Add time:08/10/2019 Source:sciencedirect.com
The temperature dependences of heat capacity, Cp(T), and lattice parameters, a(T), b(T), c(T), of ErB50 in the temperature range of 2–300 K were experimentally studied. Two features in Cp(T) were observed: a maximum at Tm1 = 3.12 K, that is associated with a magnetic ordering (transition to an antiferromagnetic state), and a broad anomaly at about Tm2 = 27 K that is due to the effects of the crystal electric field (CEF) on the boride heat capacity. Based on these data a scheme of splitting of Er3+ions f-levels by the crystal field was suggested. Comparison of the temperature dependence of unit cell volume V(T) for ErB50 with the literature data for LuB50 revealed an excess contribution into the thermal expansion of erbium boride at low temperatures. It was determined that this contribution is due to the CEF effects on ErB50 thermal expansion.
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