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.
XeF2 is Cyanogen Chloride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is zero-dimensional and consists of two XeF2 clusters. Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. F is bonded in a single-bond geometry to one Xe atom.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
XeF2Hg(XeF2)4(PF6)2 crystallizes in the orthorhombic Pccn space group. The structure is zero-dimensional and consists of four Hg(XeF2)4 clusters, eight PF6 clusters, and four XeF2 clusters. In each Hg(XeF2)4 cluster, there are two inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.04 Å) and one longer (2.13 Å) Xe–F bond lengths. In the second Xe site, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.04 Å) and one longer (2.15 Å) Xe–F bond lengths. Hg is bonded in a 4-coordinate geometry to four F atoms. There are two shorter (2.30 Å) and two longer (2.36 Å) Hg–F bond lengths. There are four inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Xe atom. In the second F site, F is bonded in a distorted bent 120 degrees geometry to one Xe and one Hg atom. In the third F site, F is bonded in a single-bond geometry to one Xe atom. In the fourth F site, F is bonded in a bent 150 degrees geometry to one Xe and one Hg atom. In each PF6 cluster, P is bonded in an octahedral geometry to six F atoms. There are a spread of P–F bond distances ranging from 1.63–1.67 Å. There are six inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one P atom. In the second F site, F is bonded in a single-bond geometry to one P atom. In the third F site, F is bonded in a single-bond geometry to one P atom. In the fourth F site, F is bonded in a single-bond geometry to one P atom. In the fifth F site, F is bonded in a single-bond geometry to one P atom. In the sixth F site, F is bonded in a single-bond geometry to one P atom. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. F is bonded in a single-bond geometry to one Xe atom.
Cu(XeF2)6(SbF6)2 is Fluorite structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of three Cu(XeF2)6 clusters and six SbF6 clusters. In each Cu(XeF2)6 cluster, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.03 Å) and one longer (2.17 Å) Xe–F bond lengths. Cu is bonded in an octahedral geometry to six equivalent F atoms. All Cu–F bond lengths are 2.02 Å. There are two inequivalent F sites. In the first F site, F is bonded in a bent 120 degrees geometry to one Xe and one Cu atom. In the second F site, F is bonded in a single-bond geometry to one Xe atom. In each SbF6 cluster, Sb is bonded in an octahedral geometry to six F atoms. There is three shorter (1.92 Å) and three longer (1.93 Å) Sb–F bond length. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a single-bond geometry to one Sb atom.
Zn(XeF2)6(SbF6)2 is Fluorite structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of six SbF6 clusters and three Zn(XeF2)6 clusters. In each SbF6 cluster, Sb is bonded in an octahedral geometry to six F atoms. There is three shorter (1.92 Å) and three longer (1.93 Å) Sb–F bond length. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a single-bond geometry to one Sb atom. In each Zn(XeF2)6 cluster, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.03 Å) and one longer (2.16 Å) Xe–F bond lengths. Zn is bonded in an octahedral geometry to six equivalent F atoms. All Zn–F bond lengths are 2.05 Å. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Xe atom. In the second F site, F is bonded in a bent 120 degrees geometry to one Xe and one Zn atom.
