The orthogonal unit cell of the compound L-Ta205 has dimensions a=6. 198, b=40"29, c=3.888 /~ and contains 11 formula units. The structure was solved in projection from the Patterson function and refined to a conventional R value of 0.088 using full-matrix least-squares methods. The metal atoms are arranged in sheets and are surrounded by oxygen atoms which form either distorted octahedral or pentagonal bipyramidal coordination polyhedra. The structure contains, on the average, three distortion planes per unit cell. These are statistically distributed over four sites, thereby giving the average~unit cell a higher symmetry than the real unit cell. The thermal equilibration of the compound, involving detectable structural changes, is discussed in terms of the migration of distortion planes.
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