Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “planar structures”

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 685 records · Page 38
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba(NiO2)4 by Materials Project

Ba(NiO2)4 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ba2+ is bonded in a hexagonal planar geometry to six equivalent O2- atoms. All Ba–O bond lengths are 2.69 Å. There are two inequivalent Ni+3.50+ sites. In the first Ni+3.50+ site, Ni+3.50+ is bonded to six equivalent O2- atoms to form edge-sharing NiO6 octahedra. All Ni–O bond lengths are 2.02 Å. In the second Ni+3.50+ site, Ni+3.50+ is bonded to six O2- atoms to form edge-sharing NiO6 octahedra. There is four shorter (1.89 Å) and two longer (1.91 Å) Ni–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+ and three Ni+3.50+ atoms. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to three equivalent Ni+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Inherent stochasticity during insulator–metal transition in VO 2

Vanadium dioxide (VO 2 ), which exhibits a near-room-temperature insulator–metal transition, has great potential in applications of neuromorphic computing devices. Although its volatile switching property, which could emulate neuron spiking, has been studied widely, nanoscale studies of the structural stochasticity across the phase transition are still lacking. In this study, using in situ transmission electron microscopy and ex situ resistive switching measurement, we successfully characterized the structural phase transition between monoclinic and rutile VO 2 at local areas in planar VO 2 /TiO 2 device configuration under external biasing. After each resistive switching, different VO 2 monoclinic crystal orientations are observed, forming different equilibrium states. We have evaluated a statistical cycle-to-cycle variation, demonstrated a stochastic nature of the volatile resistive switching, and presented an approach to study in-plane structural anisotropy. Furthermore, our microscopic studies move a big step forward toward understanding the volatile switching mechanisms and the related applications of VO 2 as the key material of neuromorphic computing.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiTiCl3 by Materials Project

LiTiCl3 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Li1+ is bonded in a square co-planar geometry to four equivalent Cl1- atoms. All Li–Cl bond lengths are 2.53 Å. Ti2+ is bonded to six Cl1- atoms to form corner-sharing TiCl6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.43 Å) and four longer (2.53 Å) Ti–Cl bond lengths. There are two inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a square co-planar geometry to two equivalent Li1+ and two equivalent Ti2+ atoms. In the second Cl1- site, Cl1- is bonded in a linear geometry to two equivalent Ti2+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1973

Tensile properties to 650 C and deformation structures in a precipitation strengthened titanium-aluminum alloy

Appreciable strength levels were retained to 650 C in a Ti-10Al-1Si alloy aged in the (alpha + alpha sub 2) phase field to yield optimum room temperature strength and ductility. The aging treatment precipitated a uniform distribution of alpha sub 2-particles such that, at room temperature, dislocations bypassed instead of shearing the particles at low strains. Specimens fractured at room temperature exhibited fine uniform dimples even for those aging conditions that imparted no macroscopic ductility. The main crack appeared to propagate through the planar slip bands that had cut through the alpha sub 2-particles. A two-step aging process produced a higher volume fraction of bimodally distributed alpha sub 2-particles that led to higher strength levels at elevated temperatures. Both for the single size and the bimodal alpha sub 2-particle distributions, elevated-temperature deformation structures consisted mainly of planar slip bands that sheared through the alpha sub 2-particles.

Mendiratta, M. G.↗
DOE OSTI2020

Materials Data on KIn(MoSe)6 by Materials Project

KIn(MoSe)6 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. K is bonded in a trigonal planar geometry to three Se atoms. There are one shorter (3.21 Å) and two longer (3.22 Å) K–Se bond lengths. There are six inequivalent Mo sites. In the first Mo site, Mo is bonded in a distorted see-saw-like geometry to six Mo and four Se atoms. There are a spread of Mo–Mo bond distances ranging from 2.67–2.74 Å. There are a spread of Mo–Se bond distances ranging from 2.61–2.72 Å. In the second Mo site, Mo is bonded in a distorted see-saw-like geometry to six Mo and four Se atoms. There are one shorter (2.66 Å) and four longer (2.74 Å) Mo–Mo bond lengths. There are a spread of Mo–Se bond distances ranging from 2.62–2.72 Å. In the third Mo site, Mo is bonded in a distorted see-saw-like geometry to six Mo and four Se atoms. There are two shorter (2.73 Å) and two longer (2.74 Å) Mo–Mo bond lengths. There are a spread of Mo–Se bond distances ranging from 2.63–2.72 Å. In the fourth Mo site, Mo is bonded in a distorted see-saw-like geometry to six Mo and four Se atoms. There are one shorter (2.67 Å) and one longer (2.68 Å) Mo–Mo bond lengths. There are a spread of Mo–Se bond distances ranging from 2.64–2.72 Å. In the fifth Mo site, Mo is bonded in a distorted see-saw-like geometry to six Mo and four Se atoms. The Mo–Mo bond length is 2.66 Å. There are a spread of Mo–Se bond distances ranging from 2.65–2.72 Å. In the sixth Mo site, Mo is bonded in a distorted see-saw-like geometry to six Mo and four Se atoms. There are a spread of Mo–Se bond distances ranging from 2.63–2.72 Å. In is bonded in a trigonal planar geometry to three Se atoms. There are one shorter (3.16 Å) and two longer (3.17 Å) In–Se bond lengths. There are six inequivalent Se sites. In the first Se site, Se is bonded in a 5-coordinate geometry to one K and four Mo atoms. In the second Se site, Se is bonded in a 5-coordinate geometry to one K and four Mo atoms. In the third Se site, Se is bonded in a 5-coordinate geometry to one K and four Mo atoms. In the fourth Se site, Se is bonded in a 5-coordinate geometry to four Mo and one In atom. In the fifth Se site, Se is bonded in a 5-coordinate geometry to four Mo and one In atom. In the sixth Se site, Se is bonded in a 5-coordinate geometry to four Mo and one In atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaLi2(MgSi)2 by Materials Project

