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At least 685 records · Page 38
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on LaPmMg2 by Materials Project

Mg2PmLa is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to four equivalent Pm and four equivalent La atoms. All Mg–Pm bond lengths are 3.38 Å. All Mg–La bond lengths are 3.38 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Mg atoms. La is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3Pm by Materials Project

Sr3Pm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr is bonded to eight equivalent Sr and four equivalent Pm atoms to form distorted SrSr8Pm4 cuboctahedra that share corners with four equivalent PmSr12 cuboctahedra, corners with fourteen equivalent SrSr8Pm4 cuboctahedra, edges with six equivalent PmSr12 cuboctahedra, edges with twelve equivalent SrSr8Pm4 cuboctahedra, faces with four equivalent PmSr12 cuboctahedra, and faces with sixteen equivalent SrSr8Pm4 cuboctahedra. There are a spread of Sr–Sr bond distances ranging from 3.97–4.21 Å. There are two shorter (4.00 Å) and two longer (4.09 Å) Sr–Pm bond lengths. Pm is bonded to twelve equivalent Sr atoms to form PmSr12 cuboctahedra that share corners with six equivalent PmSr12 cuboctahedra, corners with twelve equivalent SrSr8Pm4 cuboctahedra, edges with eighteen equivalent SrSr8Pm4 cuboctahedra, faces with eight equivalent PmSr12 cuboctahedra, and faces with twelve equivalent SrSr8Pm4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CePmMg2 by Materials Project

Mg2PmCe is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to four equivalent Pm and four equivalent Ce atoms. All Mg–Pm bond lengths are 3.35 Å. All Mg–Ce bond lengths are 3.35 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Mg atoms. Ce is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiPmGa2 by Materials Project

LiPmGa2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Li is bonded in a body-centered cubic geometry to eight equivalent Ga atoms. All Li–Ga bond lengths are 3.01 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Ga atoms. All Pm–Ga bond lengths are 3.01 Å. Ga is bonded in a body-centered cubic geometry to four equivalent Li and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmBr2 by Materials Project

PmBr2 is trigonal omega-like structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Pm is bonded to six equivalent Br atoms to form a mixture of edge and corner-sharing PmBr6 octahedra. The corner-sharing octahedral tilt angles are 39°. All Pm–Br bond lengths are 2.98 Å. Br is bonded in a 3-coordinate geometry to three equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmTmZn2 by Materials Project

TmPmZn2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Tm is bonded in a body-centered cubic geometry to eight equivalent Zn atoms. All Tm–Zn bond lengths are 3.11 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Zn atoms. All Pm–Zn bond lengths are 3.11 Å. Zn is bonded in a body-centered cubic geometry to four equivalent Tm and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmNdIn2 by Materials Project

PmNdIn2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Pm is bonded in a body-centered cubic geometry to eight equivalent In atoms. All Pm–In bond lengths are 3.35 Å. Nd is bonded in a body-centered cubic geometry to eight equivalent In atoms. All Nd–In bond lengths are 3.35 Å. In is bonded in a body-centered cubic geometry to four equivalent Pm and four equivalent Nd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmGdCu2 by Materials Project

GdPmCu2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Gd is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. All Gd–Cu bond lengths are 3.10 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. All Pm–Cu bond lengths are 3.10 Å. Cu is bonded in a body-centered cubic geometry to four equivalent Gd and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YbPmCu2 by Materials Project

YbPmCu2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Yb is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. All Yb–Cu bond lengths are 3.03 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. All Pm–Cu bond lengths are 3.03 Å. Cu is bonded in a body-centered cubic geometry to four equivalent Yb and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmSmAl2 by Materials Project

SmPmAl2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sm is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Sm–Al bond lengths are 3.19 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Pm–Al bond lengths are 3.19 Å. Al is bonded in a body-centered cubic geometry to four equivalent Sm and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmErAl2 by Materials Project

ErPmAl2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Er is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Er–Al bond lengths are 3.14 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Pm–Al bond lengths are 3.14 Å. Al is bonded in a body-centered cubic geometry to four equivalent Er and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmBi3 by Materials Project

PmBi3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pm is bonded to twelve equivalent Bi atoms to form a mixture of face and corner-sharing PmBi12 cuboctahedra. There are six shorter (3.42 Å) and six longer (3.64 Å) Pm–Bi bond lengths. Bi is bonded in a 4-coordinate geometry to four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmErTl2 by Materials Project

