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Condensed Modes of WO3 Represented by the Normal Modes in the Space Group D4h7

The prototypic phase of WO 3 is considered to be the tetragonal phase with the space group D 4 h 7 , that is the highest temperature phase, to explain systematically the displasive successive phase transitions of WO 3 . The normal modes at the points \( \varGamma \), Z , M and A in the tetragonal Brillouin zone are studied with the help of the group theory and are compared with the normal modes in the cubic WO 3 that is the hypothetic prototype with the space group O h 1 . The condensed modes in each phase of WO 3 are described by the irreducible representations of the normal modes in the tetragonal WO 3 , referring to the results of X-ray and neutron diffraction studies.