Spin-driven ferroelectricity in the delafossite CuFe{sub 1-x}Rh{sub x}O{sub 2} (0<=x<=0.15)

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.11.023· OSTI ID:21372488

Pachoud, E ^[1]; Martin, C; Kundys, B; Simon, Ch; Maignan, A ^[1]

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1. Laboratoire CRISMAT, UMR 6508 CNRS/ENSICAEN, 6 bd du Marechal Juin, F-14050 CAEN Cedex 4 (France)

The effect of substitution at the Fe site in the CuFeO{sub 2} delafossite is known to induce a magnetic structure responsible for the appearance of electric polarization. A CuFe{sub 1-x}Rh{sub x}O{sub 2} series of ceramic samples is studied in order to determine the composition range exhibiting such a polar state. It is found that for the CuFe{sub 1-x}Rh{sub x}O{sub 2} (x<=0.15) solid solution, the Neel temperature T{sub N2} decreases monotonously with x from 11.5 K to 5.9 K, for x=0.00 to 0.15, respectively, and that the dielectric peak and the polarization transition temperatures coincide with T{sub N2}. In contrast, the dielectric peak and polarization magnitudes go through an optimum for CuFe{sub 0.92}Rh{sub 0.08}O{sub 2} (x=0.08). These results demonstrate that, compared to other substituting elements, the Rh{sup 3+} for Fe{sup 3+} substitution in CuFeO{sub 2} allows to extend significantly the ferroelectric region in the (x, T) phase diagram in connection with the slower T{sub N2} decrease. - Graphical Abstract: Polycrystalline samples of the delafossite solid solution CuFe{sub 1-x}Rh{sub x}O{sub 2} were synthesized and characterized. Polarization has been observed in the range 0.02<x<=0.15 with characteristic temperatures in coincidence with magnetic transition temperatures.

• OSTI ID: 21372488
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 2; Other Information: DOI: 10.1016/j.jssc.2009.11.023; PII: S0022-4596(09)00552-0; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
COPPER COMPOUNDS
FERROELECTRIC MATERIALS
IRON IONS
IRON OXIDES
MAGNETIC PROPERTIES
NEEL TEMPERATURE
PHASE DIAGRAMS
POLARIZATION
POLYCRYSTALS
RHODIUM IONS
RHODIUM OXIDES
SOLID SOLUTIONS
TEMPERATURE RANGE 0000-0013 K
CHALCOGENIDES
CHARGED PARTICLES
CRYSTALS
DIAGRAMS
DIELECTRIC MATERIALS
DISPERSIONS
HOMOGENEOUS MIXTURES
INFORMATION
IONS
IRON COMPOUNDS
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RHODIUM COMPOUNDS
SOLUTIONS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE