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Large Spontaneous Polarization and Clear Hysteresis Loop of a Room-Temperature Hybrid Ferroelectric Based on Mixed-Halide [BiI 3 Cl 2 ] Polar Chains and Methylviologen Dication

2011; American Chemical Society; Volume: 133; Issue: 38 Linguagem: Inglês

10.1021/ja206171s

1943-2984

Nicolas Leblanc, Nicolas Mercier, Leokadiya V. Zorina, Sergey V. Simonov, Pascale Auban‐Senzier, Claude Pasquier,

Acoustic Wave Resonator Technologies

The search for hybrid organic-inorganic materials, which have the great advantage that they can be synthesized at moderate temperature (T < 200 °C), remains a great challenge in the field of ferroelectrics. Here, a room-temperature ferroelectric material with interesting characteristics, (MV)[BiI(3)Cl(2)] (MV(2+) = methylviologen), is reported. Its structure is based on polar inorganic chains resulting from a remarkable Cl/I segregation induced by methylviologen entities, which coincide with the fourfold polar axis of the tetragonal structure. Of great importance is that this room-temperature hybrid ferroelectric displays a clear electrical hysteresis loop with a large spontaneous polarization (>15 μC·cm(-2)).