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Comptes Rendus Chimie
Volume 15, n° 7
pages 603-608 (juillet 2012)
Doi : 10.1016/j.crci.2012.05.007
Received : 12 December 2011 ;  accepted : 9 May 2012
Crystal structure and ionic conductivity of AgCr2 (PO4 )(P2 O7 )
 

Brahim Ayed
Laboratoire de matériaux et cristallochimie, département de chimie, faculté des sciences, Monastir, Tunisia 

Abstract

Single crystals of a new phosphate AgCr2 (PO4 )(P2 O7 ) have been prepared by the flux method and its structural and the infrared spectrum have been investigated. This compound crystallizes in the monoclinic system with the space group C2/c and the parameters are, a =11.493 (3) Å, b =8.486 (3) Å, c =8.791 (2) Å, β=114.56 (2)°, V =779.8 (3) Å3and Z =4. Its structure consists of CrO6 octahedra sharing corners with P2 O7 units to form undulating chains extending infinitely along the [110] direction. These chains are connected by the phosphate tetrahedra giving rise to a 3D framework with six-sided tunnels parallel to the [101] direction, where the Ag+ ions are located. The infrared spectrum of this compound was interpreted on the basis of P2 O7 4− and PO4 3− vibrations. The appearance of νs P–O–P in the spectrum suggests a bent P–O–P bridge for the P2 O7 4− ions in the compound, which is in agreement with the X-ray data. The electrical measurements allow us to obtain the activation energy of (1.36eV) and the conductivity measurements suggest that the charge carriers through the structure are the silver captions.

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Keywords : Crystal growth, IR spectroscopy, X-ray diffraction, Structure




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