Table 2.

Calculated crystallite size (D) values and degree of crystallinity (χ_c) of pure HAp and terbium-doped hydroxyapatite with various concentrations.

Samples	D/nm	S/%	χc/%
HAp	6.07 ± 0.82	1.52 ± 0.53	31.50
Ca10−xTbx(PO4)6(OH)2
Ca9.95Tb0.05(PO4)6(OH)2	5.72 ± 0.76	1.61 ± 0.54	37.40
Ca9.9Tb0.1(PO4)6(OH)2	4.87 ± 0.71	1.89 ± 0.60	37.00
Ca9.75Tb0.25(PO4)6(OH)2	4.66 ± 0.72	1.97 ± 0.60	35.02
Ca9.5Tb0.5(PO4)6(OH)2	4.83 ± 0.57	1.91 ± 0.69	32.87
Ca9Tb1(PO4)6(OH)2	6.43 ± 0.70	1.44 ± 0.56	28.95