Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “SN”

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.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,747 records · Page 97
All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Composition dependence of atomic order in strain-relaxed, metastable GeSn alloys

Extended x-ray absorption fine structure (EXAFS) measurements of single-crystal Ge/GeSn radial heterostructure nanowires are used to examine the effects of composition on both short-range order (SRO) and longer-range disorder in GeSn alloys. GeSn has prompted significant interest because it can achieve a direct band gap for sufficient Sn concentrations beyond the equilibrium solid solubility limit in an all-group IV system. Short-range order in this material is particularly interesting as it has been predicted to affect the band gap independent of average composition or strain effects. By independently controlling the Sn composition and GeSn thickness during chemical vapor deposition of misfitting GeSn shells around ultrathin, elastically compliant, Ge core nanowires, the elastic misfit strain in the GeSn is minimized for Sn compositions over the studied range ≈Ge 0.96 Sn 0.04 to Ge 0.88 Sn 0.12 . The degree of SRO was found to decrease with increasing Sn composition. Additionally, damping of the EXAFS signal was observed as the Sn content increased, particularly for increasingly distant atomic shells about the absorbing atom, even for scattering paths not involving Sn atoms. This result is quantified as an increase in the mean-squared relative displacement parameters of the shells. These measurements reveal the accommodation of local strain due to the presence of the highly size-mismatched Sn atoms in the Ge diamond cubic lattice (≈14%), which may have effects on the band structure of the material in addition to the influence of short-range atomic order. Comparison among the nanowire samples allows for calculation of the topological rigidity parameter, a ∗∗ , for the first-neighbor bond lengths. Furthermore, these exhibit chemically distinct values for Ge-Ge, Ge-Sn, and Sn-Sn, and they are consistent with the value a ∗∗ = 0.75 ± 0.07 confirming the general applicability of the model to alloys with both large amounts of natural misfit strain and the potential for short-range order.

Crystal structure Semiconductors Transmission elec↗
NASA NTRS2012

A New Method to Constrain Supernova Fractions Using X-ray Observations of Clusters of Galaxies

Supernova (SN) explosions enrich the intracluster medium (ICM) both by creating and dispersing metals. We introduce a method to measure the number of SNe and relative contribution of Type Ia supernovae (SNe Ia) and core-collapse supernovae (SNe cc) by directly fitting X-ray spectral observations. The method has been implemented as an XSPEC model called snapec. snapec utilizes a single-temperature thermal plasma code (apec) to model the spectral emission based on metal abundances calculated using the latest SN yields from SN Ia and SN cc explosion models. This approach provides a self-consistent single set of uncertainties on the total number of SN explosions and relative fraction of SN types in the ICM over the cluster lifetime by directly allowing these parameters to be determined by SN yields provided by simulations. We apply our approach to XMM-Newton European Photon Imaging Camera (EPIC), Reflection Grating Spectrometer (RGS), and 200 ks simulated Astro-H observations of a cooling flow cluster, A3112.We find that various sets of SN yields present in the literature produce an acceptable fit to the EPIC and RGS spectra of A3112. We infer that 30.3% plus or minus 5.4% to 37.1% plus or minus 7.1% of the total SN explosions are SNe Ia, and the total number of SN explosions required to create the observed metals is in the range of (1.06 plus or minus 0.34) x 10(exp 9), to (1.28 plus or minus 0.43) x 10(exp 9), fromsnapec fits to RGS spectra. These values may be compared to the enrichment expected based on well-established empirically measured SN rates per star formed. The proportions of SNe Ia and SNe cc inferred to have enriched the ICM in the inner 52 kiloparsecs of A3112 is consistent with these specific rates, if one applies a correction for the metals locked up in stars. At the same time, the inferred level of SN enrichment corresponds to a star-to-gas mass ratio that is several times greater than the 10% estimated globally for clusters in the A3112 mass range.

