Rare-Earth Fluorite-like Li0.42La4.58Mo3O15.76±δF0.42±ε Molybdates: Crystal Growth and Atomic Structure

Rare-earth fluorine-containing molybdates of the Ln5Mo3O16+δ oxygen–electron conductor family with the LiLa4Mo3O15F composition were synthesized for the first time as single crystals by the flux method. An accurate X-ray diffraction analysis of the obtained crystals was carried out at 20 and −183 °C. The LiLa4Mo3O15F compound is isostructural to the fluorine-free analogue with a cubic structure (space group Pn3¯n). It is shown that lithium atoms replace one of the two positions of lanthanum in the more distorted LaO8 polyhedron. According to X-ray diffraction analysis, fluorine atoms replace the positions of over-stoichiometric oxygen located in the vast cavities of the structure. So, fluorine anions can promote the interstitial conductivity of F-containing LiLa4Mo3O15F molybdates.

[1]  N. Lyskov,et al.  Proton Conductivity in Rare-Earth Fluorine-Containing Molybdates NaLn_4Mo_3O_15F , 2023, Russian Journal of Electrochemistry.

[2]  N. Gorshkov,et al.  Fluorite‐like Li x Ln 5– x Mo 3 O 16.5–1.5 x F x , 2020 .

[3]  N. Tarasova Effect of fluorine doping on the ionic (O2−, H+) conductivity of oxygen-deficient complex oxides , 2020, Russian Chemical Bulletin.

[4]  E. Kharitonova,et al.  Effect of Sodium and Fluorine Co-Doping on the Properties of Fluorite-Like Rare-Earth Molybdates of Nd5 Mo3 O16 Type , 2019, European Journal of Inorganic Chemistry.

[5]  E. Antipov,et al.  Pr5Mo3O16 + δ: A New Anode Material for Solid Oxide Fuel Cells , 2018, Russian Journal of Inorganic Chemistry.

[6]  V. Artemov,et al.  Structure of Nd5Mo3O16 + δ Single Crystals Doped with Tungsten , 2018 .

[7]  S. Hull,et al.  The Fluorite-Like Phase Nd5Mo3O16±δ in the MoO3-Nd2O3 System: Synthesis, Crystal Structure, and Conducting Properties. , 2018, Inorganic chemistry.

[8]  E. Kharitonova,et al.  Synthesis and Electrical Properties of a Fluorite-Like Nd5Mo3O16 Compound with Partial Substitution of Molybdenum by Tungsten, Niobium, or Vanadium , 2018 .

[9]  A. Levchenko,et al.  Ca-doped fluorite-like compounds based on Nd5Mo3O16 , 2016 .

[10]  E. Suard,et al.  Crystal structure and ion conducting properties of La 5 NbMo 2 O 16 , 2016 .

[11]  V. L. Kozhevnikov,et al.  Oxygen ion and electron conductivity in fluorite-like molybdates Nd5Mo3O16 and Pr5Mo3O16 , 2014 .

[12]  V. Petříček,et al.  Crystallographic Computing System JANA2006: General features , 2014 .

[13]  I. Verin,et al.  Single-crystal structure of vanadium-doped Nd5Mo3O16 , 2014 .

[14]  V. Artemov,et al.  Crystal structure of the oxygen conducting compound Nd5Mo3O16 , 2012 .

[15]  J. Alonso,et al.  Preparation and structural study from neutron diffraction data of Pr5Mo3O16 , 2010 .

[16]  L. Palatinus Ab initio determination of incommensurately modulated structures by charge flipping in superspace. , 2004, Acta crystallographica. Section A, Foundations of crystallography.

[17]  M. Greenblatt,et al.  Oxide ion conductivity in Ln5Mo3O16+x) (Ln = La, Pr, Nd, Sm, Gd; x .apprx. 0.5) with a fluorite-related structure , 1989 .

[18]  Evans,et al.  STANDARD X-RAY DIFFRACTION POWDER PATTERNS , 1962 .