Abstract
Ternary rare earth oxides Eu Ln 2O 4 ( Ln=Gd, Dy–Lu) were prepared. They crystallized in an orthorhombic CaFe 2O 4-type structure with space group Pnma. 151Eu Mössbauer spectroscopic measurements show that the Eu ions are in the divalent state. All these compounds show an antiferromagnetic transition at 4.2–6.3 K. From the positive Weiss constant and the saturation of magnetization for EuLu 2O 4, it is considered that ferromagnetic chains of Eu 2+ are aligned along the b-axis of the orthorhombic unit cell, with neighboring Eu 2+ chains antiparallel. When Ln=Gd–Tm, ferromagnetically aligned Eu 2+ ions interact with the Ln 3+ ions, which would overcome the magnetic frustration of triangularly aligned Ln 3+ ions and the Eu Ln 2O 4 compounds show a simple antiferromagnetic behavior.
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