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]

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

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 >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Submission date :

2023-03-09T01:23:27Z
2023-03-24T14:53:31Z