Several hundreds or even thousands of ternary and quaternary tungsten oxides are known today. They are only partly described in the literature and can be found in the relevant compilations. They are, however, the top of an iceberg of a much larger number of compounds which might form, in principle, with a large number of elements and/or element combinations. In this sense, the crystal chemistry of tungsten oxides can be regarded as one of the most complex and richest fields in the structural chemistry of the elements.
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