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Effect of Sodium and Fluorine Co‐Doping on the Properties of Fluorite‐Like Rare‐Earth Molybdates of Nd 5 Mo 3 O 16 Type
Author(s) -
Voronkova Valentina,
Kharitonova Elena,
Orlova Ekaterina,
Kežionis Algimantas,
Petrulionis Dalius
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201801511
Subject(s) - chemistry , fluorite , conductivity , fluorine , inorganic chemistry , doping , solid solution , oxide , analytical chemistry (journal) , crystallography , condensed matter physics , organic chemistry , chromatography , physics
Fluorite‐like oxyfluorides NaLn 4 Mo 3 O 15 F (Ln = La, Pr, Nd), which relate to the Nd 5 Mo 3 O 16 structural type, were obtained by solid‐phase synthesis in the air. Codoping of the Nd 5 Mo 3 O 16+ δ family with sodium and fluorine led to the appearance of a piezoelectric effect and a reversible phase transition in oxyfluorides, accompanied by a jump in the conductivity and an anomaly of the permittivity of the ferroelectric type. It is assumed that the compounds NaLn 4 Mo 3 O 15 F in contrast to Nd 5 Mo 3 O 16+ δ , which possess mixed oxide‐ion/electronic interstitial conductivity, can have oxygen conductivity of vacancy type. The highest conductivity offered by these materials is 3.2 × 10 –2 S/cm at 700 °C. NaLn 4 Mo 3 O 15 F compounds were found to be hygroscopic and can be considered as potential proton conductors.