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At least 127 records · Page 7
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Cs2LiCo(CN)6 by Materials Project

Cs2Li(CN)6Co crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four cobalt molecules and one Cs2Li(CN)6 framework. In the Cs2Li(CN)6 framework, Cs1+ is bonded to twelve equivalent N3- atoms to form distorted CsN12 cuboctahedra that share corners with twelve equivalent CsN12 cuboctahedra, faces with six equivalent CsN12 cuboctahedra, and faces with four equivalent LiN6 octahedra. All Cs–N bond lengths are 3.77 Å. Li1+ is bonded to six equivalent N3- atoms to form LiN6 octahedra that share faces with eight equivalent CsN12 cuboctahedra. All Li–N bond lengths are 2.25 Å. C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to four equivalent Cs1+, one Li1+, and one C+2.33+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2NaCo(CN)6 by Materials Project

Rb2Na(CN)6Co crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two cobalt molecules and one Rb2Na(CN)6 framework. In the Rb2Na(CN)6 framework, Rb1+ is bonded in a 7-coordinate geometry to seven N3- atoms. There are a spread of Rb–N bond distances ranging from 3.07–3.66 Å. Na1+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of Na–N bond distances ranging from 2.53–2.57 Å. There are three inequivalent C+2.33+ sites. In the first C+2.33+ site, C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C+2.33+ site, C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the third C+2.33+ site, C+2.33+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a 2-coordinate geometry to two equivalent Rb1+, one Na1+, and one C+2.33+ atom. In the second N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent Rb1+, one Na1+, and one C+2.33+ atom. In the third N3- site, N3- is bonded in a 2-coordinate geometry to three equivalent Rb1+, one Na1+, and one C+2.33+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2MgFe(CN)6 by Materials Project

Cs2Mg(CN)6Fe crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four iron molecules and one Cs2Mg(CN)6 framework. In the Cs2Mg(CN)6 framework, Cs1+ is bonded to twelve equivalent N3- atoms to form distorted CsN12 cuboctahedra that share corners with twelve equivalent CsN12 cuboctahedra, faces with six equivalent CsN12 cuboctahedra, and faces with four equivalent MgN6 octahedra. All Cs–N bond lengths are 3.73 Å. Mg2+ is bonded to six equivalent N3- atoms to form MgN6 octahedra that share faces with eight equivalent CsN12 cuboctahedra. All Mg–N bond lengths are 2.17 Å. C+1.83+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to four equivalent Cs1+, one Mg2+, and one C+1.83+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Ni(CN)4 by Materials Project

K2Ni(CN)4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two nickel molecules and one K(CN)2 framework. In the K(CN)2 framework, K1+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of K–N bond distances ranging from 2.82–3.25 Å. There are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a 1-coordinate geometry to three equivalent K1+ and one C2+ atom. In the second N3- site, N3- is bonded in a 1-coordinate geometry to three equivalent K1+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Co2Cu3(CN)12 by Materials Project

Cu(CoCu(CN)6)2 crystallizes in the tetragonal P-4m2 space group. The structure is two-dimensional and consists of one copper molecule and one CoCu(CN)6 sheet oriented in the (0, 0, 1) direction. In the CoCu(CN)6 sheet, Co+1.50+ is bonded in a distorted octahedral geometry to five C+2.50+ atoms. There is four shorter (1.86 Å) and one longer (1.87 Å) Co–C bond length. Cu1+ is bonded in an octahedral geometry to six N3- atoms. There are five shorter (2.02 Å) and one longer (2.09 Å) Cu–N bond lengths. There are three inequivalent C+2.50+ sites. In the first C+2.50+ site, C+2.50+ is bonded in a distorted linear geometry to one Co+1.50+ and one N3- atom. The C–N bond length is 1.17 Å. In the second C+2.50+ site, C+2.50+ is bonded in a distorted single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. In the third C+2.50+ site, C+2.50+ is bonded in a distorted linear geometry to one Co+1.50+ and one N3- atom. The C–N bond length is 1.17 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a linear geometry to one Cu1+ and one C+2.50+ atom. In the second N3- site, N3- is bonded in a linear geometry to one Cu1+ and one C+2.50+ atom. In the third N3- site, N3- is bonded in a linear geometry to one Cu1+ and one C+2.50+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2CdFe(CN)6 by Materials Project

