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Ferroelectric Phase Transition in Perovskite Oxide CdTiO 3

Single crystals of CdTiO 3 were synthesized by a flux method. The obtained single crystals showed the orthorhombic perovskite structure with the space group Pnma at room temperature, and a dielectric anomaly appeared near 80 K, which was similar to the polycrystalline samples. The temperature dependence of the dielectric constants along three directions was investigated, and a dielectric anisotropy was observed. The comparison of the measured dielectric constants indicates that the polarization of CdTiO 3 is directed along the b axis of the space group Pnma .