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At least 181 records · Page 10
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Yb(SiNi)2 by Materials Project

YbNi2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Yb–Si bond lengths are 3.07 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 Yb3+, four equivalent Ni+2.50+, and one Si4- atom. The Si–Si bond length is 2.45 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(CuSi)2 by Materials Project

YbCu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb3+ is bonded to eight equivalent Si4- atoms to form YbSi8 hexagonal bipyramids that share corners with sixteen equivalent CuSi4 tetrahedra, edges with four equivalent YbSi8 hexagonal bipyramids, edges with eight equivalent CuSi4 tetrahedra, and faces with four equivalent YbSi8 hexagonal bipyramids. All Yb–Si bond lengths are 3.08 Å. Cu+2.50+ is bonded to four equivalent Si4- atoms to form CuSi4 tetrahedra that share corners with eight equivalent YbSi8 hexagonal bipyramids, corners with four equivalent CuSi4 tetrahedra, edges with four equivalent YbSi8 hexagonal bipyramids, and edges with four equivalent CuSi4 tetrahedra. All Cu–Si bond lengths are 2.39 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Yb3+, four equivalent Cu+2.50+, and one Si4- atom. The Si–Si bond length is 2.34 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(SbTe2)2 by Materials Project

YbSb2Te4 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Yb2+ is bonded in a 8-coordinate geometry to eight equivalent Te2- atoms. There are four shorter (3.15 Å) and four longer (3.57 Å) Yb–Te bond lengths. Sb3+ is bonded to six equivalent Te2- atoms to form edge-sharing SbTe6 octahedra. There are a spread of Sb–Te bond distances ranging from 2.99–3.34 Å. Te2- is bonded in a 1-coordinate geometry to two equivalent Yb2+ and three equivalent Sb3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(Ga3Te5)2 by Materials Project

YbGa6Te10 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. Yb2+ is bonded to six Te2- atoms to form distorted YbTe6 octahedra that share corners with two equivalent YbTe6 octahedra, corners with four GaTe4 tetrahedra, and edges with four GaTe4 tetrahedra. The corner-sharing octahedra tilt angles range from 22–24°. There are a spread of Yb–Te bond distances ranging from 3.22–3.34 Å. There are six inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share corners with six GaTe4 tetrahedra and an edgeedge with one YbTe6 octahedra. There are a spread of Ga–Te bond distances ranging from 2.65–2.73 Å. In the second Ga3+ site, Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share a cornercorner with one YbTe6 octahedra and corners with six GaTe4 tetrahedra. The corner-sharing octahedral tilt angles are 69°. There are a spread of Ga–Te bond distances ranging from 2.61–2.73 Å. In the third Ga3+ site, Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share a cornercorner with one YbTe6 octahedra, corners with four GaTe4 tetrahedra, an edgeedge with one YbTe6 octahedra, and an edgeedge with one GaTe4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. There are a spread of Ga–Te bond distances ranging from 2.64–2.69 Å. In the fourth Ga3+ site, Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share corners with four GaTe4 tetrahedra, an edgeedge with one YbTe6 octahedra, and an edgeedge with one GaTe4 tetrahedra. There are a spread of Ga–Te bond distances ranging from 2.63–2.72 Å. In the fifth Ga3+ site, Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share a cornercorner with one YbTe6 octahedra, corners with four GaTe4 tetrahedra, and an edgeedge with one GaTe4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. There are a spread of Ga–Te bond distances ranging from 2.60–2.73 Å. In the sixth Ga3+ site, Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share a cornercorner with one YbTe6 octahedra, corners with six GaTe4 tetrahedra, and an edgeedge with one YbTe6 octahedra. The corner-sharing octahedral tilt angles are 69°. There are a spread of Ga–Te bond distances ranging from 2.65–2.71 Å. There are eleven inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a distorted trigonal non-coplanar geometry to three Ga3+ atoms. In the second Te2- site, Te2- is bonded in an L-shaped geometry to two Ga3+ atoms. In the third Te2- site, Te2- is bonded in a 3-coordinate geometry to one Yb2+ and two Ga3+ atoms. In the fourth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga3+ atoms. In the fifth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga3+ atoms. In the sixth Te2- site, Te2- is bonded in a 3-coordinate geometry to one Yb2+ and two Ga3+ atoms. In the seventh Te2- site, Te2- is bonded in a 4-coordinate geometry to two equivalent Yb2+ and two equivalent Ga3+ atoms. In the eighth Te2- site, Te2- is bonded in a 4-coordinate geometry to two equivalent Yb2+ and two equivalent Ga3+ atoms. In the ninth Te2- site, Te2- is bonded in a 3-coordinate geometry to three Ga3+ atoms. In the tenth Te2- site, Te2- is bonded in a distorted trigonal non-coplanar geometry to one Yb2+ and two Ga3+ atoms. In the eleventh Te2- site, Te2- is bonded in a 3-coordinate geometry to one Yb2+ and two Ga3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(BiTe2)2 by Materials Project

