Synthesis and Characterization of -Titanium Phosphate/Propylamine Intercalation Compounds Containing Transition-Metal Ions
Polycrystalline intercalated TiMxH2-nx(PO4)2·yC3H7NH2·wH2O compounds with transition metal (TM) ions (Mn+ = Co2+, Ni2+, Fe3+ or Cr3+) have been prepared by means of an indirect route and characterised using X-ray diffraction, scanning electron microscopy, chemical and thermal analysis, X-ray absorpt...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2005 |
| País: | España |
| Institución: | Universidad de Oviedo (UNIOVI) |
| Repositorio: | RUO. Repositorio Institucional de la Universidad de Oviedo |
| Idioma: | inglés |
| OAI Identifier: | oai:digibuo.uniovi.es:10651/51265 |
| Acceso en línea: | http://hdl.handle.net/10651/51265 https://dx.doi.org/10.1002/zaac.200570036 |
| Access Level: | acceso abierto |
| Palabra clave: | Layered phosphates Intercalation Transition metals Ion exchange |
| Sumario: | Polycrystalline intercalated TiMxH2-nx(PO4)2·yC3H7NH2·wH2O compounds with transition metal (TM) ions (Mn+ = Co2+, Ni2+, Fe3+ or Cr3+) have been prepared by means of an indirect route and characterised using X-ray diffraction, scanning electron microscopy, chemical and thermal analysis, X-ray absorption and magnetic measurements. These novel pillared layered materials, which were obtained from the monoclinic (P21/c space group) alpha-Ti(HPO4)2·H2O phase, lose its crystallinity after intercalation. However, all the TM ions are octahedrally surrounded by 6 oxygen atoms, although the X-ray absorption spectra evidence a clear dependence on the temperature. Surprisingly, all the materials behave as paramagnetic down to 1.5 K, but they exhibit different colors, which means that they are optically active (Co2+: violet; Ni2+: pale green; Fe3+: yellow; Cr3+: dark green). |
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