Abstract
Polycrystalline Eu2Ta2O7 containing layered perovskite slabs was prepared and analyzed. Eu2Ta2O7 crystallizes in the orthorhombic centrosymmetric Cmcm space group (with unit cell: a = 3.95156(9), b = 27.0775(6), and c = 5.68279(13) Å) isomorphous with high-temperature Sr2Ta2O7. Dielectric measurements reveal that, in contrast to Sr2Ta2O7 which is ferroelectric below 166 K, Eu2Ta2O7 remains paraelectric down to at least 0.45 K and shows no magneto-dielectric coupling. Magnetic data in the 2–400 K range indicate an antiferromagnetic phase transition with a sharp susceptibility peak at 2.71(5) K. Further analysis using specific heat measurements reveals that the second magnetic phase transition occurs at 1.10(5) K and dominates the spin entropy of the Eu2+ 4f7 ions. The possible origin of the two successive magnetic phase transitions in Eu2Ta2O7 requires further studies.
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