YbBi2Te4 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Yb2+ is bonded in a 8-coordinate geometry to eight equivalent Te2- atoms. There are four shorter (3.15 Å) and four longer (3.65 Å) Yb–Te bond lengths. Bi3+ is bonded to six equivalent Te2- atoms to form edge-sharing BiTe6 octahedra. There are a spread of Bi–Te bond distances ranging from 3.12–3.29 Å. Te2- is bonded in a 1-coordinate geometry to two equivalent Yb2+ and three equivalent Bi3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(CdSb)2 by Materials Project

YbCd2Sb2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Yb2+ is bonded to six equivalent Sb3- atoms to form YbSb6 octahedra that share corners with twelve equivalent CdSb4 tetrahedra, edges with six equivalent YbSb6 octahedra, and edges with six equivalent CdSb4 tetrahedra. All Yb–Sb bond lengths are 3.25 Å. Cd2+ is bonded to four equivalent Sb3- atoms to form CdSb4 tetrahedra that share corners with six equivalent YbSb6 octahedra, corners with six equivalent CdSb4 tetrahedra, edges with three equivalent YbSb6 octahedra, and edges with three equivalent CdSb4 tetrahedra. The corner-sharing octahedra tilt angles range from 13–57°. There are three shorter (2.91 Å) and one longer (3.03 Å) Cd–Sb bond lengths. Sb3- is bonded to three equivalent Yb2+ and four equivalent Cd2+ atoms to form a mixture of distorted corner and edge-sharing SbYb3Cd4 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(MnAs)2 by Materials Project

YbMn2As2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Yb2+ is bonded to six equivalent As3- atoms to form YbAs6 octahedra that share corners with twelve equivalent MnAs4 tetrahedra, edges with six equivalent YbAs6 octahedra, and edges with six equivalent MnAs4 tetrahedra. All Yb–As bond lengths are 2.96 Å. Mn2+ is bonded to four equivalent As3- atoms to form MnAs4 tetrahedra that share corners with six equivalent YbAs6 octahedra, corners with six equivalent MnAs4 tetrahedra, edges with three equivalent YbAs6 octahedra, and edges with three equivalent MnAs4 tetrahedra. The corner-sharing octahedra tilt angles range from 20–51°. There are one shorter (2.41 Å) and three longer (2.44 Å) Mn–As bond lengths. As3- is bonded to three equivalent Yb2+ and four equivalent Mn2+ atoms to form a mixture of distorted edge and corner-sharing AsYb3Mn4 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(ZnSb)2 by Materials Project

YbZn2Sb2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Yb2+ is bonded to six equivalent Sb3- atoms to form YbSb6 octahedra that share corners with twelve equivalent ZnSb4 tetrahedra, edges with six equivalent YbSb6 octahedra, and edges with six equivalent ZnSb4 tetrahedra. All Yb–Sb bond lengths are 3.21 Å. Zn2+ is bonded to four equivalent Sb3- atoms to form ZnSb4 tetrahedra that share corners with six equivalent YbSb6 octahedra, corners with six equivalent ZnSb4 tetrahedra, edges with three equivalent YbSb6 octahedra, and edges with three equivalent ZnSb4 tetrahedra. The corner-sharing octahedra tilt angles range from 18–54°. There are three shorter (2.72 Å) and one longer (2.82 Å) Zn–Sb bond lengths. Sb3- is bonded to three equivalent Yb2+ and four equivalent Zn2+ atoms to form a mixture of distorted edge and corner-sharing SbYb3Zn4 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(PPd)2 by Materials Project

YbPd2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb2+ is bonded to eight equivalent P3- atoms to form YbP8 hexagonal bipyramids that share corners with sixteen equivalent PdP4 tetrahedra, edges with four equivalent YbP8 hexagonal bipyramids, edges with eight equivalent PdP4 tetrahedra, and faces with four equivalent YbP8 hexagonal bipyramids. All Yb–P bond lengths are 3.12 Å. Pd2+ is bonded to four equivalent P3- atoms to form PdP4 tetrahedra that share corners with eight equivalent YbP8 hexagonal bipyramids, corners with four equivalent PdP4 tetrahedra, edges with four equivalent YbP8 hexagonal bipyramids, and edges with four equivalent PdP4 tetrahedra. All Pd–P bond lengths are 2.47 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Yb2+, four equivalent Pd2+, and one P3- atom. The P–P bond length is 2.16 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(FeSb3)4 by Materials Project