Li2Ba(MgSi)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Li1+ is bonded in a trigonal planar geometry to three equivalent Si4- atoms. All Li–Si bond lengths are 2.65 Å. Ba2+ is bonded to six equivalent Si4- atoms to form BaSi6 octahedra that share corners with eighteen equivalent MgSi4 tetrahedra, edges with six equivalent BaSi6 octahedra, and faces with two equivalent MgSi4 tetrahedra. All Ba–Si bond lengths are 3.56 Å. Mg2+ is bonded to four equivalent Si4- atoms to form MgSi4 tetrahedra that share corners with nine equivalent BaSi6 octahedra, corners with six equivalent MgSi4 tetrahedra, edges with three equivalent MgSi4 tetrahedra, and a faceface with one BaSi6 octahedra. The corner-sharing octahedra tilt angles range from 48–52°. There are one shorter (2.78 Å) and three longer (2.89 Å) Mg–Si bond lengths. Si4- is bonded in a 10-coordinate geometry to three equivalent Li1+, three equivalent Ba2+, and four equivalent Mg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Multi-layering of SU-8 exhibits distinct geometrical transitions from circular to planarized profiles

The negative tone photoresist SU-8 permits the creation of micrometer-scale structures by optical lithography. It is also the most used photoresist in soft lithography for the fast-prototyping of microfluidic devices. Despite its importance, the effect of capillary forces on SU-8 multi-layering onto topographical features has not been thoroughly studied. In particular, the profile of the added layer has not been examined in detail. The overlaying process exhibits a set of distinct behaviors, or regimes, depending on the relative thickness of the overlay and the underlying rectangular pattern. We demonstrate how capillary effects control the profile of multi-layer microchannels in a predictable manner. We derive a simple static model to describe the evolution of the overlay as a function of dimensionless geometric parameters. Our study provides a critical understanding of the parameters that govern multi-layer spin coating.

Sauzade, Martin↗
DOE OSTI2020

Materials Data on Mn2N by Materials Project

Mn2N is zeta iron carbide-like structured and crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. Mn is bonded in a distorted trigonal planar geometry to three equivalent N atoms. There are a spread of Mn–N bond distances ranging from 1.93–1.96 Å. N is bonded to six equivalent Mn atoms to form a mixture of edge and corner-sharing NMn6 octahedra. The corner-sharing octahedra tilt angles range from 49–50°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiMo(PO4)2 by Materials Project

LiMo(PO4)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Li1+ is bonded in a distorted trigonal planar geometry to three O2- atoms. There are a spread of Li–O bond distances ranging from 1.83–2.55 Å. Mo5+ is bonded to six O2- atoms to form MoO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Mo–O bond distances ranging from 1.91–2.11 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent MoO6 octahedra. The corner-sharing octahedra tilt angles range from 17–43°. There are a spread of P–O bond distances ranging from 1.48–1.59 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent MoO6 octahedra. The corner-sharing octahedra tilt angles range from 16–50°. There are a spread of P–O bond distances ranging from 1.49–1.59 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Mo5+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to one Mo5+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mo5+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one Mo5+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to one Li1+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Li1+, one Mo5+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mo5+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a linear geometry to one Li1+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UGa3Pd2 by Materials Project

UPd2Ga3 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. U is bonded in a distorted hexagonal planar geometry to six equivalent Pd atoms. All U–Pd bond lengths are 3.08 Å. Pd is bonded in a 12-coordinate geometry to three equivalent U and six equivalent Ga atoms. All Pd–Ga bond lengths are 2.65 Å. Ga is bonded in a 12-coordinate geometry to four equivalent Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThMn3Ni2 by Materials Project

ThMn3Ni2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Th is bonded in a distorted hexagonal planar geometry to six equivalent Ni atoms. All Th–Ni bond lengths are 2.90 Å. Mn is bonded in a 12-coordinate geometry to four equivalent Ni atoms. All Mn–Ni bond lengths are 2.53 Å. Ni is bonded in a 12-coordinate geometry to three equivalent Th and six equivalent Mn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BPb2O3F by Materials Project

