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6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on BaBiO3 by Materials Project

BaBiO3 is (Cubic) Perovskite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ba is bonded to twelve equivalent O atoms to form BaO12 cuboctahedra that share corners with twelve equivalent BaO12 cuboctahedra, faces with six equivalent BaO12 cuboctahedra, and faces with eight BiO6 octahedra. All Ba–O bond lengths are 3.13 Å. There are two inequivalent Bi sites. In the first Bi site, Bi is bonded to six equivalent O atoms to form BiO6 octahedra that share corners with six equivalent BiO6 octahedra and faces with eight equivalent BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–O bond lengths are 2.16 Å. In the second Bi site, Bi is bonded to six equivalent O atoms to form BiO6 octahedra that share corners with six equivalent BiO6 octahedra and faces with eight equivalent BaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Bi–O bond lengths are 2.27 Å. O is bonded to four equivalent Ba and two Bi atoms to form a mixture of distorted face, edge, and corner-sharing OBa4Bi2 octahedra. The corner-sharing octahedra tilt angles range from 0–60°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaBiO3 by Materials Project

BaBiO3 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Ba is bonded in a 3-coordinate geometry to nine equivalent O atoms. There are a spread of Ba–O bond distances ranging from 2.75–3.15 Å. There are two inequivalent Bi sites. In the first Bi site, Bi is bonded to six equivalent O atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles are 20°. All Bi–O bond lengths are 2.17 Å. In the second Bi site, Bi is bonded to six equivalent O atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles are 20°. All Bi–O bond lengths are 2.31 Å. O is bonded in a 5-coordinate geometry to three equivalent Ba and two Bi atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaBiO3 by Materials Project

BaBiO3 is Orthorhombic Perovskite structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ba is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Ba–O bond distances ranging from 2.75–3.29 Å. There are two inequivalent Bi sites. In the first Bi site, Bi is bonded to six O atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedra tilt angles range from 19–23°. All Bi–O bond lengths are 2.17 Å. In the second Bi site, Bi is bonded to six O atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedra tilt angles range from 19–23°. There are two shorter (2.31 Å) and four longer (2.32 Å) Bi–O bond lengths. There are three inequivalent O sites. In the first O site, O is bonded in a 5-coordinate geometry to three equivalent Ba and two Bi atoms. In the second O site, O is bonded in a 5-coordinate geometry to three equivalent Ba and two Bi atoms. In the third O site, O is bonded in a 5-coordinate geometry to three equivalent Ba and two Bi atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaBiO3 by Materials Project

BaBiO3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ba–O bond distances ranging from 2.60–2.93 Å. In the second Ba site, Ba is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ba–O bond distances ranging from 2.65–2.92 Å. There are two inequivalent Bi sites. In the first Bi site, Bi is bonded in a 2-coordinate geometry to three O atoms. There are a spread of Bi–O bond distances ranging from 2.24–2.66 Å. In the second Bi site, Bi is bonded in an L-shaped geometry to three O atoms. There are a spread of Bi–O bond distances ranging from 2.09–2.89 Å. There are six inequivalent O sites. In the first O site, O is bonded to three Ba and one Bi atom to form OBa3Bi tetrahedra that share corners with two equivalent OBa3Bi tetrahedra, corners with three equivalent OBa3BiO trigonal bipyramids, a cornercorner with one OBa2BiO trigonal pyramid, an edgeedge with one OBa3BiO trigonal bipyramid, and an edgeedge with one OBa2BiO trigonal pyramid. In the second O site, O is bonded in a 5-coordinate geometry to three Ba, one Bi, and one O atom. The O–O bond length is 1.48 Å. In the third O site, O is bonded in a 3-coordinate geometry to one Ba, one Bi, and one O atom. The O–O bond length is 1.48 Å. In the fourth O site, O is bonded to two Ba, one Bi, and one O atom to form OBa2BiO trigonal pyramids that share a cornercorner with one OBa3Bi tetrahedra, corners with two equivalent OBa3BiO trigonal bipyramids, an edgeedge with one OBa3Bi tetrahedra, and an edgeedge with one OBa3BiO trigonal bipyramid. In the fifth O site, O is bonded to three Ba, one Bi, and one O atom to form distorted OBa3BiO trigonal bipyramids that share corners with three equivalent OBa3Bi tetrahedra, corners with two equivalent OBa3BiO trigonal bipyramids, corners with two equivalent OBa2BiO trigonal pyramids, an edgeedge with one OBa3Bi tetrahedra, and an edgeedge with one OBa2BiO trigonal pyramid. In the sixth O site, O is bonded in a 3-coordinate geometry to two Ba and one Bi atom.

36 MATERIALS SCIENCE↗
DOE OSTI2023

A hybrid Monte Carlo study of bond-stretching electron–phonon interactions and charge order in BaBiO3

Abstract The relationship between electron–phonon ( e -ph) interactions and charge-density-wave (CDW) order in the bismuthate family of high-temperature superconductors remains unresolved. We address this question using nonperturbative hybrid Monte Carlo calculations for the parent compound BaBiO 3 . Our model includes the Bi 6 s and O 2 p σ orbitals and coupling to the Bi-O bond-stretching branch of optical phonons via modulations of the Bi-O hopping integral. We simulate three-dimensional clusters of up to 4000 orbitals, with input model parameters taken from ab initio electronic structure calculations and a phonon energy ℏΩ 0 = 60 meV. Our results demonstrate that the coupling to the bond-stretching modes is sufficient to reproduce the CDW transition in this system, despite a relatively small dimensionless coupling. We also find that the transition deviates from the weak-coupling Peierls’ picture. This work demonstrates that off-diagonal e -ph interactions in orbital space are vital in establishing the bismuthate phase diagram.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2021

Realization of Electron Antidoping by Modulating the Breathing Distortion in BaBiO 3

The recent proposal of antidoping scheme breaks new ground in conceiving conversely functional materials and devices; yet, the few available examples belong to the correlated electron systems. Here, we demonstrate both theoretically and experimentally that the main group oxide BaBiO 3 is a model system for antidoping using oxygen vacancies. The first-principles calculations show that the band gap systematically increases due to the strongly enhanced Bi-O breathing distortions away from the vacancies and the annihilation of Bi 6 s /O 2 p hybridized conduction bands near the vacancies. Our further spectroscopic experiments confirm that the band gap increases systematically with electron doping, with a maximal gap enhancement of ~75% when the film's stoichiometry is reduced to BaBiO 2.75 . These results unambiguously demonstrate the remarkable antidoping effect in a material without strong electron correlations and underscores the importance of bond disproportionation in realizing such an effect.

79 ASTRONOMY AND ASTROPHYSICS↗