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FTIR光谱、X射线和DTA法研究R_2O_3∶3Ga_2O_3∶4B_2O_3(R=La~(3+),Y~(3+),Yb~(3+))系的固态反应hisresearchwassupportedbytheNationalScienceResearchFoundationOTKA ,Hungary(GrantNosT 0 2 2 85 9,T 0 2 40 91andbytheMinistryofE