Two novel phosphates Na2Mg2Fe(PO4)(3) and ...
Document type :
Article dans une revue scientifique: Article original
Permalink :
Title :
Two novel phosphates Na2Mg2Fe(PO4)(3) and Ag2Mg2Fe(PO4)(3) with alluaudite structure: Synthesis, crystal structure and electrical properties
Author(s) :
Saleck, Ahmed Ould [Auteur]
Mercier, Cyrille [Auteur]
Follet-Houttemane, Claudine [Auteur]
Assani, Abderrazzak [Auteur]
Saadi, Mohamed [Auteur]
Capoen, Edouard [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
El Ammari, Lahcen [Auteur]
Mercier, Cyrille [Auteur]
Follet-Houttemane, Claudine [Auteur]
Assani, Abderrazzak [Auteur]
Saadi, Mohamed [Auteur]
Capoen, Edouard [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
El Ammari, Lahcen [Auteur]
Journal title :
Journal of Solid State Chemistry
Abbreviated title :
J. Solid State Chem.
Volume number :
312
Pages :
123139
Publisher :
Elsevier
Publication date :
2022-08
ISSN :
0022-4596
English keyword(s) :
Phosphate
Alluaudite
Crystal structure
Solid-state reaction
X-ray diffraction
Ionic conductivity
Alluaudite
Crystal structure
Solid-state reaction
X-ray diffraction
Ionic conductivity
HAL domain(s) :
Chimie
English abstract : [en]
Single crystals and powders of the orthophosphates A2Mg2Fe(PO4)3 with A = Na+ or Ag+ have been synthesized by solid-state reaction. The X-ray diffraction diagrams of Na2Mg2Fe(PO4)3 and Ag2Mg2Fe(PO4)3 were refined by ...
Show more >Single crystals and powders of the orthophosphates A2Mg2Fe(PO4)3 with A = Na+ or Ag+ have been synthesized by solid-state reaction. The X-ray diffraction diagrams of Na2Mg2Fe(PO4)3 and Ag2Mg2Fe(PO4)3 were refined by pattern matching method. The two compounds crystallize in C2/c space group adopting the alluaudite type structure. Refinement of the crystal structure of the silver-containing compound leads to the non-stoichiometric chemical formula Ag1·67Mg2·33Fe0·89(PO4)3 while that of the sodium-containing compound leads to the stoichiometric chemical formula Na2Mg2Fe(PO4)3. The complex impedance plots are obtained in frequency range from 0.1 Hz to 1 MHz, between 573 K and 823 K Na2Mg2Fe(PO4)3 presents a conductivity of 0.25 × 10−5 S cm−1 at 773 K, with Ea = 0.81 eV. For Ag2Mg2Fe(PO4)3, a better ionic conductivity of 1.8 × 10−3 S cm−1 has been observed at the same temperature with Ea = 0.47 eV. The two alluaudite compounds present an intrinsic cationic conductivity type resulting from Na+ or Ag+ ions movement.Show less >
Show more >Single crystals and powders of the orthophosphates A2Mg2Fe(PO4)3 with A = Na+ or Ag+ have been synthesized by solid-state reaction. The X-ray diffraction diagrams of Na2Mg2Fe(PO4)3 and Ag2Mg2Fe(PO4)3 were refined by pattern matching method. The two compounds crystallize in C2/c space group adopting the alluaudite type structure. Refinement of the crystal structure of the silver-containing compound leads to the non-stoichiometric chemical formula Ag1·67Mg2·33Fe0·89(PO4)3 while that of the sodium-containing compound leads to the stoichiometric chemical formula Na2Mg2Fe(PO4)3. The complex impedance plots are obtained in frequency range from 0.1 Hz to 1 MHz, between 573 K and 823 K Na2Mg2Fe(PO4)3 presents a conductivity of 0.25 × 10−5 S cm−1 at 773 K, with Ea = 0.81 eV. For Ag2Mg2Fe(PO4)3, a better ionic conductivity of 1.8 × 10−3 S cm−1 has been observed at the same temperature with Ea = 0.47 eV. The two alluaudite compounds present an intrinsic cationic conductivity type resulting from Na+ or Ag+ ions movement.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois
CNRS
Centrale Lille
ENSCL
Univ. Artois
Collections :
Submission date :
2023-03-09T01:23:27Z
2023-03-24T14:53:31Z
2023-03-24T14:53:31Z