SEARCH · Engineering Papers
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.
LuCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Lu3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Lu–B bond lengths are 2.85 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.08 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Lu3+ and six equivalent Co1+ atoms.
DyCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Dy3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Dy–B bond lengths are 2.88 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.09 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Dy3+ and six equivalent Co1+ atoms.
GdCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Gd3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Gd–B bond lengths are 2.90 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.09 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Gd3+ and six equivalent Co1+ atoms.
TbCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Tb3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Tb–B bond lengths are 2.89 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.09 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Tb3+ and six equivalent Co1+ atoms.
YCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Y3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Y–B bond lengths are 2.90 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.09 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Y3+ and six equivalent Co1+ atoms.
HoCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ho3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Ho–B bond lengths are 2.88 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.09 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Ho3+ and six equivalent Co1+ atoms.
ErCo3B2 crystallizes in the hexagonal P6/mmm 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 2.87 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.09 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Er3+ and six equivalent Co1+ atoms.
SmCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sm3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Sm–B bond lengths are 2.92 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.10 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Sm3+ and six equivalent Co1+ atoms.
TmCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Tm3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Tm–B bond lengths are 2.86 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.08 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Tm3+ and six equivalent Co1+ atoms.
LiAg2F6 crystallizes in the trigonal P321 space group. The structure is three-dimensional. Li1+ is bonded in a trigonal planar geometry to three equivalent F1- atoms. All Li–F bond lengths are 1.88 Å. Ag+2.50+ is bonded to six F1- atoms to form corner-sharing AgF6 octahedra. The corner-sharing octahedra tilt angles range from 44–46°. There are three shorter (2.12 Å) and three longer (2.18 Å) Ag–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted trigonal planar geometry to one Li1+ and two equivalent Ag+2.50+ atoms. In the second F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two equivalent Ag+2.50+ atoms.
ZrCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Zr2+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Zr–B bond lengths are 2.81 Å. Co+1.33+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.07 Å. B3- is bonded in a 9-coordinate geometry to three equivalent Zr2+ and six equivalent Co+1.33+ atoms.
CeCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ce3+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Ce–B bond lengths are 2.91 Å. Co1+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.10 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Ce3+ and six equivalent Co1+ atoms.
ScCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Sc2+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Sc–B bond lengths are 2.82 Å. Co+1.33+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Co–B bond lengths are 2.05 Å. B3- is bonded in a 6-coordinate geometry to three equivalent Sc2+ and six equivalent Co+1.33+ atoms.
CeIrAlH2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ce is bonded in a hexagonal planar geometry to six equivalent H atoms. All Ce–H bond lengths are 2.55 Å. Ir is bonded to three equivalent Al and two equivalent H atoms to form corner-sharing IrAl3H2 trigonal bipyramids. All Ir–Al bond lengths are 2.52 Å. Both Ir–H bond lengths are 1.70 Å. Al is bonded in a trigonal planar geometry to three equivalent Ir atoms. H is bonded to three equivalent Ce and one Ir atom to form a mixture of edge and corner-sharing HCe3Ir trigonal pyramids.
Zr5Te4 is Titanium telluride structured and crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a distorted square co-planar geometry to four equivalent Te atoms. All Zr–Te bond lengths are 3.11 Å. In the second Zr site, Zr is bonded to five equivalent Te atoms to form a mixture of distorted edge and corner-sharing ZrTe5 trigonal bipyramids. There are two shorter (2.94 Å) and three longer (2.95 Å) Zr–Te bond lengths. Te is bonded in a distorted hexagonal planar geometry to six Zr atoms.
BeGe3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Be is bonded in a distorted square co-planar geometry to twelve Ge atoms. There are four shorter (2.78 Å) and eight longer (2.95 Å) Be–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four equivalent Be and eight Ge atoms to form a mixture of distorted face, edge, and corner-sharing GeBe4Ge8 cuboctahedra. There are four shorter (2.78 Å) and four longer (2.95 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded in a distorted square co-planar geometry to four equivalent Be and eight equivalent Ge atoms.
Cu2Se crystallizes in the tetragonal P4_32_12 space group. The structure is three-dimensional. Cu1+ is bonded in a trigonal planar geometry to three equivalent Se2- atoms. There are one shorter (2.41 Å) and two longer (2.42 Å) Cu–Se bond lengths. Se2- is bonded to six equivalent Cu1+ atoms to form distorted corner-sharing SeCu6 pentagonal pyramids.
A bstract There is a remarkable connection between the boundary structure of the positive kinematic region and branch points of integrated amplitudes in planar $$ \mathcal{N} $$ N = 4 SYM. A long-standing question has been precisely how algebraic branch points emerge from this picture. We use wall crossing and scattering diagrams to systematically study the boundary structure of the positive kinematic regions associated with MHV amplitudes. The notion of asymptotic chambers in the scattering diagram naturally explains the appearance of algebraic branch points. Furthermore, the scattering diagram construction also motivates a new coordinate system for kinematic space that rationalizes the relations between algebraic letters in the symbol alphabet. As a direct application, we conjecture a complete list of all algebraic letters that could appear in the symbol alphabet of the 8-point MHV amplitude.