skip to main content
US FlagAn official website of the United States government
dot gov icon
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
https lock icon
Secure .gov websites use HTTPS
A lock ( lock ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.


This content will become publicly available on February 13, 2026

Title: Optical properties of BaTiO 3 at room temperature: DFT modelling
The optical properties of the tetragonal phase of BaTiO3have been studied using density functional methods, applying the generalized gradient approximation at room temperature and a hybrid functional for static lattice analysis.  more » « less
Award ID(s):
1944921
PAR ID:
10612156
Author(s) / Creator(s):
; ; ; ;
Publisher / Repository:
Royal society of Chemistry
Date Published:
Journal Name:
RSC Advances
Volume:
15
Issue:
7
ISSN:
2046-2069
Page Range / eLocation ID:
5405 to 5412
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
More Like this
  1. Density functional theory (DFT) calculations combined with cluster expansions (CE) were employed to explore the catalytic activity of stoichiometric and non-stoichiometric Cu3Au and CuAu3surfaces for CO2reduction to CO. 
    more » « less
  2. Abstract The identification of silicon‐substituted, complex organics carrying multiple functional groups by classical infrared spectroscopy is challenging because the group frequencies of functional groups often overlap. Photoionization (PI) reflectron time‐of‐fight mass spectrometry (ReTOF‐MS) in combination with temperature‐programmed desorption (TPD) holds certain advantages because molecules are identified after sublimation from the matrix into in the gas phase based on distinct ionization energies and sublimation temperatures. In this study, we reveal the detection of 1‐silaglycolaldehyde (HSiOCH2OH), 2‐sila‐acetic acid (H3SiCOOH), and 1,2‐disila‐acetaldehyde (H3SiSiHO)—the silicon analogues of the well‐known glycolaldehyde (HCOCH2OH), acetic acid (H3CCOOH), and acetaldehyde (H3CCHO), in the gas phase after preparation in silane (SiH4)–carbon dioxide ices exposed to energetic electrons and subliming the neutral reaction products formed within the ices into the gas phase. 
    more » « less
  3. Charge transfer or redistribution at oxide heterointerfaces is a critical phenomenon, often leading to remarkable properties such as two-dimensional electron gas and interfacial ferromagnetism. Despite studies on LaNiO3/LaFeO3superlattices and heterostructures, the direction and magnitude of the charge transfer remain debated, with some suggesting no charge transfer due to the high stability of Fe3+(3d5). Here, we synthesized a series of epitaxial LaNiO3/LaFeO3superlattices and demonstrated partial (up to ~0.5 e/interface unit cell) charge transfer from Fe to Ni near the interface, supported by density functional theory simulations and spectroscopic evidence of changes in Ni and Fe oxidation states. The electron transfer from LaFeO3to LaNiO3and the subsequent rearrangement of the Fe 3d band create an unexpected metallic ground state within the LaFeO3layer, strongly influencing the in-plane transport properties across the superlattice. Moreover, we establish a direct correlation between interfacial charge transfer and in-plane electrical transport properties, providing insights for designing functional oxide heterostructures with emerging properties. 
    more » « less
  4. Abstract Oxygen coordination and vacancy ordering play an important role in dictating the functionality of complex oxides. In this work, an unconventional layering of oxygen ions in a mixed conductor SrCo1‐xFexO3‐δ(SCFO) thin film grown epitaxially on SrTiO3(STO) is reported. Scanning transmission electron microscopy (STEM) reveals alternating layers of oxygen deficiency along the growth direction, with the oxygen‐rich layer correlated with the neighboring Co,Fe‐site intensity, and contraction of the Sr–Sr distance. Density functional theory (DFT) calculations and STEM image simulations support the emergence of periodic (Co,Fe)O6and (Co,Fe)O4/(Co,Fe)O5layers, an ordering that is also sensitive to the Co:Fe ratio. 
    more » « less
  5. Interatomic potentials for single-layer MoS2and MoSe2were developed by training an artificial neural network with a reference data set generated using density functional theory. 
    more » « less