Effect of Sodium and Fluorine Co-Doping on the Properties of Fluorite-Like Rare-Earth Molybdates of Nd5Mo3O16 Typeстатья
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Дата последнего поиска статьи во внешних источниках: 11 апреля 2019 г.
Аннотация:Fluorite-like oxyfluorides NaLn(4)Mo(3)O(15)F (Ln = La, Pr, Nd), which relate to the Nd5Mo3O16 structural type, were obtained by solid-phase synthesis in the air. Codoping of the Nd5Mo3O16+delta 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 Nd5Mo3O16+delta, 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 x 10(-2) S/cm at 700 degrees C. NaLn(4)Mo(3)O(15)F compounds were found to be hygroscopic and can be considered as potential proton conductors.