Mixed valency in Yb7Co4InGe12:: a novel intermetallic compound stabilized in liquid indium

被引：38

作者：

Chondroudi, Maria

Balasubramanian, Mahalingarn

Welp, Ulrich

Kwok, Wai-K.

Kanatzidis, Mercouri G.

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

[4] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

来源：

CHEMISTRY OF MATERIALS | 2007年 / 19卷 / 19期

关键词：

D O I：

10.1021/cm071687q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The quaternary compounds RE7CO4InGe12 (RE = Dy, Ho, Yb) were obtained from In flux reactions as thin silver needles. RE7CO4InGe12 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 Yb7Co4InGe12 is a mixed-valence compound and that the relative Yb3+/Yb2+ ratio is slightly temperature-dependent. Additionally, resistivity measurements for Yb7Co4InGe12 exhibited negative magnetoresistance at low temperatures.

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页码：4769 / 4775

页数：7

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