Optical and electronic properties in ferroelectric barium titanate-based compounds [* Cross-Reference *]

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Infante, Ingrid C.; Halyna Volkova; Pascale Gémeiner; Grégory Geneste; J. Guillot; Carlos Frontera; Nidal Banja; Fabienne Karolak; Christine Bogicevic; Brahim Dkhil; Nicolas Chauvin; D. Lenoble, 2019, "Optical and electronic properties in ferroelectric barium titanate-based compounds [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.3EKIOZ, LIST Open Repository, V1
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Description
The bandgap energy values for the ferroelectric BaTiO3-based solid solutions with isovalent substitution Ba1-x SrxTiO3, BaZrxTi1-xO3 and BaSnxTi1-xO3 were determined using diffuse reflectance spectra. While the corresponding unit cell volume follows Vegard's law in accordance with the different ionic radii of the ionic substitutions, the bandgap values depict non-linear compositional dependences for all the solid solutions. The effect is considerably large for BaZrxTi1-xO3 and BaSnxTi1-xO3 solutions, depicting a bandgap linear compositional dependence up to x=0.6, for x>0.6 BaZrxTi1-xO3 compounds present much larger bandgap values than BaSnxTi1-xO3 counterparts. Electronic properties have been investigated through X-ray photoelectron spectroscopy in BaSnxTi1-xO3 compounds, indicating that the Sn 3d and Ti 2p core levels shift against the Ba 3d ones within the whole compositional range with the same energy trend as that observed for the optical bandgap. Since for Ba1-x SrxTiO3 compounds no major bandgap variation is observed, we conclude that the bandgap compositional dependences observed for BaSnxTi1-xO3 compounds and BaZrxTi1-xO3 ones are originated from the structural sensitivity of the O, Ti and Sn or Zr electronic bands involved in the bandgap transition of these compounds. With this work, we underline the reliability of the bandgap determined from diffuse reflectance spectrometry experiments, as a means to non-invasively evaluate the electronic properties of powder materials. (2019-03-18)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.48550/arxiv.1903.07443 for the original and latest version of the publication*** (2026-07-01)
Subject Engineering; Physics
Keyword Band gap, Materials science, Ionic radius, Ferroelectricity, Ionic bonding, Diffuse reflectance infrared fourier transform, Barium, X-ray photoelectron spectroscopy, Direct and indirect band gaps, Barium titanate, Analytical Chemistry (journal), Dielectric, Optoelectronics, Ion, Chemistry, Nuclear magnetic resonance, Photocatalysis
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