Abstract
Abstract The incommensurate and commensurate superstructures of K2MoO4, Rb2WO4 and K2WO4 are shown to have orthorhombic symmetry rather than the hexagonal symmetry, reported earlier. The structures belong essentially to the β-K2SO4 type. The β-K2SO4 structure can be regarded as a commensurate superstructure of the α-K2SO4 structure by doubling of the unit cell. In this sense β-K2SO4 and K2MoO4 have the same average structures. Rb2WO4 displays a lock-in transition at 681 K where the incommensurate distortion wave vector jumps from an incommensurate value to the value 0.5 which results in the β-K2SO4 type. The distortion wave vectors of the other compounds range from 0.25 to 0.5.
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