FeCs2Cd(CN)6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four iron molecules and one Cs2Cd(CN)6 framework. In the Cs2Cd(CN)6 framework, Cs1+ is bonded to twelve equivalent N3- atoms to form distorted CsN12 cuboctahedra that share corners with twelve equivalent CsN12 cuboctahedra, faces with six equivalent CsN12 cuboctahedra, and faces with four equivalent CdN6 octahedra. All Cs–N bond lengths are 3.83 Å. Cd2+ is bonded to six equivalent N3- atoms to form CdN6 octahedra that share faces with eight equivalent CsN12 cuboctahedra. All Cd–N bond lengths are 2.33 Å. C+1.83+ is bonded in a distorted single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to four equivalent Cs1+, one Cd2+, and one C+1.83+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cd3Co2(CN)12 by Materials Project

Cd(CoCd(CN)6)2 is alpha Rhenium trioxide-derived structured and crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional and consists of one cadmium molecule and one CoCd(CN)6 framework. In the CoCd(CN)6 framework, there are two inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded in an octahedral geometry to six C+2.17+ atoms. All Co–C bond lengths are 1.87 Å. In the second Co2+ site, Co2+ is bonded in an octahedral geometry to six C+2.17+ atoms. All Co–C bond lengths are 1.87 Å. Cd2+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of Cd–N bond distances ranging from 2.27–2.41 Å. There are three inequivalent C+2.17+ sites. In the first C+2.17+ site, C+2.17+ is bonded in a linear geometry to one Co2+ and one N3- atom. The C–N bond length is 1.17 Å. In the second C+2.17+ site, C+2.17+ is bonded in a linear geometry to one Co2+ and one N3- atom. The C–N bond length is 1.17 Å. In the third C+2.17+ site, C+2.17+ is bonded in a linear geometry to one Co2+ and one N3- atom. The C–N bond length is 1.17 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a linear geometry to one Cd2+ and one C+2.17+ atom. In the second N3- site, N3- is bonded in a linear geometry to one Cd2+ and one C+2.17+ atom. In the third N3- site, N3- is bonded in a linear geometry to one Cd2+ and one C+2.17+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KGaFe(CN)6 by Materials Project

KFeGa(CN)6 is half-Heusler structured and crystallizes in the cubic F-43m space group. The structure is zero-dimensional and consists of four ferrum molecules, four kalium molecules, and four Ga(CN)6 clusters. In each Ga(CN)6 cluster, Ga3+ is bonded in an octahedral geometry to six equivalent N3- atoms. All Ga–N bond lengths are 2.04 Å. C+1.83+ is bonded in a distorted single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to one Ga3+ and one C+1.83+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2KCr(CN)6 by Materials Project

Cs2K(CN)6Cr crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two chromium molecules and one Cs2K(CN)6 framework. In the Cs2K(CN)6 framework, Cs1+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Cs–N bond distances ranging from 3.26–3.58 Å. K1+ is bonded in an octahedral geometry to six N3- atoms. There are four shorter (2.89 Å) and two longer (2.93 Å) K–N bond lengths. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the third C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a 1-coordinate geometry to one Cs1+, one K1+, and one C2+ atom. In the second N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent Cs1+, one K1+, and one C2+ atom. In the third N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent Cs1+, one K1+, and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn3Co2(CN)12 by Materials Project

Zn(CoZn(CN)6)2 is High-temperature superconductor-derived structured and crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional and consists of one CoZn(CN)6 framework and one zinc molecule. In the CoZn(CN)6 framework, there are two inequivalent Co2+ sites. In the first Co2+ site, Co2+ is bonded in an octahedral geometry to six C+2.17+ atoms. All Co–C bond lengths are 1.87 Å. In the second Co2+ site, Co2+ is bonded in an octahedral geometry to six C+2.17+ atoms. All Co–C bond lengths are 1.87 Å. Zn2+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of Zn–N bond distances ranging from 2.08–2.17 Å. There are three inequivalent C+2.17+ sites. In the first C+2.17+ site, C+2.17+ is bonded in a linear geometry to one Co2+ and one N3- atom. The C–N bond length is 1.17 Å. In the second C+2.17+ site, C+2.17+ is bonded in a linear geometry to one Co2+ and one N3- atom. The C–N bond length is 1.17 Å. In the third C+2.17+ site, C+2.17+ is bonded in a linear geometry to one Co2+ and one N3- atom. The C–N bond length is 1.17 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a linear geometry to one Zn2+ and one C+2.17+ atom. In the second N3- site, N3- is bonded in a linear geometry to one Zn2+ and one C+2.17+ atom. In the third N3- site, N3- is bonded in a linear geometry to one Zn2+ and one C+2.17+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2LiFe(CN)6 by Materials Project

