Funct. Mater. 2017; 24 (4): 559-562.

doi:https://doi.org/10.15407/fm24.04.559

Electret properties of Ca5Nb4TiO17 with five-layered perovskite-like structure

Y.O.Titov1, M.S.Slobodyanik1, N.M.Belyavina1, O.I.Nakonechna1, V.V.Chumak2, R.M.Kuzmin1

1T.Shevchenko National University of Kyiv, 64/13 Volodymyrska Str., 01601 Kyiv, Ukraine
2I.Franko State University of Zhytomyr, 40 Velyka Berdychivska Str., 10008 Zhytomyr, Ukraine

Abstract: 

It is found that ceramic thermoelectret based on Ca5Nb4TiO17 with five-layered slab perovskite-like structure is characterized by high values of potential external electric field VS which demonstrates enchanced stability in time both under normal and high humidity conditions. In particular, the initial value VSo of the surface potential for Ca5Nb4TiO17 polarized ceramics (Fpol. = 15 kV/cm, Tpol. = 493 K, τpol. = 2 h) is equal to 480 V, the decreasing of VS/VSo under normal conditions does not exceed 20 % for 316 days and under 100 % of humidity reaches 73 % for 7 days.

Keywords: 
ceramic thermoelectret, compounds with slab perovskite-like structure.

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References: 

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