Abstract
Abstract Samples of SrAgZn and EuAgZn were synthesized by reaction of the elements in sealed tantalum crucibles. Both structures were refined on the basis of single crystal X-ray diffractometer data: KHg 2 -type, Imma , a =476.7(1), b =780.9(2), c =810.1(2) pm, R 1 / wR 2 =0.0189/0.0119, 381 F ² values for SrAg 1.12 Zn 0.88 and a =474.43(9), b =760.8(2), c =799.0(2) pm, R 1 / wR 2 =0.0226/0.0483, 370 F ² values for EuAg 1.17 Zn 0.83 with 13 variables per refinement. Silver and zinc are randomly distributed on the Hg position and build up three-dimensional networks. EuAgZn shows ferromagnetic ordering at 29(1) K. In the temperature range from 75 to 300 K the sample shows Curie–Weiss behaviour with μ eff =7.87(1) μ B /Eu atom and θ P =37.1(1) K, indicating divalent europium. 151 Eu Mossbauer spectroscopic measurements confirmed the divalent state with an isomer shift of −9.31 mm/s at 78 K. Temperature dependent 151 Eu data show first magnetic hyperfine field splitting at 25 K and a saturated magnetization of 17 T at 5.2 K. The temperature dependence can be described by an S =7/2 Brillouin function.
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