Abstract
Samples of the solid solution Eu1–xSrxAu4Cd2 (YbAl4Mo2 type, space group I4/mmm) with x = 0.2, 0.4, 0.6, and 0.8 were synthesized from the elements by annealing in sealed tantalum ampoules. The structures of Eu0.66Sr0.34Au4.12Cd1.88 and Eu0.22Sr0.78Au4.10Cd1.90 were refined from X-ray single crystal diffractometer data. Besides the expected Eu/Sr mixing on the 2a sites the diffraction data revealed also a small degree of Cd/Au mixing on the 4d sites of the cadmium chains. Temperature dependent magnetic susceptibility data show divalent europium and ferromagnetic ground states for all samples and a linear decrease of the Curie temperature from 16.3 K for EuAu4Cd2 to 2.9 K for Eu0.2Sr0.8Au4Cd2. Magnetization isotherms characterize the Eu1 − xSrxAu4Cd2 samples as soft ferromagnets. The divalent nature of europium is underpinned by 151Eu Mössbauer spectra. The decreasing Curie temperature goes along with a decreasing magnetic hyperfine field at 6 K.Graphic abstract
Highlights
Strontium and europium have almost similar radii
We have studied the complete solid solution Eu1 − xSrxAu4Cd2 for samples with x = 0.2, 0.4, 0.6, and 0.8
Similar behaviour has been observed in other solid solutions of europium and strontium such as Eu1 − xSrxPtIn2 [9]
Summary
Strontium and europium have almost similar radii. To give an example, Shannon [1] lists values of 118 (Sr2+) and 117 (Eu2+) pm for coordination number 6. In continuation of these studies we have investigated the solid solution Eu1–xSrxAu4Cd2 with YbAl4Mo2 type structure which shows adjustable Curie temperatures.
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