Dewi, R.; Manalu, W. A.; Asrinaldo, B. N.; Rini, A. S.; Yanuar, Y. CHARACTERIZATION OF ENERGY BAND GAP THIN FILM BaTiO3 – BaZr0.5Ti0.5O3 USING DIFUSION REFLECTANCE SPECTROSCOPY (DRS) METHOD. SPEKTRA 2023, 8, 17-24.