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A schematic representation of the phase transition from cubic a-ZrW2O8 to orthorhombic g-ZrW2O8. This phase transition leads to a tripling of the cubic cell parameter in one dimension. One can describe the transition as involving the inversion of one in three pairs of 2(WO4) tetrahedra followed by a rotation of polyhedral units. The increase in O and W coordination at the phase transition is not shown in this animation. |