YbFe4Sb12 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Yb3+ is bonded to twelve equivalent Sb+1.25- atoms to form YbSb12 cuboctahedra that share faces with eight equivalent FeSb6 octahedra. All Yb–Sb bond lengths are 3.41 Å. Fe3+ is bonded to six equivalent Sb+1.25- atoms to form FeSb6 octahedra that share corners with six equivalent FeSb6 octahedra and faces with two equivalent YbSb12 cuboctahedra. The corner-sharing octahedral tilt angles are 52°. All Fe–Sb bond lengths are 2.55 Å. Sb+1.25- is bonded in a 2-coordinate geometry to one Yb3+, two equivalent Fe3+, and two equivalent Sb+1.25- atoms. There are one shorter (2.98 Å) and one longer (3.05 Å) Sb–Sb bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(AlC)3 by Materials Project

YbAl3C3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Yb3+ is bonded to six equivalent C4- atoms to form YbC6 octahedra that share corners with six equivalent AlC4 tetrahedra, edges with six equivalent YbC6 octahedra, and edges with six equivalent AlC4 tetrahedra. All Yb–C bond lengths are 2.63 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded in a trigonal planar geometry to three equivalent C4- atoms. All Al–C bond lengths are 1.98 Å. In the second Al3+ site, Al3+ is bonded to four C4- atoms to form AlC4 tetrahedra that share corners with three equivalent YbC6 octahedra, corners with seven equivalent AlC4 tetrahedra, and edges with three equivalent YbC6 octahedra. The corner-sharing octahedral tilt angles are 24°. There are one shorter (2.03 Å) and three longer (2.07 Å) Al–C bond lengths. There are two inequivalent C4- sites. In the first C4- site, C4- is bonded in a 3-coordinate geometry to three equivalent Yb3+ and three equivalent Al3+ atoms. In the second C4- site, C4- is bonded to five Al3+ atoms to form corner-sharing CAl5 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(AlC)3 by Materials Project

YbAl3C3 crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Yb3+ is bonded to six C4- atoms to form YbC6 octahedra that share corners with six AlC4 tetrahedra, edges with six equivalent YbC6 octahedra, and edges with six AlC4 tetrahedra. There are three shorter (2.61 Å) and three longer (2.65 Å) Yb–C bond lengths. There are three inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four C4- atoms to form AlC4 tetrahedra that share corners with three equivalent YbC6 octahedra, corners with seven AlC4 tetrahedra, and edges with three equivalent YbC6 octahedra. The corner-sharing octahedral tilt angles are 26°. There are one shorter (2.05 Å) and three longer (2.06 Å) Al–C bond lengths. In the second Al3+ site, Al3+ is bonded to four C4- atoms to form AlC4 tetrahedra that share corners with three equivalent YbC6 octahedra, corners with seven AlC4 tetrahedra, and edges with three equivalent YbC6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are one shorter (2.03 Å) and three longer (2.08 Å) Al–C bond lengths. In the third Al3+ site, Al3+ is bonded in a distorted trigonal planar geometry to four C4- atoms. There are three shorter (1.98 Å) and one longer (2.54 Å) Al–C bond lengths. There are three inequivalent C4- sites. In the first C4- site, C4- is bonded to five Al3+ atoms to form corner-sharing CAl5 trigonal bipyramids. In the second C4- site, C4- is bonded in a 3-coordinate geometry to three equivalent Yb3+ and four Al3+ atoms. In the third C4- site, C4- is bonded in a 6-coordinate geometry to three equivalent Yb3+ and three equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(Ni2As)2 by Materials Project

YbNi4As2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Yb2+ is bonded to six equivalent As3- atoms to form a mixture of corner and edge-sharing YbAs6 octahedra. The corner-sharing octahedral tilt angles are 40°. There are two shorter (2.88 Å) and four longer (2.90 Å) Yb–As bond lengths. Ni1+ is bonded in a trigonal non-coplanar geometry to three equivalent As3- atoms. There are two shorter (2.38 Å) and one longer (2.40 Å) Ni–As bond lengths. As3- is bonded in a 9-coordinate geometry to three equivalent Yb2+ and six equivalent Ni1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

The impact of 2 H 9/2 → 4 I 13/2 emission from Er 3+ ions on ratiometric optical temperature sensing with Yb 3+ /Er 3+ co-doped upconversion materials

Yb 3+ /Er 3+ co-doped upconversion materials are widely used for luminescence intensity ratio (LIR) thermometry, where the relative intensity ratio of the green luminescence transitions ( 2 H 11/2 4 I 15/2 and 4 S 3/2 4 I 15/2 ) of Er 3+ dopant ions changes with temperature. In this work we report on the impact of an additional transition from the 2 H 9/2 level to the intermediate 4 I 13/2 level, which overlaps with the green luminescence normally used for LIR thermometry. The 2 H 9/2 4 I 13/2 emission overlaps extensively with the 4 S 3/2 4 I 15/2 emission and is more sensitive to pump power. The wavelength intervals used to integrate both 2 H 11/2 4 I 15/2 and 4 S 3/2 4 I 15/2 luminescence need be selected carefully in order to achieve accurate temperature readouts.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Yb:Lu 2 O 3 hydrothermally grown single-crystal high-resolution absorption spectra obtained between 8 and 300 K