Observations↗
NASA NTRS2014

Type-Ia Supernova Rates to Redshift 2.4 from Clash: The Cluster Lensing and Supernova Survey with Hubble

We present the supernova (SN) sample and Type-Ia SN (SN Ia) rates from the Cluster Lensing And Supernova survey with Hubble (CLASH). Using the Advanced Camera for Surveys and the Wide Field Camera 3 on the Hubble Space Telescope (HST), we have imaged 25 galaxy-cluster fields and parallel fields of non-cluster galaxies. We report a sample of 27 SNe discovered in the parallel fields. Of these SNe, approximately 13 are classified as SN Ia candidates, including four SN Ia candidates at redshifts z greater than 1.2.We measure volumetric SN Ia rates to redshift 1.8 and add the first upper limit on the SN Ia rate in the range z greater than 1.8 and less than 2.4. The results are consistent with the rates measured by the HST/ GOODS and Subaru Deep Field SN surveys.We model these results together with previous measurements at z less than 1 from the literature. The best-fitting SN Ia delay-time distribution (DTD; the distribution of times that elapse between a short burst of star formation and subsequent SN Ia explosions) is a power law with an index of 1.00 (+0.06(0.09))/(-0.06(0.10)) (statistical) (+0.12/−0.08) (systematic), where the statistical uncertainty is a result of the 68% and 95% (in parentheses) statistical uncertainties reported for the various SN Ia rates (from this work and from the literature), and the systematic uncertainty reflects the range of possible cosmic star-formation histories. We also test DTD models produced by an assortment of published binary population synthesis (BPS) simulations. The shapes of all BPS double-degenerate DTDs are consistent with the volumetric SN Ia measurements, when the DTD models are scaled up by factors of 3-9. In contrast, all BPS single-degenerate DTDs are ruled out by the measurements at greater than 99% significance level.

SUPERNOVA↗
NASA NTRS2014

Three Gravitationally Lensed Supernovae Behind Clash Galaxy Clusters

We report observations of three gravitationally lensed supernovae (SNe) in the Cluster Lensing And Supernova survey with Hubble (CLASH) Multi-Cycle Treasury program. These objects, SN CLO12Car (z = 1.28), SN CLN12Did (z = 0.85), and SN CLA11Tib (z = 1.14), are located behind three different clusters, MACSJ1720.2+3536 (z = 0.391), RXJ1532.9+3021 (z = 0.345), and A383 (z = 0.187), respectively. Each SN was detected in Hubble Space Telescope optical and infrared images. Based on photometric classification, we find that SNe CLO12Car and CLN12Did are likely to be Type Ia supernovae (SNe Ia), while the classification of SN CLA11Tib is inconclusive. Using multi-color light-curve fits to determine a standardized SN Ia luminosity distance, we infer that SN CLO12Car was approx. 1.0 +/- 0.2 mag brighter than field SNe Ia at a similar redshift and ascribe this to gravitational lens magnification. Similarly, SN CLN12Did is approx. 0.2 +/- 0.2 mag brighter than field SNe Ia. We derive independent estimates of the predicted magnification from CLASH strong+weak-lensing maps of the clusters (in magnitude units, 2.5 log10 μ): 0.83 +/- 0.16 mag for SN CLO12Car, 0.28 +/- 0.08 mag for SN CLN12Did, and 0.43 +/- 0.11 mag for SN CLA11Tib. The two SNe Ia provide a new test of the cluster lens model predictions: we find that the magnifications based on the SN Ia brightness and those predicted by the lens maps are consistent. Our results herald the promise of future observations of samples of cluster-lensed SNe Ia (from the ground or space) to help illuminate the dark-matter distribution in clusters of galaxies, through the direct determination of absolute magnifications.

