Provided is optical glass in which an amount of P.sub.2O.sub.5 is 10.0 to 40.0 mass %, an amount of TiO.sub.2 is 5.0 to 40.0 mass %, an amount of Nb.sub.2O.sub.5 is 20.0 to 60.0 mass %, an amount of K.sub.2O is 0.01 mass % or more, a total amount of Li.sub.2O, Na.sub.2O, K.sub.2O, MgO, CaO, ZnO, SrO, and BaO [Li.sub.2O+Na.sub.2O+K.sub.2O+MgO+CaO+ZnO+SrO+BaO] is 20.0 mass % or less, a total amount of TiO.sub.2 and Nb.sub.2O.sub.5[TiO.sub.2+Nb.sub.2O.sub.5] is 55.0 mass % or more, a mass ratio [K.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O)] between the amount of K.sub.2O, and a total amount of Li.sub.2O, Na.sub.2O, and K.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O] is 0.5 or more, a mass ratio [(MgO+CaO+ZnO+SrO+BaO)/(Li.sub.2O+Na.sub.2O+K.sub.2O)] between a total amount of MgO, CaO, ZnO, SrO, and BaO [MgO+CaO+ZnO+SrO+BaO], and the total amount of Li.sub.2O, Na.sub.2O, and K.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O] is 0.30 to 10.0, a mass ratio [TiO.sub.2/K.sub.2O] between the amount of TiO.sub.2 and the amount of K.sub.2O is 3.0 or more, and a mass ratio [(Li.sub.2O+Na.sub.2O+MgO+CaO+ZnO+SrO)/(K.sub.2O+BaO)] between a total amount of Li.sub.2O, Na.sub.2O, MgO, CaO, ZnO, and SrO [Li.sub.2O+Na.sub.2O+MgO+CaO+ZnO+SrO], and a total amount of K.sub.2O and BaO [K.sub.2O+BaO] is 0.8 or less.

Provided is optical glass in which an amount of P.sub.2O.sub.5 is 10.0 to 40.0 mass %, an amount of TiO.sub.2 is 5.0 to 40.0 mass %, an amount of Nb.sub.2O.sub.5 is 20.0 to 60.0 mass %, an amount of K.sub.2O is 0.01 mass % or more, a total amount of Li.sub.2O, Na.sub.2O, K.sub.2O, MgO, CaO, ZnO, SrO, and BaO [Li.sub.2O+Na.sub.2O+K.sub.2O+MgO+CaO+ZnO+SrO+BaO] is 20.0 mass % or less, a total amount of TiO.sub.2 and Nb.sub.2O.sub.5[TiO.sub.2+Nb.sub.2O.sub.5] is 55.0 mass % or more, a mass ratio [K.sub.2O/(Li.sub.2O+Na.sub.2O+K.sub.2O)] between the amount of K.sub.2O, and a total amount of Li.sub.2O, Na.sub.2O, and K.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O] is 0.5 or more, a mass ratio [(MgO+CaO+ZnO+SrO+BaO)/(Li.sub.2O+Na.sub.2O+K.sub.2O)] between a total amount of MgO, CaO, ZnO, SrO, and BaO [MgO+CaO+ZnO+SrO+BaO], and the total amount of Li.sub.2O, Na.sub.2O, and K.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O] is 0.30 to 10.0, a mass ratio [TiO.sub.2/K.sub.2O] between the amount of TiO.sub.2 and the amount of K.sub.2O is 3.0 or more, and a mass ratio [(Li.sub.2O+Na.sub.2O+MgO+CaO+ZnO+SrO)/(K.sub.2O+BaO)] between a total amount of Li.sub.2O, Na.sub.2O, MgO, CaO, ZnO, and SrO [Li.sub.2O+Na.sub.2O+MgO+CaO+ZnO+SrO], and a total amount of K.sub.2O and BaO [K.sub.2O+BaO] is 0.8 or less.

Provided is optical glass in which a refractive index nd is 1.950 or more, an amount of P.sub.2O.sub.5 is 10.0 to 40.0 mass %, an amount of TiO.sub.2 is 5.0 to 40.0 mass %, an amount of Nb.sub.2O.sub.5 is 20.0 to 60.0 mass %, an amount of Bi.sub.2O.sub.3 is 20.0 mass % or less, a total amount of Al.sub.2O.sub.3 and SiO.sub.2 [Al.sub.2O.sub.3+SiO.sub.2] is 2.0 mass % or less, a total amount of Li.sub.2O, Na.sub.2O, and K.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O] is 5.0 mass % or less, and a total amount of ZnO, SrO, and BaO [ZnO+SrO+BaO] is 0.01 to 12.0 mass %.

Provided is optical glass in which a refractive index nd is 1.950 or more, an amount of P.sub.2O.sub.5 is 10.0 to 40.0 mass %, an amount of TiO.sub.2 is 5.0 to 40.0 mass %, an amount of Nb.sub.2O.sub.5 is 20.0 to 60.0 mass %, an amount of Bi.sub.2O.sub.3 is 20.0 mass % or less, a total amount of Al.sub.2O.sub.3 and SiO.sub.2 [Al.sub.2O.sub.3+SiO.sub.2] is 2.0 mass % or less, a total amount of Li.sub.2O, Na.sub.2O, and K.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O] is 5.0 mass % or less, and a total amount of ZnO, SrO, and BaO [ZnO+SrO+BaO] is 0.01 to 12.0 mass %.