(Cs)2LiFe(CN)6 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of eight cesium molecules, four lithium molecules, and four Fe(CN)6 clusters. In each Fe(CN)6 cluster, Fe3+ is bonded in an octahedral geometry to six equivalent N3- atoms. All Fe–N bond lengths are 1.90 Å. C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to one Fe3+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2MnFe(CN)6 by Materials Project

Rb2Mn(CN)6Fe crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four iron molecules and one Rb2Mn(CN)6 framework. In the Rb2Mn(CN)6 framework, Rb1+ is bonded to twelve equivalent N3- atoms to form distorted RbN12 cuboctahedra that share corners with twelve equivalent RbN12 cuboctahedra, faces with six equivalent RbN12 cuboctahedra, and faces with four equivalent MnN6 octahedra. All Rb–N bond lengths are 3.59 Å. Mn2+ is bonded to six equivalent N3- atoms to form MnN6 octahedra that share faces with eight equivalent RbN12 cuboctahedra. All Mn–N bond lengths are 1.95 Å. C+1.83+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to four equivalent Rb1+, one Mn2+, and one C+1.83+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn3Rh2(CN)12 by Materials Project

(Rh)2Zn(Zn(CN)6)2 crystallizes in the tetragonal P-4m2 space group. The structure is zero-dimensional and consists of two rhodium molecules, two Zn(CN)6 clusters, and one zinc molecule. In each Zn(CN)6 cluster, Zn2+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of Zn–N bond distances ranging from 2.11–2.17 Å. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. In the third C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a linear geometry to one Zn2+ and one C2+ atom. In the second N3- site, N3- is bonded in a linear geometry to one Zn2+ and one C2+ atom. In the third N3- site, N3- is bonded in a linear geometry to one Zn2+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Large negative thermal expansion in GdFe(CN) 6 driven by unusual low-frequency modes

Understanding the negative thermal expansion (NTE) mechanism is of great importance. In this work, we consider the new NTE compound GdFe(CN) 6 (αv = -34.2×10 -6 K -1 ) as a case study to investigate the NTE mechanism from the perspective of the lattice vibrational dynamics. The atomic mean-square displacements suggest that the NTE of GdFe(CN) 6 comes from the strong tension effect induced by the transverse vibrations of the atomic –Fe–Ctriple bondN–Gd– linkages, with the largest contribution given by N atoms. Lattice dynamics calculations show that three low-frequency optical modes at about 50 cm -1 show the largest negative Grüneisen parameters thus providing the largest contribution to the NTE. In conclusion, the existence of these unusual low-frequency vibrational modes can be ascribed to the presence of GdN 6 trigonal prisms in the framework structure of GdFe(CN) 6 .

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2024

Site Disorder Drives Cyanide Dynamics and Fast Ion Transport in Li 6 PS 5 CN

Halide argyrodite solid-state electrolytes of the general formula Li 6 PS 5 X exhibit complex static and dynamic disorder that plays a crucial role in ion transport processes. Here, we unravel the rich interplay between site disorder and dynamics in the plastic crystal argyrodite Li 6 PS 5 CN and the impact on ion diffusion processes through a suite of experimental and computational methodologies, including temperature-dependent synchrotron powder X-ray diffraction, AC electrochemical impedance spectroscopy, 7 Li solid-state NMR, and machine learning-assisted molecular dynamics simulations. Sulfide and (pseudo)halide site disorder between the two anion sublattices unilaterally improves long-range lithium diffusion irrespective of the (pseudo)halide identity, which demonstrates the importance of site disorder in dictating bulk ionic conductivity in the argyrodite family. Furthermore, we find that anion site disorder modulates the presence and time scales of cyanide rotational dynamics. Ordered configurations of anions enable fast, quasi-free rotations of cyanides that occur on time scales of 10 11 Hz at T = 300 K. In contrast, we find that cyanide dynamics are slow or frozen in Li 6 PS 5 CN when site disorder between the cyanide and sulfide sublattices is present at T = 300 K. We rationalize the observed differences in cyanide dynamics in the context of elastic dipole interactions between neighboring cyanide anions and local strain induced by the configurations of site disorder that may impact the energetic landscape for cyanide rotational dynamics. Through this study, we find that anion disorder plays a decisive role in dictating the extent and time scales of both lithium ion and cyanide dynamics in Li 6 PS 5 CN.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Modelling CN Zeeman effect observations of the envelopes of a low-mass protostellar disc and a massive protostar

