Abstract
Samples of the solid solution EuRh2−xZnx with x ≈ 1 were synthesized by high-frequency melting of the elements in sealed tantalum tubes. They crystallize with the structure of the cubic Laves phase MgCu2. The structure of one crystal was refined from single-crystal X-ray diffractometer data: space group Fd3m, a = 768.58(6) pm, wR2 = 0.0121, 99 F2 values, 6 variables. The rhodium and zinc atoms statistically occupy the 16d site of the three-dimensional tetrahedral network. The europium atoms have coordination number 16 by 12 Rh/Zn and 4 Eu neighbors. The sample with nominal composition EuRh1.2Zn0.8 was studied with respect to its physical properties. EuRh1.2Zn0.8 shows stable divalent europium (8.00 μB/Eu atom) and orders ferromagnetically at TC = 95 K. Magnetization isotherms characterize EuRh1.2Zn0.8 as a soft ferromagnet. 151Eu Mossbauer spectroscopic data confirm the europium valence state (δ = −7.44 mm/s at 77 K) and the magnetic ordering. According to magnetocaloric investigations, EuRh1.2Zn0.8 has ...
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