Table 3 The calculated interatomic distances in pure HAp and the HAp:RE³⁺ powders.

Ca1-O1: 2.389(3) × 3

Ca1-O1: 2.415(3) × 3

Ca1-O1: 2.398(1) × 3

Ca1-O1: 2.402(1) × 3

Ca1-O2: 2.495(7) × 3

Ca1-O2: 2.458(7) × 3

Ca1-O2: 2.487(3) × 3

Ca1-O2: 2.467(3) × 3

Ca1-O3: 2.921(9) × 3

Ca1-O3: 2.793(7) × 3

Ca1-O3: 2.865(4) × 3

Ca1-O3: 2.809(3) × 3

‹Ca1-O› 2.601

‹Ca1-O› 2.552

‹Ca1-O› 2.583

‹Ca1-O› 2.560

Ca2-O1: 2.754(4)

Ca2-O1: 2.707(5)

Ca2-O1: 2.710(2)

Ca2-O1: 2.696(1)

Ca2-O2: 2.382(2)

Ca2-O2: 2.351(7)

Ca2-O2: 2.349(6)

Ca2-O2: 2.364(8)

Ca2-O3: 2.573(9) × 2

Ca2-O3: 2.555(9) × 2

Ca2-O3: 2.319(4) × 2

Ca2-O3: 2.530(3) × 2

Ca2-O3: 2.291(4) × 2

Ca2-O3: 2.328(1) × 2

Ca2-O3: 2.529(9) × 2

Ca2-O3: 2.337) × 2

Ca2-O4: 2.403(9)

Ca2-O4: 2.398(2)

Ca2-O4: 2.399(2)

Ca2-O4: 2.387(8)

‹Ca2-O› 2.467

‹Ca2-O› 2.460

‹Ca2-O› 2.450

‹Ca2-O› 2.454

P-O1: 1.534(5)

P-O1: 1.534(9)

P-O1: 1.534(5)

P-O1: 1.535(3)

P-O2: 1.528(1)

P-O2: 1.533(1)

P-O2: 1.533(2)

P-O2: 1.533(8)

P-O3: 1.533(3) x 2

P-O3: 1.533(2) x 2

P-O3: 1.533(6) x 2

P-O3: 1.534(2) x 2

‹P-O› 1.532

‹P-O› 1.533

‹P-O› 1.533

‹P-O› 1.534