Abstract
The magnetic properties of the layered perovskite compounds NaLnTiO4(Ln=Sm, Eu, and Gd) are reported. Their dc susceptibilities were measured from 4.5 to 320 K. The Mössbauer spectrum of151Eu and the electron paramagnetic resonance (EPR) spectrum of Gd3+were also measured at room temperature. NaEuTiO4shows Van Vleck paramagnetism which corresponds to the singlet ground state7F0of Eu3+ions, with a spin–orbit coupling constantγ=323 cm−1. NaSmTiO4also behaves as a Van Vleck paramagnet. The magnetic susceptiblity of NaGdTiO4follows the Curie law. The Mössbauer spectrum of NaEuTiO4clearly shows that Eu is in the trivalent state, and a quadrupole interaction is found to exist in this compound. From the EPR measurement thegvalue of Gd3+in NaGdTiO4is determined to be 1.99. Both the magnetic susceptibility results and the EPR measurements show that Gd3+ion in this compound is scarcely affected by the crystal field.
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