Crystalline phase composition, Ca/P ratio, percent weight of Eu³⁺ in the samples, average particle dimensions (length, width) measured by SEM and/or TEM and average dimensions (length, width) of the crystalline domains determined by Rietveld refinement.

[Eu3+]0, M (x)	Crystalline phasesa	Ca/P ratiob	wt% Eub	L (nm)	W (nm)	L (nm) (Rietveld)	W (nm) (Rietveld)
0.001 4 h	Ap	1.59 ± 0.14	1.72 ± 0.31	23.5 ± 5.4	23.5 ± 5.4	25.4 ± 6.9	7.9 ± 0.9
0.001 24 h	Ap	1.65 ± 0.24	1.56 ± 0.37	38.7 ± 5.8	18.7 ± 6.2	32.9 ± 8.3	11.2 ± 1.2
0.001 96 h	Ap	1.63 ± 0.09	2.04 ± 0.27	39.2 ± 5.3	9.6 ± 1.4	35.1 ± 0.5	11.7 ± 0.1
0.005 4 h	Ap + OCP	1.34 ± 0.42	14.6 ± 2.1	65.3 ± 9.3	65.3 ± 9.3	26 ± 0.9	5.1 ± 0.1
0.005 24 h	Ap	1.53 ± 0.12	6.40 ± 0.48	170.4 ± 6.5	52.5 ± 6.4	41.2 ± 0.7	9.1 ± 0.1
0.005 96 h	Ap	1.48 ± 0.18	5.25 ± 0.68	127 ± 27	17.9 ± 7.2	39.7 ± 0.7	9.3 ± 0.1
0.010 4 h	Ap + OCP	1.08 ± 0.54	23.8 ± 5.7	526 ± 235	134.5 ± 40.7	54.7 ± 6.4	31.2 ± 1.4
0.010 24 h	Ap	1.08 ± 0.15	24.0 ± 7.7	325 ± 50	73 ± 7	79.7 ± 3.6	60.4 ± 1.4
0.010 96 h	Ap	1.54 ± 0.14	11.5 ± 0.3	380 ± 65	92 ± 12	80.5 ± 2.2	53.5 ± 0.7
0.010 7 d	Ap	1.53 ± 0.04	5.4 ± 1.2	90 ± 21	90 ± 21	30.6 ± 0.8	13.6 ± 0.1
0.020 4 h	Ap + OCP	0.98 ± 0.02	13.0 ± 0.3	340 ± 50	75 ± 10	92.3 ± 2.3	62.3 ± 1.3
0.020 24 h	Ap + OCP	1.05 ± 0.03	20.6 ± 0.4	1250 ± 15	225 ± 40	328 ± 5.6 d	247 ± 4.1d
0.020 96 h	Ap + OCP	1.45 ± 0.01	13.3 ± 2.6	1870 ± 100	260 ± 45	567 ± 4.5d	166 ± 3.2d
0.030 96 hc	Ap + OCP	1.56 ± 0.01	10.03 ± 0.3	1230 ± 50	210 ± 55	643 ± 10.2d	128 ± 9.8d

^aAp = apatitic phase; OCP = octacalcium phosphate.

^bMeasured by EDS technique averaging the composition of 6–10 different zones of the Ap phase.

^cAt this timepoint the europium phosphate phase started to appear.

^dCalculated crystallite dimensions greater than 100–150 nm have to be considered only as an estimated trend. They are accurate only for dimensions below these sizes, because for bigger sizes the difference between the instrumental FWHM contribution and the FWHM contribution due to the size is negligible.