(XeF2)3(HgTe2(OF5)2)2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four HgTe2(OF5)2 clusters and six XeF2 clusters. In each HgTe2(OF5)2 cluster, Hg is bonded in a linear geometry to two O atoms. There are one shorter (2.06 Å) and one longer (2.07 Å) Hg–O bond lengths. There are two inequivalent Te sites. In the first Te site, Te is bonded in an octahedral geometry to one O and five F atoms. The Te–O bond length is 1.87 Å. There is two shorter (1.88 Å) and three longer (1.89 Å) Te–F bond length. In the second Te site, Te is bonded in an octahedral geometry to one O and five F atoms. The Te–O bond length is 1.88 Å. There are a spread of Te–F bond distances ranging from 1.87–1.89 Å. There are two inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Hg and one Te atom. In the second O site, O is bonded in a bent 120 degrees geometry to one Hg and one Te atom. There are ten inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Te atom. In the second F site, F is bonded in a single-bond geometry to one Te atom. In the third F site, F is bonded in a single-bond geometry to one Te atom. In the fourth F site, F is bonded in a single-bond geometry to one Te atom. In the fifth F site, F is bonded in a single-bond geometry to one Te atom. In the sixth F site, F is bonded in a single-bond geometry to one Te atom. In the seventh F site, F is bonded in a single-bond geometry to one Te atom. In the eighth F site, F is bonded in a single-bond geometry to one Te atom. In the ninth F site, F is bonded in a single-bond geometry to one Te atom. In the tenth F site, F is bonded in a single-bond geometry to one Te atom. In each XeF2 cluster, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.08 Å) and one longer (2.09 Å) Xe–F bond lengths. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Xe atom. In the second F site, F is bonded in a single-bond geometry to one Xe atom.
(XeF2)4(AsF6)2O2 crystallizes in the tetragonal I4/mcm space group. The structure is zero-dimensional and consists of four water molecules, four AsF6 clusters, and eight XeF2 clusters. In each AsF6 cluster, As is bonded in an octahedral geometry to six equivalent F atoms. All As–F bond lengths are 1.78 Å. F is bonded in a single-bond geometry to one As atom. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.09 Å. F is bonded in a single-bond geometry to one Xe atom.
XeF2IF5 is Heusler-derived structured and crystallizes in the tetragonal I4/m space group. The structure is zero-dimensional and consists of four IF5 clusters and four XeF2 clusters. In each IF5 cluster, I is bonded in a square pyramidal geometry to five F atoms. There is one shorter (1.87 Å) and four longer (1.93 Å) I–F bond length. There are two inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one I atom. In the second F site, F is bonded in a single-bond geometry to one I atom. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.09 Å. F is bonded in a single-bond geometry to one Xe atom.
BaSb2(XeF5)4XeF2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional and consists of two XeF2 clusters and one BaSb2(XeF5)4 framework. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. F is bonded in a single-bond geometry to one Xe atom. In the BaSb2(XeF5)4 framework, there are three inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the second Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the third Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. Ba is bonded to twelve F atoms to form BaF12 cuboctahedra that share corners with four equivalent SbF6 octahedra. The corner-sharing octahedral tilt angles are 22°. There are a spread of Ba–F bond distances ranging from 2.79–3.08 Å. Sb is bonded to six F atoms to form SbF6 octahedra that share corners with two equivalent BaF12 cuboctahedra. There is four shorter (1.92 Å) and two longer (1.93 Å) Sb–F bond length. There are five inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a distorted single-bond geometry to one Ba and one Sb atom. In the third F site, F is bonded in a bent 150 degrees geometry to one Xe and one Ba atom. In the fourth F site, F is bonded in a distorted single-bond geometry to one Xe and one Ba atom. In the fifth F site, F is bonded in a distorted single-bond geometry to one Xe and one Ba atom.
