Intergrowth in tunnel structures: The titanates A2Ti6O13)n·A′Ti4Og |
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Authors: | M Hervieu G Desgardin B Raveau |
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Institution: | Laboratoire de Cristallographie et Chimie du Solide, L.A. 251, ISMRA, Université de Caen, 14032 Caen Cedex, France |
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Abstract: | A new structural family, (A2M6O13)n·A′M4O9, was isolated and studied by means of X-ray diffraction, electron diffraction, and electron microscopy. The structure consists of an ordered intergrowth of two types of structural units: A2Ti6O13 and hypothetical A′M4O9, both characterized by zigzag ribbons of, respectively, 2 × 3 and 2 × 2 edge-sharing octahedra, joined by corner sharing to form a series of open tunnels containing A and A′ cations. The monoclinic unit-cell parameters can be deduced, for an “n” term, from those of A2Ti6O13. |
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