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Figure 3
Interatomic distances for (a) Ti—O, (b) Bi—O and (c) Ba—O as functions of t (= x4q·rj). Symmetry codes: (i) x1, x2, x3, x4; (ii) x1, x2, x3 − 1, x4 − 1; (iii) −x1 + ½, −x2 − ½, −x3 + [3\over 2], −x4 + [3\over 2]; (iv) −x1 + ½, −x2 + ½, −x3 + [3\over 2], −x4 + [3\over 2]; (v) x1, x2, x3 + 1, x4 + 1; (vi) x1, x2, x3, x4 + 1; (vii) −x1 + 1, −x2, −x3 + 1, −x4 + 1; (viii) −x1 + 1, −x2, −x3 + 2, −x4 + 1; (ix) x1, x2, x3, x4 − 1; (x) x1, x2, x3 + 1, x4; (xi) −x1, −x2, −x3 + 2, −x4 + 1; (xii) x1 − ½, x2 − ½, x3 − ½, x4 − ½; (xiii) x1 − ½, x2 + ½, x3 − ½, x4 − ½; (xiv) x1 − ½, x2 − ½, x3 + ½, x4 + ½; (xv) x1 − ½, x2 + ½, x3 + ½, x4 + ½; (xvi) −x1 + ½, −x2 − ½, −x3 + [3\over 2], −x4 + ½; (xvii) −x1 + ½, −x2 + ½, −x3 + [3\over 2], −x4 + [1\over 2]; (xviii) −x1, −x2, −x3 + 1, −x4 + 1.

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