Magnetic Properties of Li1−xNi1+xO2(0 x 0.08)
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Magnetic properties of Li1−xNi1+xO2(0 
x 0.08) crystallizing in the α-NaFeO2structure were studied by SQUID magnetometry. A sample withx 0.01 prepared from Li2O2and Ni0.77O at 650°C follows the Curie–Weiss law from 350 to 80 K with μeff(effective Bohr magneton) of 1.91 μBand Θ (Weiss temperature) of +29.5 K. A spin glass-like thermomagnetic hysteresis with a cusp at 8 K was observed. Samples with largerxvalues exhibit ferromagnetic moments, typically 0.3 μB/Ni (x
0.08) at 5 K. From these and other results we conclude that the dominant intra-Ni layer interaction is ferromagnetic and that excess Ni ions located in the Li layers introduce strong ferromagnetic inter-Ni layer interactions. Possible importance of orbital–spin coupling and frustration in orbital ordering will be raised to the magnetism of ideal LiNiO2, in which Ni3+(S
x 0.08) crystallizing in the α-NaFeO2structure were studied by SQUID magnetometry. A sample withx 0.01 prepared from Li2O2and Ni0.77O at 650°C follows the Curie–Weiss law from 350 to 80 K with μeff(effective Bohr magneton) of 1.91 μBand Θ (Weiss temperature) of +29.5 K. A spin glass-like thermomagnetic hysteresis with a cusp at 8 K was observed. Samples with largerxvalues exhibit ferromagnetic moments, typically 0.3 μB/Ni (x 0.08) at 5 K. From these and other results we conclude that the dominant intra-Ni layer interaction is ferromagnetic and that excess Ni ions located in the Li layers introduce strong ferromagnetic inter-Ni layer interactions. Possible importance of orbital–spin coupling and frustration in orbital ordering will be raised to the magnetism of ideal LiNiO2, in which Ni3+(S