Pb2BO3F crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.39 Å. Pb2+ is bonded in a 5-coordinate geometry to three O2- and two F1- atoms. There are a spread of Pb–O bond distances ranging from 2.30–2.48 Å. There are one shorter (2.56 Å) and one longer (2.85 Å) Pb–F bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one B3+ and two equivalent Pb2+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one B3+ and two equivalent Pb2+ atoms. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal non-coplanar geometry to three equivalent Pb2+ atoms. In the second F1- site, F1- is bonded in an octahedral geometry to six equivalent Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlCuPO4 by Materials Project

CuTlPO4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Cu2+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.94 Å) and two longer (1.99 Å) Cu–O bond length. Tl1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Tl–O bond distances ranging from 2.63–3.07 Å. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.52–1.60 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Cu2+, one Tl1+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu2+, one Tl1+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Cu2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Tl1+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BiBPbO4 by Materials Project

PbBiBO4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.38 Å) and two longer (1.40 Å) B–O bond length. Pb2+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.33–3.04 Å. Bi3+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing BiO6 pentagonal pyramids. There are a spread of Bi–O bond distances ranging from 2.22–2.57 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Pb2+ and two equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one B3+, two equivalent Pb2+, and two equivalent Bi3+ atoms. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one B3+, one Pb2+, and one Bi3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2C by Materials Project

Fe2C is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Fe2+ is bonded in a distorted trigonal planar geometry to three equivalent C4- atoms. There is two shorter (1.92 Å) and one longer (1.94 Å) Fe–C bond length. C4- is bonded to six equivalent Fe2+ atoms to form a mixture of corner and edge-sharing CFe6 octahedra. The corner-sharing octahedral tilt angles are 51°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlCuPSe3 by Materials Project

CuTlPSe3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Cu1+ is bonded in a trigonal planar geometry to one Tl1+ and three Se2- atoms. The Cu–Tl bond length is 3.35 Å. There are a spread of Cu–Se bond distances ranging from 2.34–2.38 Å. Tl1+ is bonded in a 9-coordinate geometry to one Cu1+ and eight Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.40–3.96 Å. P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of P–Se bond distances ranging from 2.21–2.25 Å. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted L-shaped geometry to one Cu1+, four equivalent Tl1+, and one P4+ atom. In the second Se2- site, Se2- is bonded in a distorted L-shaped geometry to one Cu1+, one Tl1+, and one P4+ atom. In the third Se2- site, Se2- is bonded in a distorted water-like geometry to one Cu1+, three equivalent Tl1+, and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U2W2C3 by Materials Project

U2W2C3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. U4+ is bonded in a pentagonal planar geometry to five C4- atoms. There are three shorter (2.44 Å) and two longer (2.49 Å) U–C bond lengths. W2+ is bonded to four C4- atoms to form a mixture of corner and edge-sharing WC4 trigonal pyramids. There are a spread of W–C bond distances ranging from 2.09–2.19 Å. There are two inequivalent C4- sites. In the first C4- site, C4- is bonded to three equivalent U4+ and three equivalent W2+ atoms to form CU3W3 octahedra that share corners with six equivalent CU4W2 octahedra, edges with six equivalent CU3W3 octahedra, and a faceface with one CU4W2 octahedra. The corner-sharing octahedra tilt angles range from 40–60°. In the second C4- site, C4- is bonded to four equivalent U4+ and two equivalent W2+ atoms to form CU4W2 octahedra that share corners with twelve equivalent CU3W3 octahedra, edges with two equivalent CU4W2 octahedra, and faces with two equivalent CU3W3 octahedra. The corner-sharing octahedra tilt angles range from 40–60°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pu2W2C3 by Materials Project

Pu2W2C3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Pu4+ is bonded in a pentagonal planar geometry to five C4- atoms. There are two shorter (2.38 Å) and three longer (2.41 Å) Pu–C bond lengths. W2+ is bonded to four C4- atoms to form a mixture of corner and edge-sharing WC4 trigonal pyramids. There are a spread of W–C bond distances ranging from 2.11–2.17 Å. There are two inequivalent C4- sites. In the first C4- site, C4- is bonded to four equivalent Pu4+ and two equivalent W2+ atoms to form CPu4W2 octahedra that share corners with twelve equivalent CPu3W3 octahedra, edges with two equivalent CPu4W2 octahedra, and faces with two equivalent CPu3W3 octahedra. The corner-sharing octahedra tilt angles range from 39–58°. In the second C4- site, C4- is bonded to three equivalent Pu4+ and three equivalent W2+ atoms to form CPu3W3 octahedra that share corners with six equivalent CPu4W2 octahedra, edges with six equivalent CPu3W3 octahedra, and a faceface with one CPu4W2 octahedra. The corner-sharing octahedra tilt angles range from 39–58°.

36 MATERIALS SCIENCE↗