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At least 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Supporting Data for "Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mössbauer spectroscopy"

Contents of this DOI are data for the research paper "Constraints on magnetism and correlations in RuO2 from lattice dynamics and Mossbauer spectroscopy" by the authors: George Yumnam, et. al. The dataset contains data from inelastic x-ray scattering measurements of RuO2 single crystals performed at the Advanced Photon Source in Argonne National Lab. This dataset also contains data from inelastic neutron scattering experiments of RuO2 powder performed at the ARCS spectrometer at Spallation Neutron Source at ORNL. Supporting theoretical calculations based on density functional theory with r2SCAN and DFT+U methods is also included in this dataset. Please see the README.txt files for more information of the dataset and file contents. For comments and questions, please contact: George Yumnam (yumnamg@ornl.gov) and/or Raphael P Hermann (hermannrp@ornl.gov)

density functional theory↗
DOE OSTI2026

Structural origin of resonant diffraction in RuO2

We report Ru L3-edge resonant X-ray diffraction studies on single crystal and (001) oriented epitaxial films of RuO2. We investigate the distinct Q = (100) and (001) Bragg-forbidden reflections as a function of incident energy, azimuthal angle, and temperature. The results show that the observed resonant diffraction in RuO2 is fully consistent with a resonant charge anisotropy signal of structural origin permitted by the parent (non-magnetic) rutile P42/mnm space group. These results significantly constrain the magnetic contribution to the resonant diffraction signal and indicate the unlikely existence of k = 0 antiferromagnetic order in RuO2.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Electrochemical Removal of Se(IV) from Wastewater Using RuO2‑Based Catalysts

The removal of selenite (SeO32-) from water is challenging due to the risk of secondary pollutants. To address this, we developed RuO2-based nanocatalysts on the titanium plate (RuO2/TP) for direct electrochemical reduction of Se(IV) to elemental selenium [Se(0)]. Optimizing Sn doping in RuO2 nanoparticles to induce charge redistribution enabled the Ru0.9Sn0.1Ox/TP catalyst to achieve ∼90% Se(IV) removal across concentrations of 0.1, 1, and 10 mM at -2 mA cm-2 over 8 h, outperforming undoped RuO2/TP. Furthermore, Ru0.9Sn0.1Ox/TP also maintained ∼90% removal efficiency in 1 mM of Se(IV) solutions containing competitive anions (0.5 M Cl-, 0.1 M SO42-, 0.01 M NO3-, and their mixtures), demonstrating suitability for complex wastewater treatment. Importantly, the catalysts were recyclable, with no observable contamination introduced into the solution. Density functional theory (DFT) calculations suggest that Sn doping effectively reduces the energy barrier for the reduction of Se(IV) to Se(0).

Hao, Shaoyun↗
NASA NTRS2009

RuO2 Thermometer for Ultra-Low Temperatures

A small, high-resolution, low-power thermometer has been developed for use in ultra-low temperatures that uses multiple RuO2 chip resistors. The use of commercially available thick-film RuO2 chip resistors for measuring cryogenic temperatures is well known due to their low cost, long-term stability, and large resistance change.