Three↗
NASA NTRS2017

iPTF17cw: An Engine-Driven Supernova Candidate Discovered Independent of a Gamma-Ray Trigger

We present the discovery, classification, and radio-to-X-ray follow-up observations of iPTF17cw, a broad-lined (BL) type Ic supernova (SN) discovered by the intermediate Palomar Transient Factory (iPTF). Although it is unrelated to the gravitational wave trigger, this SN was discovered as a happy by-product of the extensive observational campaign dedicated to the follow-up of Advanced LIGO event GW 170104. The spectroscopic properties and inferred peak bolometric luminosity of iPTF17cw are most similar to the gamma-ray-burst (GRB)- associated SN, SN 1998bw, while the shape of the r-band light curve is most similar to that of the relativistic SN, SN 2009bb. Karl G. Jansky Very Large Array (VLA) observations of the iPTF17cw field reveal a radio counterpart approximately 10 times less luminous than SN 1998bw, and with a peak radio luminosity comparable to that of SN 2006aj/GRB 060218 and SN 2010bh/GRB 100316D. Our radio observations of iPTF17cw imply a relativistically expanding outflow. However, further late-time observations with the VLA in its most extended configuration are needed to confirm fading of the iPTF17cw radio counterpart at all frequencies. X-ray observations carried out with Chandra reveal the presence of an X-ray counterpart with a luminosity similar to that of SN 2010bh/GRB 100316D. Searching the Fermi catalog for possible gamma-rays reveals that GRB 161228B is spatially and temporally compatible with iPTF17cw. The similarity to SN 1998bw and SN 2009bb, the radio and X-ray detections, and the potential association with GRB 161228B all point to iPTF17cw being a new candidate member of the rare sample of optically discovered engine-driven BL-Ic SNe associated with relativistic ejecta.

Corsi, A.↗
DOE OSTI2020

Materials Data on Sc(MnSn)6 by Materials Project

ScMn6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sc is bonded to eight Sn atoms to form distorted edge-sharing ScSn8 hexagonal bipyramids. There are two shorter (2.93 Å) and six longer (3.12 Å) Sc–Sn bond lengths. Mn is bonded in a 12-coordinate geometry to six Sn atoms. There are a spread of Mn–Sn bond distances ranging from 2.72–2.80 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 7-coordinate geometry to one Sc and six equivalent Mn atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Mn atoms. In the third Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Sc and six equivalent Mn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(ZnSn)2 by Materials Project

EuZn2Sn2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eight Zn and eight Sn atoms. There are four shorter (3.54 Å) and four longer (3.61 Å) Eu–Zn bond lengths. There are four shorter (3.51 Å) and four longer (3.72 Å) Eu–Sn bond lengths. There are two inequivalent Zn sites. In the first Zn site, Zn is bonded to four equivalent Eu and four equivalent Sn atoms to form distorted ZnEu4Sn4 tetrahedra that share corners with twelve equivalent SnEu4Zn4 tetrahedra, edges with two equivalent SnEu4Zn4 tetrahedra, edges with four equivalent ZnEu4Sn4 tetrahedra, and faces with four equivalent ZnEu4Sn4 tetrahedra. All Zn–Sn bond lengths are 2.76 Å. In the second Zn site, Zn is bonded in a 9-coordinate geometry to four equivalent Eu and five Sn atoms. There are one shorter (2.60 Å) and four longer (2.80 Å) Zn–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded to four equivalent Eu and four equivalent Zn atoms to form distorted SnEu4Zn4 tetrahedra that share corners with twelve equivalent ZnEu4Sn4 tetrahedra, edges with two equivalent ZnEu4Sn4 tetrahedra, edges with four equivalent SnEu4Zn4 tetrahedra, and faces with four equivalent SnEu4Zn4 tetrahedra. In the second Sn site, Sn is bonded in a 9-coordinate geometry to four equivalent Eu and five Zn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThCu5Sn by Materials Project

