Abstract
Abstract Gd 2 Ni 2 Mg was synthesised by reaction of the elements in a sealed tantalum tube in a high-frequency furnace. The structure was investigated by single crystal X-ray diffraction: Mo 2 FeB 2 type, P 4/ mbm , a =743.8(1), c =375.3(1) pm, wR 2 =0.0560, 256 F 2 values, 12 variables. The Gd 2 Ni 2 Mg structure is an intergrowth of distorted AlB 2 and CsCl slabs of compositions GdNi 2 and GdMg. The magnetic phase transitions were studied by AC and DC magnetic susceptibility measurements and 155 Gd Mossbauer spectroscopy. Antiferromagnetic ordering is detected at T N =49.00(5) K followed by two further transitions at T f1 =20.70(5) and T f2 =4.5(1) K, respectively. Non-vanishing second and third harmonic components of the induced voltage under application of a small AC magnetic field reveal the ferromagnetic nature of the second transition at T f1 . Below T f1 , Gd 2 Ni 2 Mg shows strong irreversibility between field cooled (FC) and zero field cooled (ZFC) DC magnetization and magnetic hysteresis behaviour.
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