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| Samples | Lattice parameter (Å) | Ratio of c/a | Crystallite size (nm) | Microstrain | |
|---|---|---|---|---|---|
| a | c | ||||
| SL shells – CaCO3 | 4.942 | 16.946 | 3.429 | 14.347 ± 6.107 | 0.058 ± 0.050 |
| SL shells – 1000 °C | 3.591 | 4.957 | 1.380 | 13.752 ± 4.695 | 0.062 ± 0.029 |
| HAp | 9.411 | 6.833 | 0.726 | 31.620 ± 4.140 | 0.021 ± 0.013 |