ThCu5Sn crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Th is bonded in a 6-coordinate geometry to fifteen Cu and four equivalent Sn atoms. There are a spread of Th–Cu bond distances ranging from 2.88–3.34 Å. There are a spread of Th–Sn bond distances ranging from 3.31–3.42 Å. There are four inequivalent Cu sites. In the first Cu site, Cu is bonded to three equivalent Th, seven Cu, and two equivalent Sn atoms to form a mixture of corner, edge, and face-sharing CuTh3Cu7Sn2 cuboctahedra. There are a spread of Cu–Cu bond distances ranging from 2.51–2.55 Å. There are one shorter (2.78 Å) and one longer (2.80 Å) Cu–Sn bond lengths. In the second Cu site, Cu is bonded in a 11-coordinate geometry to three equivalent Th, five Cu, and three equivalent Sn atoms. There are two shorter (2.59 Å) and one longer (3.07 Å) Cu–Cu bond lengths. There are one shorter (2.65 Å) and two longer (3.08 Å) Cu–Sn bond lengths. In the third Cu site, Cu is bonded to three equivalent Th, seven Cu, and two equivalent Sn atoms to form a mixture of corner, edge, and face-sharing CuTh3Cu7Sn2 cuboctahedra. The Cu–Cu bond length is 2.54 Å. Both Cu–Sn bond lengths are 2.83 Å. In the fourth Cu site, Cu is bonded in a 12-coordinate geometry to three equivalent Th, eight Cu, and one Sn atom. Both Cu–Cu bond lengths are 2.91 Å. The Cu–Sn bond length is 2.86 Å. Sn is bonded in a 1-coordinate geometry to four equivalent Th and ten Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(ZnSn)2 by Materials Project

BaZn2Sn2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ba is bonded in a 12-coordinate geometry to eight Zn and eight Sn atoms. There are four shorter (3.66 Å) and four longer (3.68 Å) Ba–Zn bond lengths. There are four shorter (3.65 Å) and four longer (3.81 Å) Ba–Sn bond lengths. There are two inequivalent Zn sites. In the first Zn site, Zn is bonded in a 9-coordinate geometry to four equivalent Ba and five Sn atoms. There are one shorter (2.71 Å) and four longer (2.86 Å) Zn–Sn bond lengths. In the second Zn site, Zn is bonded in a 4-coordinate geometry to four equivalent Ba and four equivalent Sn atoms. All Zn–Sn bond lengths are 2.81 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to four equivalent Ba and five Zn atoms. In the second Sn site, Sn is bonded to four equivalent Ba and four equivalent Zn atoms to form a mixture of distorted edge and face-sharing SnBa4Zn4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn3F8 by Materials Project

Sn3F8 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of one Sn3F8 sheet oriented in the (-1, 0, 2) direction. there are two inequivalent Sn+2.67+ sites. In the first Sn+2.67+ site, Sn+2.67+ is bonded in a 4-coordinate geometry to five F1- atoms. There are a spread of Sn–F bond distances ranging from 2.15–2.71 Å. In the second Sn+2.67+ site, Sn+2.67+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Sn–F bond distances ranging from 1.99–2.03 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a bent 150 degrees geometry to two equivalent Sn+2.67+ atoms. In the second F1- site, F1- is bonded in a single-bond geometry to two Sn+2.67+ atoms. In the third F1- site, F1- is bonded in a 2-coordinate geometry to two Sn+2.67+ atoms. In the fourth F1- site, F1- is bonded in a bent 150 degrees geometry to two Sn+2.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3Sn4Au by Materials Project

K3AuSn4 crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 12-coordinate geometry to two equivalent Au and four equivalent Sn atoms. Both K–Au bond lengths are 3.58 Å. There are two shorter (3.71 Å) and two longer (3.92 Å) K–Sn bond lengths. In the second K site, K is bonded in a 1-coordinate geometry to one Au and eight Sn atoms. The K–Au bond length is 3.39 Å. There are a spread of K–Sn bond distances ranging from 3.71–3.97 Å. Au is bonded in a 8-coordinate geometry to four K and four Sn atoms. There are two shorter (2.84 Å) and two longer (2.85 Å) Au–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 1-coordinate geometry to four equivalent K and one Au atom. In the second Sn site, Sn is bonded in a 1-coordinate geometry to six K and one Au atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd(NiSn)2 by Materials Project

