Jump to main content
Jump to site search

Issue 42, 2013
Previous Article Next Article

Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

Author affiliations

Abstract

The oxidation of an intermetallic phase under high-pressure/high-temperature conditions led to the synthesis of Ce4Ag3Ge4O0.5 exhibiting [OCe2Ce2/2] tetrahedral chains, in which the oxygen atoms statistically occupy the tetrahedral centres. Starting from a 1 : 1 : 1 CeAgGe precursor (NdPtSb type), a multianvil high-pressure/high-temperature experiment at 11.5 GPa and 1250–1300 °C revealed Ce4Ag3Ge4O0.5, crystallizing in the space group Pnma with the following lattice parameters: a = 2087.3(4), b = 439.9(1), and c = 1113.8(2) pm. Magnetic measurements showed Curie–Weiss behavior above 100 K with an experimental magnetic moment of 2.42 µB per Ce atom, close to the value for the free Ce3+ ion, clearly indicating trivalent cerium in Ce4Ag3Ge4O0.5. Full potential GGA+U band structure calculations resulted in metallic properties and a magnetic ground state with one unpaired 4f-electron per cerium in agreement with the experiments.

Graphical abstract: Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

Back to tab navigation

Article information


Submitted
24 Jun 2013
Accepted
27 Aug 2013
First published
12 Sep 2013

Dalton Trans., 2013,42, 15207-15213
Article type
Paper

Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

G. Heymann, J. F. Riecken, D. Johrendt, S. Rayaprol, R. Pöttgen and H. Huppertz, Dalton Trans., 2013, 42, 15207
DOI: 10.1039/C3DT51683K

Social activity

Search articles by author

Spotlight

Advertisements