Extended Data Figure 1 : Ferroelectric and dielectric data.

From: Perovskite oxides for visible-light-absorbing ferroelectric and photovoltaic materials

Extended Data Figure 1

a, Dielectric data for x = 0.1–0.4 KBNNO. Two dielectric anomalies (arrows) at about 450 K and about 600 K are present (solid lines indicate heating; dotted lines indicate cooling). b, Ferroelectric hysteresis loops at 77 K, showing the effect of increasing the maximum poling voltage. c, Ferroelectric hysteresis loop for approximately 20-μm-thick x = 0.1 KBNNO film at 170–200 K. d, Ferroelectric hysteresis loop for approximately 20-μm-thick x = 0.1 KBNNO film at 300 K.