Issue 10, 2016

Revisiting Ce3Pt4Ge6 – crystal structure and physical properties

Abstract

Structural reinvestigations of Ce3Pt4Ge6 on high quality single crystals revealed additional reflections contradicting the previously reported structure featuring half occupied crystallographic sites for this compound. The structure could be solved and refined in the orthorhombic (3 + 1)D superspace group Cmcm(α,0,0)0s0 with α = 0.5a* and lattice parameters of a = 441.17(2), b = 2618.26(14) and c = 441.33(2) pm using the super space approach. The description of the modulated structure as commensurate case allows for an ordering of the Ce2/Ge3 atoms and the respective voids caused by the 50% occupation. The corresponding approximant can be described in the orthorhombic crystal system with space group Pnma and lattice parameters of a = 2618.26(14), b = 441.33(2) and c = 882.34(2) pm. Investigations of the magnetic properties revealed a magnetic moment of μeff = 2.48(1)μB/Ce atom and a Weiss constant of θp = −39(5) K, indicating stable trivalent cerium. No clear magnetic ordering was evident from the susceptibility measurements. Heat capacity investigations showed a λ-shaped anomaly at T = 2.1(1) K. Resistivity measurements show values corresponding to Ce3Pt4Ge6 being a metal, however nearly temperature independent behavior is observed down to low temperatures. A shallow minimum and an abrupt drop suggest the title compound to be a Kondo material.

Graphical abstract: Revisiting Ce3Pt4Ge6 – crystal structure and physical properties

Article information

Article type
Research Article
Submitted
14 Jul 2016
Accepted
17 Aug 2016
First published
19 Aug 2016
This article is Open Access
Creative Commons BY-NC license

Inorg. Chem. Front., 2016,3, 1289-1296

Revisiting Ce3Pt4Ge6 – crystal structure and physical properties

O. Janka, R. Hoffmann, M. Eilers-Rethwisch, U. Ch. Rodewald, O. Niehaus and R. Pöttgen, Inorg. Chem. Front., 2016, 3, 1289 DOI: 10.1039/C6QI00248J

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