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At least 253 records · Page 14
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Er(SiOs)2 by Materials Project

ErOs2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er3+ is bonded in a 8-coordinate geometry to eight equivalent Os+1.50- atoms. All Er–Os bond lengths are 3.18 Å. Os+1.50- is bonded in a 4-coordinate geometry to four equivalent Er3+ and four equivalent Si atoms. All Os–Si bond lengths are 2.40 Å. Si is bonded in a 5-coordinate geometry to four equivalent Os+1.50- and one Si atom. The Si–Si bond length is 2.45 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(CuSi)2 by Materials Project

ErCu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Er–Si bond lengths are 3.02 Å. Cu+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing CuSi4 tetrahedra. All Cu–Si bond lengths are 2.38 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Er3+, four equivalent Cu+2.50+, and one Si4- atom. The Si–Si bond length is 2.33 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(MnSi)2 by Materials Project

ErMn2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Er–Si bond lengths are 3.00 Å. Mn+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing MnSi4 tetrahedra. All Mn–Si bond lengths are 2.36 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Er3+, four equivalent Mn+2.50+, and one Si4- atom. The Si–Si bond length is 2.45 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(SiNi)2 by Materials Project

ErNi2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Er–Si bond lengths are 3.03 Å. Ni+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing NiSi4 tetrahedra. All Ni–Si bond lengths are 2.30 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Er3+, four equivalent Ni+2.50+, and one Si4- atom. The Si–Si bond length is 2.39 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(SiRu)2 by Materials Project

ErRu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er3+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Er–Si bond lengths are 3.21 Å. Ru+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing RuSi4 tetrahedra. All Ru–Si bond lengths are 2.38 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Er3+ and four equivalent Ru+2.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(FeSi)2 by Materials Project

ErFe2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Er–Si bond lengths are 3.06 Å. Fe+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing FeSi4 tetrahedra. All Fe–Si bond lengths are 2.26 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Er3+, four equivalent Fe+2.50+, and one Si4- atom. The Si–Si bond length is 2.52 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(CuTe)3 by Materials Project

ErCu3Te3 crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. Er3+ is bonded to six Te2- atoms to form ErTe6 octahedra that share corners with four equivalent ErTe6 octahedra, corners with ten CuTe4 tetrahedra, an edgeedge with one ErTe6 octahedra, edges with four CuTe4 tetrahedra, and faces with two CuTe4 tetrahedra. The corner-sharing octahedra tilt angles range from 46–48°. There are a spread of Er–Te bond distances ranging from 3.01–3.10 Å. There are four inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with three equivalent ErTe6 octahedra, corners with ten CuTe4 tetrahedra, an edgeedge with one ErTe6 octahedra, an edgeedge with one CuTe4 tetrahedra, and a faceface with one ErTe6 octahedra. The corner-sharing octahedra tilt angles range from 54–63°. There are a spread of Cu–Te bond distances ranging from 2.59–2.74 Å. In the second Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent ErTe6 octahedra, corners with ten CuTe4 tetrahedra, edges with two equivalent ErTe6 octahedra, and an edgeedge with one CuTe4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–64°. There are a spread of Cu–Te bond distances ranging from 2.62–2.65 Å. In the third Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with three equivalent ErTe6 octahedra, corners with ten CuTe4 tetrahedra, an edgeedge with one ErTe6 octahedra, an edgeedge with one CuTe4 tetrahedra, and a faceface with one ErTe6 octahedra. The corner-sharing octahedra tilt angles range from 51–67°. There are a spread of Cu–Te bond distances ranging from 2.58–2.77 Å. In the fourth Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent ErTe6 octahedra, corners with ten CuTe4 tetrahedra, edges with two equivalent ErTe6 octahedra, and an edgeedge with one CuTe4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–61°. There are a spread of Cu–Te bond distances ranging from 2.63–2.70 Å. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a distorted hexagonal planar geometry to two equivalent Er3+ and four Cu1+ atoms. In the second Te2- site, Te2- is bonded in a distorted hexagonal planar geometry to two equivalent Er3+ and four Cu1+ atoms. In the third Te2- site, Te2- is bonded in a 6-coordinate geometry to two equivalent Er3+ and four Cu1+ atoms. In the fourth Te2- site, Te2- is bonded in a 6-coordinate geometry to two equivalent Er3+ and four Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(CuS)3 by Materials Project

ErCu3S3 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Er3+ is bonded to six equivalent S2- atoms to form ErS6 octahedra that share corners with twelve equivalent CuS4 tetrahedra, edges with three equivalent ErS6 octahedra, and edges with six equivalent CuS4 tetrahedra. All Er–S bond lengths are 2.72 Å. Cu1+ is bonded to four equivalent S2- atoms to form CuS4 tetrahedra that share corners with four equivalent ErS6 octahedra, corners with six equivalent CuS4 tetrahedra, edges with two equivalent ErS6 octahedra, and edges with three equivalent CuS4 tetrahedra. The corner-sharing octahedra tilt angles range from 16–55°. There are a spread of Cu–S bond distances ranging from 2.33–2.41 Å. S2- is bonded in a 6-coordinate geometry to two equivalent Er3+ and four equivalent Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(Mo3S4)2 by Materials Project

