The quaternary compounds RE 7 Co 4 InGe 12 (RE = Dy, Ho, Yb) were obtained from In flux reactions as thin silver needles. RE 7 Co 4 InGe 12 crystallizes in the tetragonal P4/m space group under a new structure type which is characterized by columnar units forming three different types of channels with the RE atoms situated within these channels. Investigation of the Yb analog with magnetic susceptibility measurements, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge spectroscopy (XANES) revealed that Yb 7 Co 4 InGe 12 is a mixed-valence compound and that the relative Yb 3+ /Yb 2+ ratio is slightly temperature-dependent. Additionally, resistivity measurements for Yb 7 Co 4 InGe 12 exhibited negative magnetoresistance at low temperatures.
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Chondroudi et al. (2007) studied this question.
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