Hait, Thomas↗
DOE OSTI2020

Materials Data on NaLi2(RuO2)6 by Materials Project

NaLi2(RuO2)6 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Na1+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are two shorter (2.55 Å) and four longer (2.57 Å) Na–O bond lengths. Li1+ is bonded to six O2- atoms to form distorted LiO6 pentagonal pyramids that share corners with twelve RuO6 octahedra, edges with three RuO6 octahedra, and faces with two equivalent LiO6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 33–68°. There are two shorter (2.17 Å) and four longer (2.18 Å) Li–O bond lengths. There are three inequivalent Ru+3.50+ sites. In the first Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with four RuO6 octahedra, corners with four equivalent LiO6 pentagonal pyramids, edges with four equivalent RuO6 octahedra, and an edgeedge with one LiO6 pentagonal pyramid. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Ru–O bond distances ranging from 2.01–2.08 Å. In the second Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with four RuO6 octahedra, corners with four equivalent LiO6 pentagonal pyramids, edges with four equivalent RuO6 octahedra, and an edgeedge with one LiO6 pentagonal pyramid. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Ru–O bond distances ranging from 2.01–2.08 Å. In the third Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with four RuO6 octahedra, corners with four equivalent LiO6 pentagonal pyramids, edges with four equivalent RuO6 octahedra, and an edgeedge with one LiO6 pentagonal pyramid. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Ru–O bond distances ranging from 2.01–2.08 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Li1+ and three equivalent Ru+3.50+ atoms to form distorted OLi2Ru3 trigonal bipyramids that share corners with four OLi2Ru3 trigonal bipyramids, corners with seven ONaRu3 trigonal pyramids, edges with six OLi2Ru3 trigonal bipyramids, and an edgeedge with one ONaRu3 trigonal pyramid. In the second O2- site, O2- is bonded to two equivalent Li1+ and three equivalent Ru+3.50+ atoms to form distorted OLi2Ru3 trigonal bipyramids that share corners with four OLi2Ru3 trigonal bipyramids, corners with seven ONaRu3 trigonal pyramids, edges with six OLi2Ru3 trigonal bipyramids, and an edgeedge with one ONaRu3 trigonal pyramid. In the third O2- site, O2- is bonded to two equivalent Li1+ and three equivalent Ru+3.50+ atoms to form distorted OLi2Ru3 trigonal bipyramids that share corners with four OLi2Ru3 trigonal bipyramids, corners with seven ONaRu3 trigonal pyramids, edges with six OLi2Ru3 trigonal bipyramids, and an edgeedge with one ONaRu3 trigonal pyramid. In the fourth O2- site, O2- is bonded to one Na1+ and three Ru+3.50+ atoms to form distorted ONaRu3 trigonal pyramids that share corners with seven OLi2Ru3 trigonal bipyramids, corners with seven ONaRu3 trigonal pyramids, an edgeedge with one OLi2Ru3 trigonal bipyramid, and edges with two ONaRu3 trigonal pyramids. In the fifth O2- site, O2- is bonded to one Na1+ and three Ru+3.50+ atoms to form distorted ONaRu3 trigonal pyramids that share corners with seven OLi2Ru3 trigonal bipyramids, corners with seven ONaRu3 trigonal pyramids, an edgeedge with one OLi2Ru3 trigonal bipyramid, and edges with two ONaRu3 trigonal pyramids. In the sixth O2- site, O2- is bonded to one Na1+ and three Ru+3.50+ atoms to form distorted ONaRu3 trigonal pyramids that share corners with seven OLi2Ru3 trigonal bipyramids, corners with seven ONaRu3 trigonal pyramids, an edgeedge with one OLi2Ru3 trigonal bipyramid, and edges with two ONaRu3 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RuO2 by Materials Project

RuO2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Ru4+ is bonded to six equivalent O2- atoms to form corner-sharing RuO6 octahedra. The corner-sharing octahedral tilt angles are 61°. All Ru–O bond lengths are 2.01 Å. O2- is bonded in a trigonal planar geometry to three equivalent Ru4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RuO2 by Materials Project

RuO2 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ru4+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ru–O bond lengths are 2.10 Å. O2- is bonded to four equivalent Ru4+ atoms to form a mixture of edge and corner-sharing ORu4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na(RuO2)4 by Materials Project

Na(RuO2)4 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Na1+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Na–O bond lengths are 2.82 Å. Ru+3.75+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Ru–O bond distances ranging from 1.95–2.07 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three equivalent Ru+3.75+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ru+3.75+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K(RuO2)4 by Materials Project

KRu4O8 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. K1+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All K–O bond lengths are 2.96 Å. Ru+3.75+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Ru–O bond distances ranging from 1.95–2.07 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ru+3.75+ atoms. In the second O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent K1+ and three equivalent Ru+3.75+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(RuO2)2 by Materials Project

LiRu2O4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Li1+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are a spread of Li–O bond distances ranging from 2.14–2.81 Å. There are two inequivalent Ru+3.50+ sites. In the first Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedra tilt angles range from 45–57°. There are a spread of Ru–O bond distances ranging from 1.98–2.09 Å. In the second Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedra tilt angles range from 45–57°. There are a spread of Ru–O bond distances ranging from 1.95–2.08 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Li1+ and three Ru+3.50+ atoms. In the second O2- site, O2- is bonded to two equivalent Li1+ and three equivalent Ru+3.50+ atoms to form a mixture of distorted edge and corner-sharing OLi2Ru3 trigonal bipyramids. In the third O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Li1+ and three Ru+3.50+ atoms. In the fourth O2- site, O2- is bonded to two equivalent Li1+ and three equivalent Ru+3.50+ atoms to form a mixture of distorted edge and corner-sharing OLi2Ru3 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb(RuO2)4 by Materials Project

