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Ehre, David
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Publications (8/8 displayed)
- 2024Local Environment of Sc and Y Dopant Ions in Aluminum Nitride Thin Filmscitations
- 2024A Gd-doped ceria/TiOx nanocomposite as the active layer in a three terminal electrochemical resistivity switch.citations
- 2022C-Axis Textured, 2–3 μm Thick Al0.75Sc0.25N Films Grown on Chemically Formed TiN/Ti Seeding Layers for MEMS Applicationscitations
- 2021Local Piezoelectric Properties of Doped Biomolecular Crystalscitations
- 2020Surface Piezoelectricity and Pyroelectricity in Centrosymmetric Materials: A Case of α-Glycinecitations
- 2016CH3NH3PbBr3 is not pyroelectric, excluding ferroelectric-enhanced photovoltaic performancecitations
- 2008X-ray photoelectron spectroscopy of amorphous and quasiamorphous phases of BaTi O3 and SrTi O3citations
- 2007Structural transformations during formation of quasi-amorphous BaTiO 3citations
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article
X-ray photoelectron spectroscopy of amorphous and quasiamorphous phases of BaTi O3 and SrTi O3
Abstract
<p>Nonpolar amorphous and polar quasiamorphous phases of substrate-supported BaTi O3 and SrTi O3 were studied with x-ray photoelectron spectroscopy (XPS) to characterize the structural and chemical changes accompanying the transformation of the former into the latter. It was found that there are two spectral features distinguishing the amorphous from the quasiamorphous films: (1) an extra peak in the valence band spectra of amorphous films and (2) a satellite line in the XPS O 1s spectra of the amorphous films. On the basis of literature data, we suggest that both these features may be interpreted as originating from an oxygen-oxygen chemical bond. During the thermally driven transformation of an amorphous into a polar quasiamorphous phase, the oxygen-oxygen chemical bond breaks, leading to volume expansion and the development of inhomogeneous in-plane mechanical stress.</p>