The invention discloses porous, bioactive glass and glass ceramic morsels or pellets to be used as tissue graft substitute materials and processes for obtaining the same wherein the bioactive glass and glass ceramic morsels or pellets are made up of natural agents like phosphate, calcium, sodium and other elements which are not alien to the human or animal body. The said preparation process encompasses various steps like quenching sintering, foaming, and sol-gel casting which render the glass morsels or pellets unique bioactivity and enhanced porosity which may facilitate tissue repair and augmentation during tissue graft replacement.

The invention discloses porous, bioactive glass and glass ceramic morsels or pellets to be used as tissue graft substitute materials and processes for obtaining the same wherein the bioactive glass and glass ceramic morsels or pellets are made up of natural agents like phosphate, calcium, sodium and other elements which are not alien to the human or animal body. The said preparation process encompasses various steps like quenching sintering, foaming, and sol-gel casting which render the glass morsels or pellets unique bioactivity and enhanced porosity which may facilitate tissue repair and augmentation during tissue graft replacement.

An optical glass contains: a P.sub.2O.sub.5 component of 30 to 60 mass % (exclusive of 30); an Al.sub.2O.sub.3 component of 2 to 10 mass % (exclusive of 2); a TiO.sub.2 component of 10 to 36 mass % (exclusive of 36); an Nb.sub.2O.sub.5 component of 0 to 5 mass %; a Ta.sub.2O.sub.5 component of 0 to 15 mass %; a Bi.sub.2O.sub.3 component of 0 to 5 mass % (exclusive of 5); and an Sb.sub.2O.sub.3 component of 0 to 1 mass %; and a BaO component of 1 to 20 mass %.

An optical glass contains: a P.sub.2O.sub.5 component of 30 to 60 mass % (exclusive of 30); an Al.sub.2O.sub.3 component of 2 to 10 mass % (exclusive of 2); a TiO.sub.2 component of 10 to 36 mass % (exclusive of 36); an Nb.sub.2O.sub.5 component of 0 to 5 mass %; a Ta.sub.2O.sub.5 component of 0 to 15 mass %; a Bi.sub.2O.sub.3 component of 0 to 5 mass % (exclusive of 5); and an Sb.sub.2O.sub.3 component of 0 to 1 mass %; and a BaO component of 1 to 20 mass %.

A glass composition includes, as main content components, by mass %, a TeO.sub.2 content percentage of 50% to 80%, a Bi.sub.2O.sub.3 content percentage of 0% to 30%, a WO.sub.3 content percentage of 0% to 30%, a ZnO content percentage of 0% to 30%, a BaO content percentage of 0% to 30%, a GeO.sub.2 content percentage of 0% to 30%, and a Ga.sub.2O.sub.3 content percentage of 0% to 30%, wherein at least any one of additive target elements is introduced, the additive target elements including, Si.sup.4+ of 1 mg/kg to 1,500 mg/kg, B.sup.3+ of 1 mg/kg to 1,500 mg/kg, P.sup.5+ of 1 mg/kg to 1,500 mg/kg, Li.sup.+ of 1 mg/kg to 1,500 mg/kg, Na.sup.+ of 1 mg/kg to 1,500 mg/kg, K.sup.+ of 1 mg/kg to 1,500 mg/kg, Mg.sup.2+ of 1 mg/kg to 1,500 mg/kg, Ca.sup.2+ of 1 mg/kg to 1,500 mg/kg, Al.sup.3+ of 1 mg/kg to 1,500 mg/kg, and Sr.sup.2+ of 1 mg/kg to 1,500 mg/kg.

A glass composition includes, as main content components, by mass %, a TeO.sub.2 content percentage of 50% to 80%, a Bi.sub.2O.sub.3 content percentage of 0% to 30%, a WO.sub.3 content percentage of 0% to 30%, a ZnO content percentage of 0% to 30%, a BaO content percentage of 0% to 30%, a GeO.sub.2 content percentage of 0% to 30%, and a Ga.sub.2O.sub.3 content percentage of 0% to 30%, wherein at least any one of additive target elements is introduced, the additive target elements including, Si.sup.4+ of 1 mg/kg to 1,500 mg/kg, B.sup.3+ of 1 mg/kg to 1,500 mg/kg, P.sup.5+ of 1 mg/kg to 1,500 mg/kg, Li.sup.+ of 1 mg/kg to 1,500 mg/kg, Na.sup.+ of 1 mg/kg to 1,500 mg/kg, K.sup.+ of 1 mg/kg to 1,500 mg/kg, Mg.sup.2+ of 1 mg/kg to 1,500 mg/kg, Ca.sup.2+ of 1 mg/kg to 1,500 mg/kg, Al.sup.3+ of 1 mg/kg to 1,500 mg/kg, and Sr.sup.2+ of 1 mg/kg to 1,500 mg/kg.