| Autor: |
Pilanda, Watkins-Curry, Kyle J, Pujol, Katherine A, Benavides, Joseph Vade, Burnett, Jenny K, Hedlund, Julia, Bykova, Gregory T, McCandless, Amy V, Walker, Julia Y, Chan |
| Rok vydání: |
2016 |
| Zdroj: |
Inorganic chemistry. 55(4) |
| ISSN: |
1520-510X |
| Popis: |
Single crystals of Pr2Fe(4-x)Co(x)Sb5 (1x2.5) were grown from a Bi flux and characterized by X-ray diffraction. The compounds adopt the La2Fe4Sb5 structure type (I4/mmm). The structure of Pr2Fe(4-x)Co(x)Sb5 (1x2.5) contains a network of transition metals forming isosceles triangles. The x ∼ 1 analogue is metallic and exhibits a magnetic transition at T1 ≈ 25 K. The magnetic moment obtained from the Curie-Weiss fit is 11.49(4) μ(B), which is larger than the spin-only Pr(3+) moment. The x ∼ 2 analogue orders magnetically at T1 ≈ 80 and T2 ≈ 45 K. This is the first case of the substitution of Co into the La2Fe4Sb5 structure type, evidenced by the increased concentration of dopant with decreased lattice parameters coupled with a change in the transition temperature with a change in the cobalt concentration. The added complexity in the magnetic behavior of the x ∼ 1 and 2 analogues indicates that the increased concentration of Co invokes an additional magnetic contribution of the transition metal in the sublattice. Furthermore, X-ray photoelectron spectroscopy measurements support the change in the oxidation states of transition metals with increasing cobalt concentration. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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