XeF2Pb3P6(Xe5F28)2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two XeF2 clusters and one Pb3P6(Xe5F28)2 sheet oriented in the (0, 0, 1) direction. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. F is bonded in a single-bond geometry to one Xe atom. In the Pb3P6(Xe5F28)2 sheet, there are three inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.08 Å) and one longer (2.10 Å) Xe–F bond lengths. In the second Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the third Xe site, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.08 Å) and one longer (2.09 Å) Xe–F bond lengths. There are two inequivalent Pb sites. In the first Pb site, Pb is bonded in a 9-coordinate geometry to nine F atoms. There are a spread of Pb–F bond distances ranging from 2.53–2.79 Å. In the second Pb site, Pb is bonded in a body-centered cubic geometry to eight F atoms. There are four shorter (2.52 Å) and four longer (2.57 Å) Pb–F bond lengths. There are three inequivalent P sites. In the first P site, P is bonded in an octahedral geometry to six F atoms. There are a spread of P–F bond distances ranging from 1.62–1.71 Å. In the second P site, P is bonded in an octahedral geometry to six F atoms. There are a spread of P–F bond distances ranging from 1.63–1.68 Å. In the third P site, P is bonded in an octahedral geometry to six F atoms. There are a spread of P–F bond distances ranging from 1.63–1.68 Å. There are nineteen inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one P atom. In the second F site, F is bonded in a distorted single-bond geometry to one Xe and one Pb atom. In the third F site, F is bonded in a linear geometry to one Xe and one Pb atom. In the fourth F site, F is bonded in a distorted bent 150 degrees geometry to one Xe and one Pb atom. In the fifth F site, F is bonded in a single-bond geometry to one P atom. In the sixth F site, F is bonded in a distorted single-bond geometry to one Pb and one P atom. In the seventh F site, F is bonded in a bent 150 degrees geometry to one Xe and one Pb atom. In the eighth F site, F is bonded in a single-bond geometry to one P atom. In the ninth F site, F is bonded in a bent 150 degrees geometry to one Xe and one Pb atom. In the tenth F site, F is bonded in a single-bond geometry to one P atom. In the eleventh F site, F is bonded in a single-bond geometry to one P atom. In the twelfth F site, F is bonded in a single-bond geometry to one P atom. In the thirteenth F site, F is bonded in a single-bond geometry to one P atom. In the fourteenth F site, F is bonded in a single-bond geometry to one P atom. In the fifteenth F site, F is bonded in a single-bond geometry to one Pb and one P atom. In the sixteenth F site, F is bonded in a single-bond geometry to one P atom. In the seventeenth F site, F is bonded in a single-bond geometry to one P atom. In the eighteenth F site, F is bonded in a single-bond geometry to one P atom. In the nineteenth F site, F is bonded in a single-bond geometry to one Pb and one P atom.
XeF2XeF4 is Copper structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of two XeF2 clusters and two XeF4 clusters. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. F is bonded in a single-bond geometry to one Xe atom. In each XeF4 cluster, Xe is bonded in a square co-planar geometry to four equivalent F atoms. All Xe–F bond lengths are 2.04 Å. F is bonded in a single-bond geometry to one Xe atom.
BaNb2(XeF5)4XeF2 crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional and consists of four XeF2 clusters and one BaNb2(XeF5)4 framework. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. F is bonded in a single-bond geometry to one Xe atom. In the BaNb2(XeF5)4 framework, there are two inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the second Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. Ba is bonded to twelve F atoms to form BaF12 cuboctahedra that share corners with four equivalent NbF6 octahedra. The corner-sharing octahedral tilt angles are 21°. There are a spread of Ba–F bond distances ranging from 2.83–3.10 Å. Nb is bonded to six F atoms to form NbF6 octahedra that share corners with two equivalent BaF12 cuboctahedra. There is four shorter (1.94 Å) and two longer (1.96 Å) Nb–F bond length. There are four inequivalent F sites. In the first F site, F is bonded in a bent 150 degrees geometry to one Xe and one Ba atom. In the second F site, F is bonded in a distorted single-bond geometry to one Xe and one Ba atom. In the third F site, F is bonded in a distorted single-bond geometry to one Ba and one Nb atom. In the fourth F site, F is bonded in a single-bond geometry to one Nb atom.
BaRu2(XeF5)4XeF2 crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional and consists of four XeF2 clusters and one BaRu2(XeF5)4 framework. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. F is bonded in a single-bond geometry to one Xe atom. In the BaRu2(XeF5)4 framework, there are two inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the second Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. Ba is bonded to twelve F atoms to form BaF12 cuboctahedra that share corners with four equivalent RuF6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are a spread of Ba–F bond distances ranging from 2.77–3.03 Å. Ru is bonded to six F atoms to form RuF6 octahedra that share corners with two equivalent BaF12 cuboctahedra. There is four shorter (1.89 Å) and two longer (1.90 Å) Ru–F bond length. There are four inequivalent F sites. In the first F site, F is bonded in a distorted bent 150 degrees geometry to one Xe and one Ba atom. In the second F site, F is bonded in a bent 150 degrees geometry to one Xe and one Ba atom. In the third F site, F is bonded in a distorted single-bond geometry to one Ba and one Ru atom. In the fourth F site, F is bonded in a single-bond geometry to one Ru atom.
