Investigation on the Structural, Optical, and Vibrational Properties of Lead-Free (1-$x$)Na$_{0.5}$Bi$_{0.5}$TiO$_{3-x}$BiMnO$_3$ Ceramics

1Mechanical Engineering, University of Chile, Beauchef 851, Santiago, Chile
2Department of Physics, Pukyong National University, Busan 48513, Korea
Correspondence to: Jae-Won Jang, Byung Chun Choi
Abstract
In order to control physical properties of Na$_{0.5}$Bi$_{0.5}$TiO$_3$ (NBT) perovskites, BiMnO$_3$ (BMO) was used as additive to form the (1-$x$)NBT-$x$BMO ($x$ = 0.01, 0.02, 0.03, and 0.04) powder samples with a solid-state method. As the BMO concentration increases, the regularly shaped grains are shown and the band-gap energy decreases from 3.28 to 3.17 eV. In addition, Raman spectra measured in the range from 100 to 1000 nm for the NBT-BMO powder samples showed new phonon modes and shifts to lower frequencies, which may be attributed to the incorporation of BMO into the NBT lattice.
PACS numbers: 61.43.Gt, 78.30.-j, 78.40.-q
Keywords: NBT-BMO ceramics, Band-gap tuning, Vibrational phonon mode, William-Hall plot
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