Abstract
High resolution x-ray diffraction at temperatures from 7 to 300 K shows thatat room temperature caesium tetrachloromercurate Cs2HgCl4 hasthe β-K2SO4 structure but on cooling exhibits a sequenceof incommensurate and commensurate modulations along a* and c* axes. Two modulation phases, one of which is incommensurate, are foundbetween 184 and 221 K with wavevectors along a* and, below 184 K, sixfurther modulation phases, one of which is incommensurate, are found withwavevectors along c*.
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