Europium oxyhydroxide crystals were synthesized by the flux method. The as-grown crystals were transparent and had a plate-like shape with natural flat surfaces. The powder XRD data were refined by assuming a monoclinic structure of the space group P21/m and lattice parameters of a=0.4346 nm, b=0.3744 nm, c=0.6107 nm, and β=108.62°. The magnetic susceptibility of the EuOOH crystals exhibited typical Van Vleck temperature-independent paramagnetism below 120 K. The calculated susceptibility, based on Van Vleck’s theory, agreed with the experimental data to some extent, with the coupling constantλ=458±10 K. The ex-perimental results were in close agreement with the results calculated using a modified formula withλ=505±2 K and a constant term C=4.6×10?4 emu/(mol·Oe).
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