Van Vleck paramagnetism of europium oxyhydroxide
来源期刊：Journal of Rare Earths2015年第2期
论文作者：Hiroaki Samata Naoki Wada Tadashi C.Ozawa
文章页码：177 - 181
摘 要：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 constant λ=458±10 K. The experimental results were in close agreement with the results calculated using a modified formula with λ=505±2 K and a constant term C=4.6×10-4 emu/（mol·Oe）.
Hiroaki Samata1，Naoki Wada1，Tadashi C.Ozawa2
1. Graduate School of Maritime Sciences, Kobe University, Fukaeminami,Higashinada, Kobe, Hyogo 658-0022, Japan2. International Center for Materials Nanoarchitectonics, National Institute for Materials Science,Namiki, Tsukuba, Ibaraki 305-0044, Japan
摘 要：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 constant λ=458±10 K. The experimental results were in close agreement with the results calculated using a modified formula with λ=505±2 K and a constant term C=4.6×10-4 emu/（mol·Oe）.
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