Fig. 8. Temperature dependency of dielectric constant (ε′) and dielectric loss factor (tan δ) at 5 kHz–1 MHz of (a) and (f) BTN-2; (b) and (g) BLTNF-2.5; (c) and (h) BLTNF-3; (d) and (i) BLTNF-3.5; and (e) and (j) BTF-4 samples.