Abstract
Ce23Ru7Zn4 was obtained by melting of the elements in a sealed niobium ampoule in an induction furnace and subsequently by slow cooling in a muffle furnace. The structure was refined from X-ray single crystal diffractometer data at room temperature and can be described in the Pr23Ir7Mg4 type structure: P63mc, a = 985.7(1), c = 2215.0(3) pm, wR = 0.0577, 2481 F2 values, 75 variables. Like often described for intermetallic Ce–Ru compounds, also for Ce23Ru7Zn4 Ce–Ru distances (252 pm) far below the sum of the covalent radii (289 pm) can be observed. Such a behavior can only be explained by partly tetravalent cerium and this is confirmed by susceptibility measurements. According to a Curie–Weiss fit a cerium valence of 3.11(3) could be calculated and no magnetic ordering down to 2.5 K could be found.
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