO + CaO ?? ????? ?????? ?? ?????? ??
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