Journal
SOLID STATE COMMUNICATIONS
Volume 151, Issue 23, Pages 1798-1801Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2011.08.023
Keywords
Low-dimensional oxides; Microstructure; Thermoelectricity
Categories
Funding
- ANR [ANR-08-BLAN-0005-01]
- Region Basse-Normandie
- Ministere de la Recherche
- FGU
- Research Unit 960 Quantum Phase Transitions
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0005] Funding Source: Agence Nationale de la Recherche (ANR)
Ask authors/readers for more resources
A detailed investigation of the series CuCr1-xMgxO2 (x = 0.0-0.05) has been performed by making high-temperature resistivity and thermopower measurements, and by performing a theoretical analysis of the latter. Microstructure characterization has been carried out as well. Upon Mg2+ for Cr3+ substitution, a concomitant decrease in the electrical resistivity and thermopower values is found, up to x similar to 0.02-0.03, indicating a low solubility limit of Mg in the structure. This result is corroborated by scanning electron microscopy observations, showing the presence of MgCr2O4 spinels as soon as x = 0.005. The thermopower is discussed in the temperature-independent correlation function ratio approximation as based on the Kubo formalism, and the dependence of the effective charge carrier density on the nominal Mg substitution rate is addressed. This leads to a solubility limit of 1.1% Mg in the delafossite, confirmed by energy dispersive X-ray spectroscopy analysis. (C) 2011 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available