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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 217 records · Page 12
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Substrate birefringence as a source of artifacts in spintronic THz emission spectra

Terahertz (THz) emission from spintronic THz emitters (STEs) has been extensively studied, both for its potential application in THz technologies and as a tool for probing spin dynamics, conductivity, and crystal anisotropy via time-domain THz spectroscopy. However, substrate birefringence can modify the emitted THz polarization, distorting the measured spectra and leading to potential misinterpretation of the results. While some aspects of substrate birefringence on THz emission have been studied in the time domain, its effects on THz spectra have not been discussed in detail. In the THz emission spectrum from STEs, we observe distinct spectral signatures that depend on sample orientation. To understand these signatures, we use STEs grown on c-cut sapphire and systematically vary the orientation of a (100) rutile TiO 2 window in both pump-through and THz-through geometries to identify the birefringence-induced effects. These findings demonstrate that substrate birefringence plays a critical role in the emitted THz spectrum and must be carefully considered in the analysis of time-domain THz spectroscopy data. We also show that artifacts from smaller birefringence can have a more misleading effect on the THz spectra.

Shrestha, Shreya [Univ. of Delaware, Newark, DE (U↗
DOE OSTI2020

Materials Data on SiO2 by Materials Project

SiO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Si4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing SiO6 octahedra. The corner-sharing octahedral tilt angles are 49°. There is four shorter (1.78 Å) and two longer (1.84 Å) Si–O bond length. O2- is bonded in a distorted trigonal planar geometry to three equivalent Si4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiO2 by Materials Project

TiO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Ti4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 49°. There is four shorter (1.96 Å) and two longer (2.00 Å) Ti–O bond length. O2- is bonded in a distorted trigonal planar geometry to three equivalent Ti4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgF2 by Materials Project

MgF2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Mg2+ is bonded to six equivalent F1- atoms to form a mixture of corner and edge-sharing MgF6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are two shorter (2.01 Å) and four longer (2.02 Å) Mg–F bond lengths. F1- is bonded in a distorted trigonal planar geometry to three equivalent Mg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnF2 by Materials Project

ZnF2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Zn2+ is bonded to six equivalent F1- atoms to form a mixture of edge and corner-sharing ZnF6 octahedra. The corner-sharing octahedral tilt angles are 50°. All Zn–F bond lengths are 2.07 Å. F1- is bonded in a distorted trigonal planar geometry to three equivalent Zn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on VO2 by Materials Project

VO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. V4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There is two shorter (1.91 Å) and four longer (1.99 Å) V–O bond length. O2- is bonded in a distorted trigonal planar geometry to three equivalent V4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CrO2 by Materials Project

CrO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Cr4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There is two shorter (1.92 Å) and four longer (1.95 Å) Cr–O bond length. O2- is bonded in a distorted trigonal planar geometry to three equivalent Cr4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnO2 by Materials Project

MnO2 is Rutile-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Mn4+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Mn–O bond distances ranging from 1.92–1.95 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mn4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to three equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnO2 by Materials Project

MnO2 is Rutile-like structured and crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Mn4+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Mn–O bond distances ranging from 1.92–1.95 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three equivalent Mn4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PbO2 by Materials Project

PbO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Pb4+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing PbO6 octahedra. The corner-sharing octahedral tilt angles are 51°. All Pb–O bond lengths are 2.21 Å. O2- is bonded in a trigonal planar geometry to three equivalent Pb4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaO2 by Materials Project

TaO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Ta4+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are two shorter (2.02 Å) and four longer (2.09 Å) Ta–O bond lengths. O2- is bonded in a distorted T-shaped geometry to three equivalent Ta4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TeO2 by Materials Project

TeO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Te4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are two shorter (2.18 Å) and four longer (2.23 Å) Te–O bond lengths. O2- is bonded in a distorted trigonal planar geometry to three equivalent Te4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCl2 by Materials Project

CaCl2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent Cl1- atoms to form a mixture of corner and edge-sharing CaCl6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are four shorter (2.76 Å) and two longer (2.77 Å) Ca–Cl bond lengths. Cl1- is bonded in a distorted trigonal planar geometry to three equivalent Ca2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgH2 by Materials Project

MgH2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Mg2+ is bonded to six equivalent H1- atoms to form a mixture of corner and edge-sharing MgH6 octahedra. The corner-sharing octahedral tilt angles are 50°. There is two shorter (1.95 Å) and four longer (1.96 Å) Mg–H bond length. H1- is bonded in a trigonal planar geometry to three equivalent Mg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NbO2 by Materials Project

NbO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Nb4+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 44°. There are two shorter (2.04 Å) and four longer (2.10 Å) Nb–O bond lengths. O2- is bonded in a distorted T-shaped geometry to three equivalent Nb4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GeO2 by Materials Project

GeO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Ge4+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There is four shorter (1.90 Å) and two longer (1.95 Å) Ge–O bond length. O2- is bonded in a distorted trigonal planar geometry to three equivalent Ge4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnO2 by Materials Project

MnO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Mn4+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There is four shorter (1.91 Å) and two longer (1.93 Å) Mn–O bond length. O2- is bonded in a distorted trigonal planar geometry to three equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MoO2 by Materials Project

MoO2 is Rutile structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Mo4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing MoO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are two shorter (2.02 Å) and four longer (2.10 Å) Mo–O bond lengths. O2- is bonded in a distorted trigonal planar geometry to three equivalent Mo4+ atoms.

36 MATERIALS SCIENCE↗