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7 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Pb(NO3)2 by Materials Project

Pb(NO3)2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Pb2+ is bonded to twelve equivalent O2- atoms to form corner-sharing PbO12 cuboctahedra. There are six shorter (2.78 Å) and six longer (2.94 Å) Pb–O bond lengths. N5+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All N–O bond lengths are 1.27 Å. O2- is bonded in a single-bond geometry to two equivalent Pb2+ and one N5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on P2H16PbC6(NO3)2 by Materials Project

(C3PH8)2Pb(NO3)2 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional and consists of eight trimethylphosphine molecules and one Pb(NO3)2 framework. In the Pb(NO3)2 framework, Pb2+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.65–3.16 Å. N3- is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.26–1.29 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Pb2+ and one N3- atom. In the second O2- site, O2- is bonded in a single-bond geometry to one Pb2+ and one N3- atom. In the third O2- site, O2- is bonded in a single-bond geometry to one Pb2+ and one N3- atom.

36 MATERIALS SCIENCE↗
NASA NTRS1974

In situ mass analysis of particles by surface ionization mass spectrometry

A qualitative study of the application of surface ionization and mass spectrometry to the in situ detection and constituent analysis of atmospheric particles was conducted. The technique consists of mass analysis of ions formed as a result of impingement of a stream of particles on a hot filament where, it is presumed, surface ionization takes place. Laboratory air particles containing K, Ca, and possibly hydrocarbons were detected. Other known particles such as Al2O3, Pb(NO3)2, and Cr2O3 were analyzed by detecting the respective metal atoms making up the particles. In some cases, mass numbers indicative of compounds making up the particles were detected showing surface ionization of particles sometimes leads to chemical analysis as well as to elemental analysis. Individual particles were detected, and it was shown that the technique is sensitive to Al2O3 particles with a mass of a few nanograms.

Lassiter, W. S.↗
NASA NTRS1997

Optical and Atomic Force Microscopy Characterization of PbI2 Quantum Dots

Lead iodide (PbI2) clusters were synthesized from the chemical reaction of NaI (or KI) with Pb(NO3)2 in H2O, D2O, CH3OH, and C3H7OH media. The observation of the absorption features above 350 nm with the help of integrating sphere accessory strongly suggests the quantum dot formation of PbI2 in solution. Spectral comparison between the synthesized PbI2 clusters in solution and PbI2 nanophase by impregnation of PbI2 in four different pore-sized porous silica indicates that the PbI2 cluster size in solution is less than 2.5 nm in lateral dimension. Atomic force microscopy (AFM) measurements show that the PbL clusters deposited onto three different molecularly flat surfaces are single-layered. The measured height is 1.0 - 0.1 nm. The swollen layer thickness can be attributed to the intralayer contraction from the strong lateral interaction among PbI2 molecules, which is supported by ab initio calculation. Raman scattering measurement of LO and TO modes of PbI2 in bulk and in the confined state were also conducted in 50-150 cu cm region. The observed three bands at 74, %, 106 1/cm are assigned to TO2, LO2, and LO, mode, respectively. The relatively small red-shift in LO modes may be caused by the surface phonon polaritons of PbI2 nanophase in the porous silica.

Mu, R.↗
DOE OSTI2020

Materials Data on Hg4Pb2N6O19 by Materials Project

Hg4O(Pb(NO3)3)2 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional and consists of eight Hg4O clusters and one Pb(NO3)3 framework. In each Hg4O cluster, Hg2+ is bonded in a single-bond geometry to one O2- atom. The Hg–O bond length is 2.17 Å. O2- is bonded in a tetrahedral geometry to four equivalent Hg2+ atoms. In the Pb(NO3)3 framework, Pb4+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. All Pb–O bond lengths are 2.86 Å. N+3.67+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.27 Å) and one longer (1.28 Å) N–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one N+3.67+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to two equivalent Pb4+ and one N+3.67+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pb13(N2O13)2 by Materials Project

Pb13O14(NO3)4 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four nitric acid molecules and one Pb13O14 cluster. In the Pb13O14 cluster, there are seven inequivalent Pb+2.46+ sites. In the first Pb+2.46+ site, Pb+2.46+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Pb–O bond distances ranging from 2.25–2.40 Å. In the second Pb+2.46+ site, Pb+2.46+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Pb–O bond distances ranging from 2.25–2.40 Å. In the third Pb+2.46+ site, Pb+2.46+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Pb–O bond distances ranging from 2.25–2.40 Å. In the fourth Pb+2.46+ site, Pb+2.46+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.38–2.47 Å. In the fifth Pb+2.46+ site, Pb+2.46+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Pb–O bond distances ranging from 2.19–2.30 Å. In the sixth Pb+2.46+ site, Pb+2.46+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Pb–O bond distances ranging from 2.19–2.30 Å. In the seventh Pb+2.46+ site, Pb+2.46+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Pb–O bond distances ranging from 2.18–2.30 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Pb+2.46+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Pb+2.46+ atoms. In the third O2- site, O2- is bonded to four Pb+2.46+ atoms to form a mixture of corner and edge-sharing OPb4 tetrahedra. In the fourth O2- site, O2- is bonded to four Pb+2.46+ atoms to form a mixture of corner and edge-sharing OPb4 tetrahedra. In the fifth O2- site, O2- is bonded to four Pb+2.46+ atoms to form a mixture of corner and edge-sharing OPb4 tetrahedra. In the sixth O2- site, O2- is bonded to four Pb+2.46+ atoms to form a mixture of corner and edge-sharing OPb4 tetrahedra. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Pb+2.46+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu3Pb2Se2(NO7)2 by Materials Project

Cu3Pb2(SeO4)2(NO3)2 crystallizes in the orthorhombic Cmc2_1 space group. The structure is two-dimensional and consists of eight nitric acid molecules and two Cu3Pb2(SeO4)2 sheets oriented in the (0, 0, 1) direction. In each Cu3Pb2(SeO4)2 sheet, there are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.92–1.99 Å. In the second Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.95–1.97 Å. There are two inequivalent Pb4+ sites. In the first Pb4+ site, Pb4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Pb–O bond distances ranging from 2.42–2.54 Å. In the second Pb4+ site, Pb4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Pb–O bond distances ranging from 2.47–2.54 Å. There are two inequivalent Se2+ sites. In the first Se2+ site, Se2+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. All Se–O bond lengths are 1.74 Å. In the second Se2+ site, Se2+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. All Se–O bond lengths are 1.74 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to three Cu2+ and one Pb4+ atom to form distorted corner-sharing OCu3Pb tetrahedra. In the second O2- site, O2- is bonded to three Cu2+ and one Pb4+ atom to form distorted corner-sharing OCu3Pb tetrahedra. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cu2+, one Pb4+, and one Se2+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Cu2+, one Pb4+, and one Se2+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cu2+, one Pb4+, and one Se2+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Cu2+, one Pb4+, and one Se2+ atom.

36 MATERIALS SCIENCE↗