Nd(NiSn)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Nd is bonded in a 12-coordinate geometry to eight Ni and eight Sn atoms. There are four shorter (3.31 Å) and four longer (3.43 Å) Nd–Ni bond lengths. There are four shorter (3.37 Å) and four longer (3.44 Å) Nd–Sn bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 9-coordinate geometry to four equivalent Nd and five Sn atoms. There are one shorter (2.51 Å) and four longer (2.58 Å) Ni–Sn bond lengths. In the second Ni site, Ni is bonded in a 8-coordinate geometry to four equivalent Nd and four equivalent Sn atoms. All Ni–Sn bond lengths are 2.57 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to four equivalent Nd and five Ni atoms. In the second Sn site, Sn is bonded in a 12-coordinate geometry to four equivalent Nd and four equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn7Ir5 by Materials Project

Ir5Sn7 crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. there are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 7-coordinate geometry to seven Sn atoms. There are a spread of Ir–Sn bond distances ranging from 2.72–2.88 Å. In the second Ir site, Ir is bonded in a square pyramidal geometry to five Sn atoms. All Ir–Sn bond lengths are 2.63 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 5-coordinate geometry to five Ir atoms. In the second Sn site, Sn is bonded to four equivalent Ir atoms to form distorted edge-sharing SnIr4 tetrahedra. In the third Sn site, Sn is bonded in a 5-coordinate geometry to five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(SnIr)2 by Materials Project

Ce(IrSn)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ce is bonded in a 12-coordinate geometry to eight Ir and eight Sn atoms. There are four shorter (3.40 Å) and four longer (3.50 Å) Ce–Ir bond lengths. There are four shorter (3.38 Å) and four longer (3.56 Å) Ce–Sn bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Ce and five Sn atoms. There are one shorter (2.59 Å) and four longer (2.66 Å) Ir–Sn bond lengths. In the second Ir site, Ir is bonded to four equivalent Ce and four equivalent Sn atoms to form distorted IrCe4Sn4 tetrahedra that share corners with twelve equivalent SnCe4Ir4 tetrahedra, edges with two equivalent SnCe4Ir4 tetrahedra, edges with four equivalent IrCe4Sn4 tetrahedra, and faces with four equivalent IrCe4Sn4 tetrahedra. All Ir–Sn bond lengths are 2.64 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to four equivalent Ce and five Ir atoms. In the second Sn site, Sn is bonded to four equivalent Ce and four equivalent Ir atoms to form distorted SnCe4Ir4 tetrahedra that share corners with twelve equivalent IrCe4Sn4 tetrahedra, edges with two equivalent IrCe4Sn4 tetrahedra, edges with four equivalent SnCe4Ir4 tetrahedra, and faces with four equivalent SnCe4Ir4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UFe5Sn by Materials Project

UFe5Sn is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. U is bonded in a 2-coordinate geometry to fifteen Fe and four equivalent Sn atoms. There are a spread of U–Fe bond distances ranging from 2.61–3.32 Å. There are a spread of U–Sn bond distances ranging from 3.25–3.32 Å. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded in a 11-coordinate geometry to three equivalent U, five Fe, and three equivalent Sn atoms. There are a spread of Fe–Fe bond distances ranging from 2.48–2.76 Å. There are one shorter (2.61 Å) and two longer (2.86 Å) Fe–Sn bond lengths. In the second Fe site, Fe is bonded in a 2-coordinate geometry to three equivalent U, six Fe, and one Sn atom. There are a spread of Fe–Fe bond distances ranging from 2.43–2.51 Å. The Fe–Sn bond length is 2.74 Å. In the third Fe site, Fe is bonded to three equivalent U, seven Fe, and two equivalent Sn atoms to form a mixture of distorted face, edge, and corner-sharing FeU3Fe7Sn2 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.34–2.46 Å. There are one shorter (2.71 Å) and one longer (2.73 Å) Fe–Sn bond lengths. In the fourth Fe site, Fe is bonded to three equivalent U, seven Fe, and two equivalent Sn atoms to form a mixture of distorted face, edge, and corner-sharing FeU3Fe7Sn2 cuboctahedra. Both Fe–Sn bond lengths are 2.66 Å. Sn is bonded in a 1-coordinate geometry to four equivalent U and ten Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn4(PO4)3 by Materials Project

