Phosphate and borate glasses with high elastic moduli

A glass comprising a plurality of components, the glass having a composition of the components comprising:

• greater than or equal to 40.0 mol. % and less than or equal to 75.0 mol. % P2O5,
• greater than or equal to 3.0 mol. % and less than or equal to 30.0 mol. % Al2O3,
• greater than or equal to 0.0 mol. % and less than or equal to 20.0 mol. % Li2O,
• greater than or equal to 0.0 mol. % and less than or equal to 15.0 mol. % ZnO,
• greater than or equal to 0.0 mol. % and less than or equal to 15.0 mol. % B2O3,
• greater than or equal to 0.0 mol. % and less than or equal to 1.0 mol. % SiO2,
• greater than or equal to 0.0 mol. % and less than or equal to 20.0 mol. % RO,
• greater than or equal to 0.0 at. % and less than or equal to 1.0 at. % F,
• greater than or equal to 0.5 mol. % and less than or equal to 20.0 mol. % TiO2+La2O3+Y2O3+Ce2O3+CeO2+ZrO2,
• greater than or equal to 0.5 mol. % R2O+RO+B2O3,
• greater than or equal to 0.0 mol. % and less than or equal to 28.0 mol. % R2O+RO and
• optionally comprising one or more components selected from MnO2, Nb2O5, SnO2, Ta2O5, WO3, SC2O3, Pr2O3, PrO2, Pr6O11, Nd2O3, Eu2O3, EuO, Gd2O3, GdO2, Tb2O3, Dy2O3, HO2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3 and Sm2O3,
• wherein the composition of the components is
• substantially free of Cu, Co, Cr and Ni,
• wherein none of the ranges of the components is modified by the term “about”;
• and
• and wherein the glass satisfies the conditions:
• PE>75,
• where
• PE is calculated from the glass composition in terms of mol. % of the components according to the Formula (II):
• PE=−0.27146*P2O5+0.96062*Al2O3+0.22431*B2O3−0.072878*BaO+0.35074*CaO+0.21526*(Ce2O3+CeO2)−0.12628*Cu2O−0.5807*K2O+0.41579*La2O3+0.18714*Li2O+0.20336*MgO+0.061862*MnO−0.057105*MnO2−0.18615*Na2O+0.64778*Nb2O5−0.35317*PbO−0.028357*SiO2+0.17429*SnO+0.55551*SnO2+0.8294*Ta2O5+0.60217*TiO2+0.17356*WO3+0.36256*Y2O3−0.19958*ZnO+0.7835*ZrO2+0.46259*(REmOn−La2O3−Y2O3−Ce2O3−CeO2)+0.90549*(max(0,min(B2O3,P2O5−(3*Al2O3+3*REmOn+R2O+MgO+CaO))))+70, (II)
• where RO is a total sum of divalent metal oxides and R2O is a total sum of monovalent metal oxides;
• and
• wherein the value of the parameter PE is modified by the term “about”.