TY - JOUR
T1 - Mixed valency in Yb7Co4InGe12
T2 - A novel intermetallic compound stabilized in liquid indium
AU - Chondroudi, Maria
AU - Balasubramanian, Mahalingam
AU - Welp, Ulrich
AU - Kwok, Wai K.
AU - Kanatzidis, Mercouri G.
PY - 2007/9/18
Y1 - 2007/9/18
N2 - The quaternary compounds RE7Co4InGd12 (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 Yb7Co 4InGe12 is a mixed-valence compound and that the relative Yb3+/Yb2+ ratio is slightly temperature-dependent. Additionally, resistivity measurements for Yb7Co4InGe 12 exhibited negative magnetoresistance at low temperatures.
AB - The quaternary compounds RE7Co4InGd12 (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 Yb7Co 4InGe12 is a mixed-valence compound and that the relative Yb3+/Yb2+ ratio is slightly temperature-dependent. Additionally, resistivity measurements for Yb7Co4InGe 12 exhibited negative magnetoresistance at low temperatures.
UR - http://www.scopus.com/inward/record.url?scp=34948886270&partnerID=8YFLogxK
U2 - 10.1021/cm071687q
DO - 10.1021/cm071687q
M3 - Article
AN - SCOPUS:34948886270
SN - 0897-4756
VL - 19
SP - 4769
EP - 4775
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 19
ER -