Crystallographic parameters for GdSr₂AlO₅ and optimal Gd_0.96Sr₂AlO₅:4 mol% Sm³⁺ nanophosphors.

Sample	GdSr2AlO5	Gd0.96Sr2AlO5:4 mol% Sm3+
Crystal system	Tetragonal	Tetragonal
Lattice symbol	I	I
Space group	I4/mcm	I4/mcm
Pearson symbol	tI	tI
Centro-symmetry	Centric	Centric
Formula unit (Z)	4	4
Space group number	140	140
α = β = γ	90.0000	90.0000
a (Å)	6.88630	6.89217
b (Å)	6.88630	6.89217
c (Å)	11.04070	11.07214
Volume (Å3)	523.562	525.948
R-factors	4.95, 6.78	5.20, 7.32
χ 2	2.22	2.61