α α = 4.7929 Å α = 4.8140 Å 4.4 × 10 3 (1 1 1) (0 0 2) δ (3 1 1) δ δ = 4.772 Å (1 1 1) δ (1 1 1) δ Copyright © Advanced Nuclear Technology International Europe AB, ANT International, 2019.