| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1488397 | Materials Research Bulletin | 2014 | 7 Pages |
•Relaxation of the rhombohedral distortion of the FeO6 octahedra.•Ca/Mg introduced into Fe layers blurs the magnetic transitions•Increase of the dielectric permittivity at Neel temperature TN2.
In this work, we investigate crystal structure of delafossite-type oxide CuFe1−x(Ca, Mg)xO2 (0 ≤ x ≤ 0.04). It's known to induce a distortion in the structure, there is an important variation in the two lattice parameters a and c because of the big substitution of biunique radius of Ca2+ and Mg2+ (rCa2+ = 1 Å, rMg2+ = 0.74 Å). Magnetic susceptibility measurements show a magnetic dilution for Ca-doped simples and an amplification of χ with Mg-doping. Temperature dependence of the dielectric permittivity for CuFe1−xMgxO2 present an amplification of ϵ′ at TN2 = 9.1 K
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