SYNTHESIS AND THERMODYNAMIC PROPERTIES

OF THE NEW MONODIMENSIONAL DIPHOSPHATES

LiM1.5P2O7 (M2+= Co2+, Cu2+)

K. Rissouli1*, K. Benkhouja1, M. Touaiher1, A . Sadel1, J. Aride2,

A. Derory3, J. P. Lambour3, M. Drillon3

1 GMCM-L.P.C.M. Département de Chimie, Faculté des Sciences, Université

Chouaib Doukkali, B.P.20, El Jadida 24000 Maroc.

2L.P.C.M.,E. N. S. Takaddoum, B. P. 5118, Rabat, Maroc

3 I.P.C.M.S.,G.M.I., 23 rue du Lœss, B.P.20/CR 67037 Strasbourg Cedex France

* Corresponding author. E-mail : krissouli@caramail.com

Received 23 January 2001; revised version accepted 21 April 2001

Abstract

Two compounds in the series LiM1.5P2O7 (M2+= Co2+ or Cu2+) are isolated by solid phase and characterized by DRX and IR spectroscopy methods. The DRX spectra are similar and related to LiNi1.5P2O7. Using the Treor program, we found that both phases crystallize in a monoclinic system with P21/c space group. The magnetic susceptibility indicates the existence of an antiferromagnetic behavior at low temperature and specific heat measurements underline the low dimensionality (1D) of these pyrophosphates.

Keywords : Lithium pyrophosphates; Magnetic susceptibility; Specific heat; Low dimensionality.

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