NDLI: Synthesis, crystal structure, sintering and electrical properties of a new alluaudite-like triple molybdate K0.13Na3.87MgMo3O12

Content Provider	Royal Society of Chemistry (RSC)
Author	Boughazala, Habib Ennajeh, Ines Zid, Mohamed Faouzi Georges, Samuel Smida, Youssef Ben Guesmi, Abderrahmen
Copyright Year	2015
Abstract	A new triple molybdate K0.13Na3.87MgMo3O12 was synthesized by solid state reaction. The crystal structure has been determined by single X-ray diffraction and the electrical conductivity measured by impedance spectroscopy. The title compound crystallizes in the monoclinic space group C2/c with a = 12.9325 (8) Å, b = 13.5537 (9) Å, c = 7.1627 (6) Å, β = 112.212 (9)°, V = 1162.33 (14) Å3 and Z = 4. The final agreement factors are R = 0.0241, wR (F2) = 0.0584, S(F2) = 1.22. The magnesium–molybdate 3D-framework belongs to the alluaudite type. The structure is formed by infinite chains composed of edge-sharing (Mg/Na)2O10 dimmers, which are linked together via bridging MoO4 tetrahedra, yielding to a three-dimensional framework enclosing two distinct types of hexagonal tunnels in which Na+ and K+ cations reside. The structural model is validated by bond valence sum (BVS) and charge distribution (CD) methods. Ball milling is used as mechanical means to reduce the particles sizes of the synthesized powder. At the optimal sintering temperature of 650 °C, a relative density of 81% was obtained. The microstructures were characterized by scanning electron microscopy. The compound undergoes a phase transformation at 528 °C accompanied by an abrupt increase of the electrical conductivity. Above this phase transition, the electrical conductivity reaches 10−2 S cm−1. Thus K0.13Na3.87Mg(MoO4)3 may be considered as a promising compound for developing new materials with high ionic conductivity.
Starting Page	38918
Ending Page	38925
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	49
Journal	RSC Advances
DOI	10.1039/c5ra02276b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Tetrahedron Monoclinic crystal system Molybdate Scanning electron microscope X-ray crystallography Electrical resistivity and conductivity Sintering Bond valence method Alluaudite BVS Space group Electrical impedance Phase transition
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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