Abstract
Magnetic properties of the quaternary oxides Ba2LnTaO6 (Ln = Y or lanthanides) are reported. Their powder x-ray diffractionmeasurements and Rietveld analysis show that they have an orderedperovskite structure and are monoclinic (Ln = La-Tb) withspace group P21/n or cubic (Ln = Y, Dy-Lu) with space groupFm3̄m. Magnetic susceptibilities of Ba2LnTaO6 were measured.All compounds in this work are paramagnetic down to 5 K. Ba2EuTaO6and Ba2SmTaO6 show Van Vleck paramagnetism; their spin-orbit couplingconstants are determined to be 331 cm-1 and 287 cm-1,respectively. 151Eu Mössbauer measurements for Ba2EuTaO6 werecarried out at 12, 100, 200 and 300 K. The Eu ion is in the trivalentstate, and the symmetry of the Eu site is distorted from the octahedralsymmetry. The Debye temperature of Eu3+ was determined to be 335 K from thetemperature dependence of the absorption area of intensity curves.
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