Anomalous neutron scattering and the question of ferroelectricity in ⁶Li(N₂H₅)SO₄

The mechanism of the supposed ferroelectric switching in crystals of ⁶Li(N₂H₅)SO₄ was examined by studying the effect of the anomalous scattering of neutrons from ⁶Li on the structure factors of Bijvoet pairs both before and after ferroelectric switching. The absence of any observable change confirms the results of Schmidt, Drumheller & Howell [Phys. Rev. (1971). B12, 4582] that Li(N₂H₅)SO₄ is not ferroelectric.