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The crystal structure of silicate oxyapatite Ca2Y8Si6O26 was indexed as hexagonal,space group P63/m,a=0.93515 nm,c=0.67872 nm,α=β=90°,γ=120°,V=0.5138692 nm3.Three strong peaks located at 32.079o,32.595o,and 50.104o with d=2.7903,2.74649,1.8194 was in accordance with,(112),and(213) planes.The optimum concentration of Tb3+ in Ca2Y8Si6O26 to yield highest photoluminescence intensity was 10 mol.% of Y3+.The corresponding excitation spectrum consisted of an intense broad band from 220 to 260 nm.The photoluminescence measurements showed that the green emission originated from 5D4-7F5 was predominant in the measured range with strong doublet lines at 543 and 549 nm.
The crystal structure of silicate oxyapatite Ca2Y8Si6O26 was indexed as hexagonal, space group P63 / m, a = 0.93515 nm, c = 0.67872 nm, α = β = 90 °, γ = 120 °, V = 0.5138692 nm3.Three strong peaks located at 32.079o, 32.595o, and 50.104o with d = 2.7903, 2.74649, 1.8194 was in accordance with (112), and (213) planes. The optimum concentration of Tb3 + in Ca2Y8Si6O26 to yield the highest photoluminescence intensity was 10 mol.% Of The corresponding excitation spectrum consisted of an intense broad band from 220 to 260 nm. The photoluminescence measurements showed that the green emission originated from 5D4-7F5 was predominant in the measured range with strong doublet lines at 543 and 549 nm.