ErMo6S8 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Er3+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are two shorter (2.69 Å) and six longer (2.99 Å) Er–S bond lengths. Mo+2.17+ is bonded to five S2- atoms to form a mixture of corner and edge-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.42–2.58 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 1-coordinate geometry to one Er3+ and three equivalent Mo+2.17+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to one Er3+ and four equivalent Mo+2.17+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(Co2B)6 by Materials Project

ErCo12B6 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Er3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Er–B bond lengths are 3.02 Å. There are two inequivalent Co+1.25+ sites. In the first Co+1.25+ site, Co+1.25+ is bonded in a T-shaped geometry to three equivalent B3- atoms. All Co–B bond lengths are 2.11 Å. In the second Co+1.25+ site, Co+1.25+ is bonded to four equivalent B3- atoms to form a mixture of distorted edge and corner-sharing CoB4 trigonal pyramids. There are two shorter (2.02 Å) and two longer (2.04 Å) Co–B bond lengths. B3- is bonded in a 7-coordinate geometry to one Er3+ and seven Co+1.25+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(CuTe)3 by Materials Project

ErCu3Te3 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Er3+ is bonded to six equivalent Te2- atoms to form ErTe6 octahedra that share corners with twelve equivalent CuTe4 tetrahedra, edges with three equivalent ErTe6 octahedra, and edges with six equivalent CuTe4 tetrahedra. All Er–Te bond lengths are 3.06 Å. Cu1+ is bonded to four equivalent Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent ErTe6 octahedra, corners with six equivalent CuTe4 tetrahedra, edges with two equivalent ErTe6 octahedra, and edges with three equivalent CuTe4 tetrahedra. The corner-sharing octahedra tilt angles range from 15–59°. There are a spread of Cu–Te bond distances ranging from 2.61–2.68 Å. Te2- is bonded in a 6-coordinate geometry to two equivalent Er3+ and four equivalent Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(Mo3Se4)2 by Materials Project

ErMo6Se8 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Er3+ is bonded in a body-centered cubic geometry to eight Se2- atoms. There are two shorter (2.80 Å) and six longer (3.10 Å) Er–Se bond lengths. Mo+2.17+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.75 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 1-coordinate geometry to one Er3+ and three equivalent Mo+2.17+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to one Er3+ and four equivalent Mo+2.17+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1996

Sea Ice Floe Size Distribution in the Beaufort Sea Measured by ERS-1 SAR (abstract)

Model results indicate that understanding summer heat balance and freshwater balance in the polar oceans requires knowledge of how much goes into vertical and lateral sea ice melt. In addition to thickness, two of the key ice parameters that affect melt rate are ice concentration and floe size. Smaller ice floes and more open water enables more heat to go into lateral melt preferentially to vertical melt, thereby enhancing warming up the upper ocean and increasing stratification. Using ERS-1 SAR imagery along two areas, one in the Beaufort Sea and another in the Chukchi Sea, floe size distributions were obtained during the summer period in 1992. Comparisons will be made of floe distributions, together with meteorological and buoy measurements, to examine the differences between an ice sink region (Chukchi) and a multiyear ice region (Beaufort) in the summer melt process.

ERS-1 SAR Beaufort Sea Chukchi Sea heat balance ic↗
NASA NTRS1995

OGCM Simulations of Equatorial Pacific Current and Temperature to ERS-1, FSU and NMC Surface Winds and to Assimilation of Subsurface Temperature Data

The relative accuracies of three surface wind data products for the tropical Pacific Ocean during April 1992 to March 1994 were examined by analyzing temperature and current fields along the equator, which were simulated with an ocean general circulation model. Simulations were made with and without assimilation of surface and subsurface temperature data. Simulated currents were compared with observations at three sites (170oW, 140oW, 110oW) at the equator. Model-generated currents and temperatures indicated that the ERS-1 westward wind speeds were low compared to the FSU and NMC winds. With data assimilation, the agreement between simulated and observed currents was highest at 170oW and lowest at 110oW.

ERS-1 FSU↗
NASA NTRS1994

Progress in Polar Oceans Research Using ERS-1 Data

Data from ERS-1, especially from the AMI Image Mode, or SAR, have been particularly useful in providing data on ice type and motion and oceanic mesoscale features. These data have been used in studies of ocean and ice circulation, climate processes, convection, and have also proved useful in support of operations in ice covered seas.

polar oceans ice motion↗
NASA NTRS1998

ECMWF and ERS-1 Surface Winds Over the Arabian Sea During July 1995

The European Center for Medium-Range Weather Forecasts (ECMWF) and Institut Francais Pour la Recherche et 1'Exploitation de la Mer (IFREMER) European Remote-Sensing Satellite (ERS-1), named IFR2, surface wind velocity data products are compared during July 1995 over the Arabian Sea.

Remote-Sensing Satellite ERS-1 Arabian Sea surface↗