| Autor: |
El Hachmi, A., Manoun, B., Tamraoui, Y., Louihi, S., Bih, L., Sajieddine, M., Lazor, P. |
| Předmět: |
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| Zdroj: |
Journal of Structural Chemistry; Jun2020, Vol. 61 Issue 6, p861-872, 12p |
| Abstrakt: |
Sr1.50Ca1.50Fe2.25Mo0.75O9−δ and Sr1.92Ca1.08Fe1.04W0.96O9−δ double perovskites are synthesized in the polycrystalline form by a solid-state reaction route in air and studied at room temperature using the of PXRD, Raman and Mössbauer spectroscopy techniques. The Rietveld refinement analysis reveals that both compounds adopt a tetragonal system with the space group I4/m and lattice parameters a = b = 5.5176(1) Å and c = 7.8065(2) Å for Sr1.50Ca1.50Fe2.25Mo0.75O9−δ and a = b = 5.5453(1) Å and c = 7.8388(1) Å for Sr1.92Ca1.08Fe2.04W0.96O9−δ. Raman spectra are consistent with the group theoretical analysis predicted for tetragonal symmetry I4/m (point group C4h5). 57Fe Mössbauer spectra recorded at room temperature show a paramagnetic behavior for Sr1.50Ca1.50Fe2.25Mo0.75O9−δ, and magnetic ordering for Sr1.92Ca1.08Fe2.04W0.96O9−δ. The isomer shift (δ) and quadrupole splitting (Δ) values are characteristic of high-spin Fe3+ in a distorted octahedral coordination. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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