Table 3. Crystallographic data of calcium orthophosphates27,112,113.
| Compound | Space group | Unit cell parameters | Z[a] | Density, g cm−3 |
|---|---|---|---|---|
| MCPM |
triclinic P |
a = 5.6261(5), b = 11.889(2), c = 6.4731(8) Å, α = 98.633(6)°, β = 118.262(6)°, γ = 83.344(6)° |
2 |
2.23 |
| MCPA |
triclinic P |
a = 7.5577(5), b = 8.2531(6), c = 5.5504(3) Å, α = 109.87(1)°, β = 93.68(1)°, γ = 109.15(1)° |
2 |
2.58 |
| DCPD |
monoclinic Ia |
a = 5.812(2), b = 15.180(3), c = 6.239(2) Å, β = 116.42(3)° |
4 |
2.32 |
| DCPA |
triclinic P |
a = 6.910(1), b = 6.627(2), c = 6.998(2) Å, α = 96.34(2)°, β = 103.82(2)°, γ = 88.33(2)° |
4 |
2.89 |
| OCP |
triclinic P |
a = 19.692(4), b = 9.523(2), c = 6.835(2) Å, α = 90.15(2)°, β = 92.54(2)°, γ = 108.65(1)° |
1 |
2.61 |
| α-TCP |
monoclinic P21/a |
a = 12.887(2), b = 27.280(4), c = 15.219(2) Å, β = 126.20(1)° |
24 |
2.86 |
| β-TCP |
rhombohedral R3cH |
a = b = 10.4183(5), c = 37.3464(23) Å, γ = 120° |
21[b] |
3.08 |
| HA |
monoclinic P21/b or hexagonal P63/m |
a = 9.84214(8), b = 2a, c = 6.8814(7) Å, γ = 120° (monoclinic) a = b = 9.4302(5), c = 6.8911(2) Å, γ = 120° (hexagonal) |
4 2 |
3.16 |
| FA |
hexagonal P63/m |
a = b = 9.367, c = 6.884 Å, γ = 120° |
2 |
3.20 |
| OA |
hexagonal P |
a = b = 9.432, c = 6.881 Å, α = 90.3°, β = 90.0°, γ = 119.9° |
1 |
~3.2 |
| TTCP | monoclinic P21 | a = 7.023(1), b = 11.986(4), c = 9.473(2) Å, β = 90.90(1)° | 4 | 3.05 |
[a] Number of formula units per unit cell. [b] Per the hexagonal unit cell.