Here we present new high-resolution absorption data for the important sesquioxide laser material Yb:Lu 2 O 3 for the spectral range of 880–1020 nm, at various temperatures between 8 and 300 K, and for the zero-phonon region from 960 to 990 nm, at temperatures from 8 to 300 K. We have experimentally observed the C 3i (0,1)–(1,3) transition for the first time, located at 880.7 nm at 8 K. Based on high confidence fitting functions to the experimental data, we provide the first complete compilation of all observed electronic and electronic–vibrational transitions. Detailed fitting and plots of the C 2 and C 3i zero-line data show an evolution of the linewidth from being predominantly electronic below about 100 K to being dominated by thermal processes above 100 K. We have also found evidence for a “soft” phase transition between 80 and 100 K that changes the local coordination environment.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2021

Influence of TiO 2 on the densification behaviour of Yb 2 O 3

The effect of temperature and heating rate on the densification of ytterbia (Yb 2 O 3 ), with and without titania (TiO 2 ) doping was investigated. It is shown that up to a certain doping level, titania doping enhances the densification behaviour of ytterbia. The effect of titania doping on crystal structure confirms that titania is substitutionally incorporated in ytterbia up to the solubility limit, which corresponds well with the densification results. The increased densification rate of titania-doped ytterbia is attributed to the formation of cation vacancy and lattice distortion. Using constant heating rate experiments, the activation energy for densification has been calculated and it is shown that in the intermediate density range (60% to 85%), the activation energy is independent of the density. Furthermore, titania doping increases the activation energy for densification.

20 FOSSIL-FUELED POWER PLANTS↗
DOE OSTI2024

Physical origins of the varying performance and unusual transport behaviors among thermoelectric A Mg 2 Sb 2 materials ( A = Ca, Sr, Sm, Yb, and Mg)

Contrary to the similar thermoelectric performance among both AZn 2 Sb 2 and AMg 2 Bi 2 compounds, their isostructural counterparts, AMg 2 Sb 2 , can exhibit thermoelectric figure of merit values that vary by orders of magnitude with different A elements. Here, we reveal physical origins accounting for the significantly differing performance among AMg 2 Sb 2 -based compounds (A = Ca, Sr, Sm, Yb, and Mg) through comprehensive analyses, where it is shown that the dispar- ities in performance at the macroscale essentially originate from the widely varying activation energies that equal amounts of dopant can induce. Meanwhile, a few unusual transport behaviors regarding electrical conductivity, carrier concentration, or lattice thermal con- ductivity among these compounds have been identified, and we also present their rationales in depth. Furthermore, this mechanism-focused study can not only promote further understanding of the complex transport behaviors in condensed matter but be instrumental in rationally tun- ing the physical properties of materials as well.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Evolution of Highly Anisotropic Magnetism in the Titanium-Based Kagome Metals LnTi 3 Bi 4 (Ln: La···Gd 3+ , Eu 2+ , Yb 2+ )

Here, we present a family of titanium-based kagome metals of the form LnTi 3 Bi 4 (Ln: La···Gd 3+ , Eu 2+ , Yb 2+ ). Four previously unreported compounds are presented: YbTi 3 Bi 4 , GdTi 3 Bi 4 , NdTi 3 Bi 4 , and PrTi 3 Bi 4 . Single-crystal growth methods are provided alongside detailed magnetic and thermodynamic measurements across the entire series. The LnTi 3 Bi 4 family of compounds are orthorhombic (Fmmm), layered compounds that exhibit slightly distorted titanium-based kagome nets interwoven with zigzag lanthanide-based (Ln) chains. Crystals are easily exfoliated parallel to the kagome sheets, and angular resolved photoemission (ARPES) measurements highlight the intricacy of the electronic structure in these compounds. Density functional theory (DFT) and ARPES studies find Dirac points near the Fermi level, consistent with the kagome-derived band structure. The magnetic properties and the associated anisotropy emerge from the quasi-1D zigzag chains of Ln and impart a wide array of magnetic ground states ranging from anisotropic ferromagnetism to complex antiferromagnetism with a cascade of metamagnetic transitions. In conclusion, the combination of the kagome-based electronic structure and highly anisotropic Ln-based magnetism on an exfoliatable platform cements the LnTi 3 Bi 4 family as an interesting addition to the ever-expanding suite of kagome metals.

36 MATERIALS SCIENCE↗