We use the POLARIS radiative transfer code to produce simulated circular polarization Zeeman emission maps of the cyanide (CN) J = 1–0 molecular line transition for two types of protostellar envelope magnetohydrodynamic simulations. Our first model is a low-mass disc envelope system (box length L = 200 au), and our second model is the envelope of a massive protostar (L = 104 au) with a protostellar wind and a CN-enhanced outflow shell. We compute the velocity-integrated Stokes I and V, as well as the implied V/I polarization percentage, for each detector pixel location in our simulated emission maps. Our results show that both types of protostellar environments are in principle accessible with current circular polarization instruments, with each containing swaths of envelope area that yield percentage polarizations that exceed the 1.8 percent nominal sensitivity limit for circular polarization experiments with the Atacama Large Millimeter/submillimeter Array. In both systems, high-polarization (≳1.8 percent) pixels tend to lie at an intermediate distance away from the central star and where the line-centre opacity of the CN emission is moderately optically thin (τLC ~ 0.1–1). Furthermore, our computed V/I values scale roughly with the density-weighted mean line-of-sight magnetic field strength, indicating that Zeeman observations can effectively diagnose the strength of envelope-scale magnetic fields. We also find that pixels with large V/I are preferentially co-located where the absolute value of the velocity-integrated V is also large, suggesting that locations with favourable percentage polarization are also favourable in terms of raw signal.

79 ASTRONOMY AND ASTROPHYSICS↗
DOE OSTI2021

Charge localization in strongly correlated {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]I due to inherent disorder.

To understand the physical properties of the series of organic conductors kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]X with X = Cl, Br, and I, not only electronic correlations, but also the effect of disorder has to be taken into account. While for Cl- and Br-containing salts the influence of both parameters were investigated and a universal phase diagram was proposed, the position of kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]I is still not settled. Here we conducted transport, infrared, and dielectric measurements on single crystals of the title compound to clarify its electronic state at low temperatures. The correlation strength was determined as U/W approximate to 2.2; thus this salt is placed deeper in an insulating state compared to the two sister compounds. We found that inherent disorder leads to a Coulomb localized insulating state similar to the moderately x-ray-irradiated kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl.

Iakutkina, O.↗
DOE OSTI2020

Probing UV-sensitive Pathways for CN and HCN Formation in Protoplanetary Disks with the Hubble Space Telescope

The UV radiation field is a critical regulator of gas-phase chemistry in surface layers of disks around young stars. In an effort to understand the relationship between photocatalyzing UV radiation fields and gas emission observed at infrared and submillimeter wavelengths, we present an analysis of new and archival Hubble Space Telescope (HST), Spitzer, ALMA, IRAM, and SMA data for five targets in the Lupus cloud complex and 14 systems in Taurus-Auriga. The HST spectra were used to measure Lyα and far-UV (FUV) continuum fluxes reaching the disk surface, which are responsible for dissociating relevant molecular species (e.g., HCN, N{sub 2}). Semi-forbidden C ii] λ2325 and UV-fluorescent H{sub 2} emission were also measured to constrain inner disk populations of C{sup +} and vibrationally excited H{sub 2}. We find a significant positive correlation between 14 μm HCN emission and fluxes from the FUV continuum and C ii] λ2325, consistent with model predictions requiring N{sub 2} photodissociation and carbon ionization to trigger the main CN/HCN formation pathways. We also report significant negative correlations between submillimeter CN emission and both C ii] and FUV continuum fluxes, implying that CN is also more readily dissociated in disks with stronger FUV irradiation. No clear relationships are detected between either CN or HCN and Lyα or UV-H{sub 2} emission. This is attributed to the spatial stratification of the various molecular species, which span several vertical layers and radii across the inner and outer disk. We expect that future observations with the James Webb Space Telescope will build on this work by enabling more sensitive IR surveys than were possible with Spitzer.

79 ASTRONOMY AND ASTROPHYSICS↗