Ferroelectric Rare-Earth Molybdates

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Abstract
The molybdates of Sm, Eu, Tb, and Dy are isotypic with ferroelectric Gd2(MoO4)3. Other compositions of this structure occur in the pseudoternary system Gd–La–Y‐molybdate and in the pseudobinary system Gd2(MoO4)3–Gd2(WO4)3. A representative number of these compositions were grown as single crystals and tested for ferroelectricity. Each was found to be ferroelectric as evidenced by a ferroelectric hysteresis loop and by visual observation of domains. The Curie temperatures (T C), spontaneous polarizations (P s), and coercive fields (E c) were determined, with values ranging as follows: T C, 148°–190°C; P s, 0.14–0.23 μC/cm2 at 25°C; E c, 5.0–14.5 kV/cm at 25°C.

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