RbRu4O8 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Rb1+ is bonded in a distorted body-centered cubic geometry to eight equivalent O2- atoms. All Rb–O bond lengths are 3.02 Å. Ru+3.75+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Ru–O bond distances ranging from 1.95–2.07 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Rb1+ and three equivalent Ru+3.75+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ru+3.75+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na(RuO2)2 by Materials Project

NaRu2O4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.37–2.67 Å. There are two inequivalent Ru+3.50+ sites. In the first Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedra tilt angles range from 45–54°. There are a spread of Ru–O bond distances ranging from 2.00–2.07 Å. In the second Ru+3.50+ site, Ru+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RuO6 octahedra. The corner-sharing octahedra tilt angles range from 45–54°. There are a spread of Ru–O bond distances ranging from 2.01–2.07 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Ru+3.50+ atoms. In the second O2- site, O2- is bonded to two equivalent Na1+ and three equivalent Ru+3.50+ atoms to form a mixture of distorted edge and corner-sharing ONa2Ru3 square pyramids. In the third O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Ru+3.50+ atoms. In the fourth O2- site, O2- is bonded to two equivalent Na1+ and three equivalent Ru+3.50+ atoms to form a mixture of distorted edge and corner-sharing ONa2Ru3 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Stern layers on RuO2 (100) and (110) in electrolyte: Surface X-ray scattering studies

Electrochemical Stern layers are observed on the surfaces of RuO 2 single crystals in 0.1 M CsF electrolyte. The Stern layers formed at the interfaces of RuO 2 (110) and (100) are compared to the previously reported Stern layer on Pt (111) [Liu et al., J. Phys. Chem. Lett., 9 (2018) 1265]. While the Cs + density profiles at the potentials close to hydrogen evolution reactions are similar, the hydration layers intervening the surface and the Cs + layer are significantly denser on RuO 2 surfaces than that on Pt(111) surface, reflecting the oxygen termination of RuO 2 surfaces. The overall similarities between Stern layers on ruthenium surfaces and platinum surface suggest the universal presence of Stern layers in all well-defined solid-electrolyte interfaces.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2025

Altermagnetic behavior in OsO2: Parallels with RuO2

This dataset contains input and output files from DFT simulations used to reproduce the electronic and phonon band structures of bulk OsO₂ and RuO₂. The files include data from initial electronic structure and phonon calculations performed with Hubbard-U correction (i.e., Antiferromagnetic, AFM) and without Hubbard-U correction (i.e., Non-magnetic, NM). The electronic structure calculations are provided both with and without spin-orbit coupling (SOC). The computed electronic properties are compared with existing literature, while the calculated phonon density of states (PhDOS) is compared with experimental PhDOS.

36 MATERIALS SCIENCE↗
DOE OSTI2026

Activationof Oxygen Evolution Electrocatalysis viaReduced Ruthenium–Oxygen–Ruthenium Coordination

Noble metal oxides such as RuO2 are the state-of-the-art electrocatalysts for anodic reactions in acidic electrolytes, but their scarcity and moderate activity greatly limit emerging renewable energy technologies. Here, we show that oxidized overlayers of ruthenium on earth-abundant manganese oxide (MnO2/o-RuOx) nanocrystal supports exhibit Ru chemical states associated with reduced Ru–O–Ru coordination that enable dynamic switching of hydrogen bonding, with *OH intermediates hydrogen bonding to surface O and *OOH intermediates bonding to protruding RuOx clusters. The resulting electrocatalysts exhibit an overpotential of 218.9 ± 0.3 mV at 10 mA cm–2 for the oxygen evolution reaction in acid, corresponding to a 2425% increase in Ru mass activity compared to RuO2, enabling the construction of electrolyzers that achieved 3 A cm–2 at 1.646 V, 5.54 A cm–2 at 1.8 V, and exhibited over 3000-h stability at 100 mA cm–2. These findings motivate further efforts to develop nanomaterials that harness reduced Ru–O–Ru coordination to enable emerging renewable energy technologies.

58 GEOSCIENCES↗