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Inducing Ferroelectricity in NH4I and NH4Br via Partial Replacement of Protons by Deuterons

Miao Miao Zhao,Lei Meng,Yi Yang Xu,Na Du,Fei Yen

While all of the polymorphs of NH4I and NH4Br are nonpolar, a reversible electric polarization is established in the ordered γ phases of (NH4)0.73(ND4)0.27I and (NH4)0.84(ND4)0.16Br (where D is 2H) via dc electric fields. The presence of two groups of orbital magnetic moments appears to be responsible for the asymmetric lattice distortions. Our findings provide an alternative pathway for hydrogen-based materials to potentially add a ferroelectric functionality.