BaAs2(XeF5)4XeF2 crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional and consists of four XeF2 clusters and one BaAs2(XeF5)4 framework. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. F is bonded in a single-bond geometry to one Xe atom. In the BaAs2(XeF5)4 framework, there are two inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the second Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. Ba is bonded to twelve F atoms to form BaF12 cuboctahedra that share corners with four equivalent AsF6 octahedra. The corner-sharing octahedral tilt angles are 22°. There are a spread of Ba–F bond distances ranging from 2.78–3.07 Å. As is bonded to six F atoms to form AsF6 octahedra that share corners with two equivalent BaF12 cuboctahedra. There is four shorter (1.78 Å) and two longer (1.79 Å) As–F bond length. There are four inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Ba and one As atom. In the second F site, F is bonded in a distorted single-bond geometry to one Xe and one Ba atom. In the third F site, F is bonded in a bent 150 degrees geometry to one Xe and one Ba atom. In the fourth F site, F is bonded in a single-bond geometry to one As atom.
XeF2Sb2F11 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two Sb2F11 clusters and two XeF2 clusters. In each Sb2F11 cluster, there are two inequivalent Sb sites. In the first Sb site, Sb is bonded to six F atoms to form corner-sharing SbF6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are a spread of Sb–F bond distances ranging from 1.90–2.08 Å. In the second Sb site, Sb is bonded to six F atoms to form corner-sharing SbF6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are a spread of Sb–F bond distances ranging from 1.90–2.06 Å. There are eleven inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a single-bond geometry to one Sb atom. In the third F site, F is bonded in a single-bond geometry to one Sb atom. In the fourth F site, F is bonded in a single-bond geometry to one Sb atom. In the fifth F site, F is bonded in a single-bond geometry to one Sb atom. In the sixth F site, F is bonded in a linear geometry to two Sb atoms. In the seventh F site, F is bonded in a single-bond geometry to one Sb atom. In the eighth F site, F is bonded in a single-bond geometry to one Sb atom. In the ninth F site, F is bonded in a single-bond geometry to one Sb atom. In the tenth F site, F is bonded in a single-bond geometry to one Sb atom. In the eleventh F site, F is bonded in a single-bond geometry to one Sb atom. In each XeF2 cluster, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.03 Å. F is bonded in a single-bond geometry to one Xe atom.
Focused electron beam induced etching (FEBIE) with XeF 2 (xenon difluoride) precursor is conducted on multi-layer exfoliated WS 2 (tungsten disulfide) and monolayer WS 2 grown by chemical vapor deposition (CVD). The films are characterized by atomic force microscopy (AFM) and Raman and photoluminescence (PL) spectroscopy post-etching. The etch rates/efficiencies are reported as a function of electron beam energy, current, dwell time, and XeF 2 pressure. Bulk film Raman spectra are unchanged post-FEBIE, indicating minimal subsurface damage. Monolayer WS 2 shows a decrease in Raman and PL intensity post-FEBIE, with a dose-to-clear of ≈2 nC µm −2 . The study reveals regimes affected by the various mass transport contributions such as refresh time and the ratio of electrons/XeF 2 . Spontaneous etching was discovered during FEBIE of large patterned areas due to the long frame/refresh times. Density functional theory and ab initio molecular dynamics simulations compares desorption of SF x and WF x molecules from pristine WS 2 basal planes and pore edges, revealing the spontaneous etching is consistent with etching of partially etched monolayers during each frame. Single-line etching width of 21 nm, and patterning flakes into 100 nm wide channels are demonstrated. In conclusion, this work demonstrates the possibility of editing WS 2 flakes into electronic devices of arbitrary dimensions for semiconductor applications.