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Synthesis of new Ln4(Al2O6F2)O2 (Ln = Sm, Eu, Gd) phases with a cuspidine-related structure.
Morán-Ruiz, Aroa; Wain-Martin, Aritza; Orera, Alodia; Sanjuán, María Luisa; Larrañaga, Aitor; Slater, Peter R; Arriortua, Maribel.
Afiliación
  • Morán-Ruiz A; Universidad del País Vasco (UPV/EHU), Facultad de Ciencia y Tecnología, Barrio Sarriena S/N, Leioa, Vizcaya 48940, Spain.
  • Wain-Martin A; Universidad del País Vasco (UPV/EHU), Facultad de Ciencia y Tecnología, Barrio Sarriena S/N, Leioa, Vizcaya 48940, Spain.
  • Orera A; Instituto de Ciencia de Materiales de Aragón (CSIC - Universidad de Zaragoza), C/ Pedro Cerbuna 12, Zaragoza 50009, Spain.
  • Sanjuán ML; Instituto de Ciencia de Materiales de Aragón (CSIC - Universidad de Zaragoza), C/ Pedro Cerbuna 12, Zaragoza 50009, Spain.
  • Larrañaga A; Universidad del País Vasco (UPV/EHU), Facultad de Ciencia y Tecnología, Barrio Sarriena S/N, Leioa, Vizcaya 48940, Spain.
  • Slater PR; University of Birmingham, School of Chemistry, Birmingham B15 2TT, UK.
  • Arriortua M; Universidad del País Vasco (UPV/EHU), Facultad de Ciencia y Tecnología, Barrio Sarriena S/N, Leioa, Vizcaya 48940, Spain.
IUCrJ ; 6(Pt 1): 128-135, 2019 Jan 01.
Article en En | MEDLINE | ID: mdl-30713710
The first fluorination of the cuspidine-related phases of Ln4(Al2O7□)O2 (where Ln = Sm, Eu, Gd) is reported. A low-temperature reaction with poly(vinyl-idene difluoride) lead to the fluorine being substituted in place of oxygen and inserted into the vacant position between the dialuminate groups. X-ray photoelectron spectroscopy shows the presence of the F 1s photoelectron together with an increase in Al 2p and rare-earth 4d binding energies supporting F incorporation. Energy-dispersive X-ray spectroscopy analyses are consistent with the formula Ln4(Al2O6F2)O2, confirming that substitution of one oxygen by two fluoride atoms has been achieved. Rietveld refinements show an expansion in the cell upon fluorination and confirm that the incorporation of fluoride in the Ln4(Al2O7□)O2 structure results in changes in Al coordination from four to five. Thus, the isolated tetrahedral dialuminate Al2O7 groups are converted to chains of distorted square-based pyramids. These structural results are also discussed based on Raman spectra.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: IUCrJ Año: 2019 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: IUCrJ Año: 2019 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido