Structure and dielectric response of (1–x)NaNO2 + xBaTiO3 composites at x = 0.05 and 0.1

Abstract

The (1–x)NaNO₂ + xBaTiO₃ composites of two compositions (x = 0.05 and 0.1) have been studied by powder neutron diffraction and broadband dielectric spectroscopy (frequency region 10^–1–10⁷ Hz). The temperature dependences of the ferroelectric order parameter of NaNO₂ in the composites and pure NaNO₂ have been measured. The frequency dependences of the real and imaginary parts of the permittivities of the composites and pure NaNO₂ have been analyzed in the temperature range 25–187°C. The anomaly of the dielectric response observed at T ~ 147°C is assumed to be related to the processes of accumulation and “resolution” of charges at the BaTiO₃ particle boundaries.