Figure 1 Fragment of the crystal structure of La4Mo7O27. Atoms are indicated as ellipsoids with probability regions of 50%. [Symmetry codes: (i) -x + 1,-y,z + 1/2; (ii) -x + 1, -y - 1, z + [{1\over 2}]; (iii) -x + [{3\over 2}], y, z + [{1\over 2}]; (iv) x, y + 1, z; (v) x, y - 1, z; (vi) x - [{1\over 2}], -y - 1, z; (vii) x - [{1\over 2}], -y, z; (viii) -x + [{3\over 2}], y - 1, z + [{1\over 2}]; (ix) x + [{1\over 2}], -y, z; (x) x + [{1\over 2}], -y - 1, z.]  [article HTML]