• Mezaoui, Djillali
• Lepore, Giovanni Orazio
• Benedetto, Francesco Di
• Bonazzi, Paola
• Bolli, Eleonora
• Goudjil, Meriem
• Bindi, Luca
• Mezzi, Alessio

Abstract

<jats:title>Abstract</jats:title><jats:p>A new compound, K<jats:sub>5</jats:sub>[(Mo<jats:sub>3.2</jats:sub>W<jats:sub>1.8</jats:sub>)O<jats:sub>11</jats:sub>](PO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub>[(P<jats:sub>0.5</jats:sub>Mo<jats:sub>0.5</jats:sub>)O<jats:sub>4</jats:sub>], was synthesized via solid-state reaction and its crystal structure was determined by single-crystal X-ray diffraction. This compound crystallizes in the space group <jats:italic>Pnma</jats:italic>, with <jats:italic>a</jats:italic> = 9.0360(4) Å, <jats:italic>b</jats:italic> = 10.1603(4) Å, <jats:italic>c</jats:italic> = 26.1538(12) Å and <jats:italic>V</jats:italic> = 2401.14(18) Å<jats:sup>3</jats:sup>. The structure consists of a corner-sharing MO<jats:sub>6</jats:sub>–TO<jats:sub>4</jats:sub> (M = Mo, W; T = P, Mo) polyhedral connection arranged to form an ordered packing of ∼14.9 Å-thick layers parallel to (001). The stacking of the layers forms trigonal, tetragonal and hexagonal channels. XPS study reveals the presence of W at the hexavalent state only, whereas Mo appears as a mixed-valent species (Mo<jats:sup>6+</jats:sup>, Mo<jats:sup>5+</jats:sup> and Mo<jats:sup>4+</jats:sup>). Magnetic susceptibility reveals the occurrence of a relevant antiferromagnetic coupling and is consistent with the presence of reduced metal species as indicated by the XPS results.</jats:p>

Topics

• impedance spectroscopy
• compound
• molybdenum
• x-ray diffraction
• x-ray photoelectron spectroscopy
• layered
• Potassium
• susceptibility
• tungsten
• space group