Fig. 4: Ferroelectric properties, breakdown analysis, and complex impedance properties, along with relaxation behavior of NN and (1-x)NN-xBNH ceramics.

a Unipolar P-E loops at 250 kV▪cm−1. b Room temperature P-E loop measured till the critical electric field of x = 0.15 (RRP) ceramic. c Weibull distribution of the breakdown strength on ceramic samples. d Arrhenius plots of total electric conductivity. e Temperature and frequency-dependence dielectric spectra. f Raman spectra at room temperature.