Author/Authors :
Frigui, Wafa Université de Tunis EL Manar - Faculté des Sciences de Tunis - Laboratoire de Matériaux et Cristallochimie, Tunisie , Ben Amor, Fatma Université de Tunis EL Manar - Faculté des Sciences de Tunis - Laboratoire de Matériaux et Cristallochimie, Tunisie , Zid, Mohamed F. Université de Tunis EL Manar - Faculté des Sciences de Tunis - Laboratoire de Matériaux et Cristallochimie, Tunisie , Madani, Adel Université 7 Novembre-Carthage - Faculté des Sciences de Bizerte - Laboratoire de Physique des Matériaux, Tunisie , Driss, Ahmed Université de Tunis EL Manar - Faculté des Sciences de Tunis - Laboratoire de Matériaux et Cristallochimie, Tunisie
Abstract :
The title compound crystallizes in monoclinic system P21/c. The parameters of the unitcell are: a=6.856(5)Å; b=13.070(5)Å; c=11.370(2)Å; β=98.63(3)°; V=1007.2(5)Å^3 and Z=4. Theanionic framework of the compound is built up from infinite layers linked together by Mn-As-Obridges and by edge-sharing MnO6 octahedra to form a three dimensional framework having two kinds of tunnels. The first one, containing K^+ cations, is parallel to the a axis and the second one containing Na^+ cations is parallel to [001] direction. Complementary infrared (IR) and complex impedance (CI) spectroscopies studies were carried out.
Keywords :
Unit cell , Anionic framework , Tunnels , IR and CI spectroscopies