Sn4(PO4)3 crystallizes in the trigonal R3c space group. The structure is three-dimensional. there are two inequivalent Sn+2.25+ sites. In the first Sn+2.25+ site, Sn+2.25+ is bonded in a distorted T-shaped geometry to three O2- atoms. There are a spread of Sn–O bond distances ranging from 2.08–2.11 Å. In the second Sn+2.25+ site, Sn+2.25+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All Sn–O bond lengths are 2.15 Å. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Sn+2.25+ and one P5+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one Sn+2.25+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn+2.25+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Sn+2.25+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu6Ni2Sn by Materials Project

Lu6Ni2Sn crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are three inequivalent Lu sites. In the first Lu site, Lu is bonded in a 4-coordinate geometry to three Ni and one Sn atom. There are one shorter (2.66 Å) and two longer (2.84 Å) Lu–Ni bond lengths. The Lu–Sn bond length is 3.30 Å. In the second Lu site, Lu is bonded in a 5-coordinate geometry to three Ni and two Sn atoms. There are two shorter (2.85 Å) and one longer (3.09 Å) Lu–Ni bond lengths. There are one shorter (3.17 Å) and one longer (3.54 Å) Lu–Sn bond lengths. In the third Lu site, Lu is bonded in a distorted rectangular see-saw-like geometry to two Ni and two Sn atoms. There are one shorter (2.69 Å) and one longer (3.10 Å) Lu–Ni bond lengths. There are one shorter (3.04 Å) and one longer (3.28 Å) Lu–Sn bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 2-coordinate geometry to eight Lu atoms. In the second Ni site, Ni is bonded in a 9-coordinate geometry to eight Lu and one Ni atom. The Ni–Ni bond length is 2.48 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a distorted body-centered cubic geometry to eight Lu atoms. In the second Sn site, Sn is bonded in a cuboctahedral geometry to twelve Lu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er6Ni2Sn by Materials Project

Er6Ni2Sn crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are three inequivalent Er sites. In the first Er site, Er is bonded in a 4-coordinate geometry to three Ni and one Sn atom. There are one shorter (2.69 Å) and two longer (2.87 Å) Er–Ni bond lengths. The Er–Sn bond length is 3.35 Å. In the second Er site, Er is bonded in a 4-coordinate geometry to two Ni and two Sn atoms. There are one shorter (2.73 Å) and one longer (3.18 Å) Er–Ni bond lengths. There are one shorter (3.06 Å) and one longer (3.33 Å) Er–Sn bond lengths. In the third Er site, Er is bonded in a 5-coordinate geometry to three Ni and two Sn atoms. There are two shorter (2.88 Å) and one longer (3.13 Å) Er–Ni bond lengths. There are one shorter (3.21 Å) and one longer (3.60 Å) Er–Sn bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 9-coordinate geometry to eight Er and one Ni atom. The Ni–Ni bond length is 2.49 Å. In the second Ni site, Ni is bonded in a 2-coordinate geometry to eight Er atoms. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a cuboctahedral geometry to twelve Er atoms. In the second Sn site, Sn is bonded in a body-centered cubic geometry to eight Er atoms.

36 MATERIALS SCIENCE↗