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Crystalline and vitreous Na3.89Ca0.67Al0.23Ti0.77(PO4)3 : Synthesis, crystal structure, vibrational and UV–Visible spectra

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  • معلومة اضافية
    • Contributors:
      University Hassan II Casablanca; Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB); Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); Science et Ingénierie des Matériaux et Procédés (SIMaP); Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP); Université Grenoble Alpes (UGA); Institut des Sciences Moléculaires (ISM); Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1 (UB)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); The CNRST/Morocco - CNRS/France (Agreement No. 24494) and the Volubilis Committee (Integrated Action No. MA/10/229) for their financial support.
    • بيانات النشر:
      HAL CCSD
      Elsevier
    • الموضوع:
      2023
    • Collection:
      Université Grenoble Alpes: HAL
    • نبذة مختصرة :
      International audience ; Na3.89Ca0.67Al0.23Ti0.77(PO4)3 phosphate exists in both crystalline and vitreous forms. It has been synthesized as microcrystalline powder, single crystals and glass. The structure of the crystalline form, belonging to Nasicon family with M(1)M(2)3A2(PO4)3 formula, was solved by single crystal X-ray diffraction (Space group R32, Z = 6, ah = 8.9976(1) Å, ch = 21.8312(3) Å, R1 = 0.03, wR2 = 0.06). A Rietveld refinement was also performed. The structure is formed by a 3D network of PO4 tetrahedra and AO6 (A= Na/Ca and Al/Ti) octahedra sharing corners. One of the two positions of A sites is statistically occupied by Na+ and Ca2+, the other position is statistically occupied by Al3+ and Ti4+. The remaining sodium atoms occupy totally M(1) and partially M(2) interstitial sites. Raman and infrared spectra show for the crystalline powder, broad peaks attributed principally to monophosphate PO4 modes. The structure of the glass contains PO4 and P2O7 groups and short -Ti-O-Ti-O- chains. UV–Visible spectra consist of strong bands at high energy assigned to O-Ti and O-Al electronic charge transfers.
    • الرقم المعرف:
      10.1016/j.molstruc.2023.135129
    • الدخول الالكتروني :
      https://hal.science/hal-04320865
      https://hal.science/hal-04320865v1/document
      https://hal.science/hal-04320865v1/file/2023-028_tap.pdf
      https://doi.org/10.1016/j.molstruc.2023.135129
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.C0D785AA