Abstract
Abstract High-pressure X-ray scattering study of NH4LiSO4 has been made up to 16 kbar at room temperature in a gasketted diamond anvil cell. It undergoes phase transitions at about 6.5 kbar from the ferroelectric phase to an intermediate pressure phase, then to a super structure phase (a=2a0, b=2b0, c=c0) at about 12.4 kbar. Symmetries of the intermediate and super structure phases have been determined as P2111(Z=4) and C111 (Z=48). Crystal structure was analyzed at 5.7, 6.9 and 9.5 kbar.
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