Dimorphism in iron(II) methylphosphonate: Low-temperature crystal structure and temperature-dependent Mössbauer studies of a new form of the layered weak ferromagnet Fe[(CH3PO3)(H2O)]
| Autor: | Carlo Bellitto, Alain Meerschaut, Guido Righini, Elvira M. Bauer, Pierre Palvadeau, Kamal Boubekeur, Philippe Leone, Pavel B. Fabritchnyi |
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| Rok vydání: | 2005 |
| Předmět: |
Mössbauer spectroscopy
Chemistry Crystal structure Space group Quadrupole splitting Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Crystal Crystallography Nuclear magnetic resonance Materials Chemistry Ceramics and Composites Iron phosphonate Orthorhombic crystal system Physical and Theoretical Chemistry Polymorphs Hyperfine structure |
| Zdroj: | Journal of solid state chemistry 178 (2005): 1125–1132. doi:10.1016/j.jssc.2005.01.020 info:cnr-pdr/source/autori:Léone P., Palvadeau P., Boubekeur K., Meerschaut A., Bellitto C., Bauer E.M., Righini G., Fabritchnyi P./titolo:Dimorphism in Iron(II) methylphosphonate: Low-Temperature Crystal Structure and Temperature dependent Mössbauer Studies of a New Form of the Layered Weak ferromagnet Fe[(CH3PO3)(H2O)]/doi:10.1016%2Fj.jssc.2005.01.020/rivista:Journal of solid state chemistry (Print)/anno:2005/pagina_da:1125/pagina_a:1132/intervallo_pagine:1125–1132/volume:178 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2005.01.020 |
| Popis: | A second form of the literature-known layered weak ferromagnet Fe[(CH3PO3)(H2O)] has been isolated. The crystal structure determination of this new form (2) has been carried out at T = 300 , 200 and 130 K. It crystallizes in the orthorhombic space group Pmn21: a = 5.7177 ( 11 ) , b = 8.8093 ( 18 ) , c = 4.8154 ( 10 ) A , while form (1) crystallizes in the space group Pna21: a = 17.58 ( 2 ) , b = 4.814 ( 1 ) , c = 5.719 ( 1 ) A . Mossbauer spectroscopy on form (2) has been performed in the temperature range 4–300 K; and, at T ∼ 160 K , a drastic change in the quadrupole splitting (ΔE) and a broadening of the doublet components is noticed. But surprisingly, on cooling the crystal, no structural change is observed, which could account for the increase in Δ E . Below T = 25 K , 57Fe spectra transform into hyperfine splitting patterns which reveal a magnetically ordered state in agreement with the results of earlier magnetic susceptibility studies. |
| Databáze: | OpenAIRE |
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