ErPmTl2 is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Er is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Er–Tl bond lengths are 3.32 Å. Pm is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Pm–Tl bond lengths are 3.32 Å. Tl is bonded in a body-centered cubic geometry to four equivalent Er and four equivalent Pm atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmAg3 by Materials Project

PmAg3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pm is bonded to twelve equivalent Ag atoms to form a mixture of face and corner-sharing PmAg12 cuboctahedra. There are six shorter (3.18 Å) and six longer (3.27 Å) Pm–Ag bond lengths. Ag is bonded in a 4-coordinate geometry to four equivalent Pm and six equivalent Ag atoms. All Ag–Ag bond lengths are 2.98 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PmEu3 by Materials Project

Eu3Pm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded to eight equivalent Eu and four equivalent Pm atoms to form EuPm4Eu8 cuboctahedra that share corners with four equivalent PmEu12 cuboctahedra, corners with fourteen equivalent EuPm4Eu8 cuboctahedra, edges with six equivalent PmEu12 cuboctahedra, edges with twelve equivalent EuPm4Eu8 cuboctahedra, faces with four equivalent PmEu12 cuboctahedra, and faces with sixteen equivalent EuPm4Eu8 cuboctahedra. There are a spread of Eu–Eu bond distances ranging from 3.75–3.89 Å. There are two shorter (3.77 Å) and two longer (3.82 Å) Eu–Pm bond lengths. Pm is bonded to twelve equivalent Eu atoms to form PmEu12 cuboctahedra that share corners with six equivalent PmEu12 cuboctahedra, corners with twelve equivalent EuPm4Eu8 cuboctahedra, edges with eighteen equivalent EuPm4Eu8 cuboctahedra, faces with eight equivalent PmEu12 cuboctahedra, and faces with twelve equivalent EuPm4Eu8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2023

MgSiP 2 : An Infrared Nonlinear Optical Crystal with a Large Non‐Resonant Phase‐Matchable Second Harmonic Coefficient and High Laser Damage Threshold

Superior infrared nonlinear optical (NLO) crystals are in urgent demand in the development of lasers and optical technologies for communications and computing. The critical challenge is to find a crystal with large non‐resonant phase‐matchable NLO coefficients and high laser damage threshold (LDTs) simultaneously, which however scale inversely. This work reports such a material, MgSiP 2, that exhibits a large second harmonic generation (SHG) coefficient of d 14 ≈ d 36 = 89 ± 5 pm V −1 at 1550 nm fundamental wavelength, surpassing the commercial NLO crystals AgGaS 2 , AgGaSe 2 , and ZnGeP 2 . First principles theory reveals the polarizability and geometric arrangement of the [SiP 4 ] tetrahedral units as the origin of this large nonlinear response. Remarkably, it also exhibits a high LDT value of 684 GW cm −2 , which is six times larger than ZnGeP 2 and three times larger than CdSiP 2 . It has a wide transparency window of 0.53–10.35 µm, allowing broadband tunability. Further, it is Type I and Type II phase‐matchable with large effective SHG coefficients of d eff,I ≈80.2 pm V −1 and d eff,II ≈73.4 pm V −1 . The outstanding properties of MgSiP 2 make it a highly attractive candidate for optical frequency conversion in the infrared.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Tailored Frequency Conversion in Nonlinear Subwavelength Grating Metaslabs

The use of metaslab waveguides consisting of subwavelength gratings (SWGs) is proposed as a highly flexible approach to obtain phase‐matched frequency conversion in nonlinear integrated devices. Control over the phase matching (PM) condition is achieved through modification of the linear modal propagation constants by the SWG. The method is experimentally demonstrated by fabrication of 0.4 mm‐long GaAs metaslabs designed for second harmonic generation of near‐infrared light. A controlled spectral shift of up to 100 nm in the PM condition, relative to a uniform slab is observed. Excellent agreement is found between the experimental results and finite‐difference eigenmode simulations, which predict a tunable frequency conversion bandwidth of ∼300 nm for the design parameters. The different regimes of PM control supported by the structure are discussed. This work highlights the potential of SWGs as building blocks for tailored frequency conversion in nonlinear integrated devices.

Form birefringence↗
DOE OSTI2024

Measurement of the Z boson production cross-section in pp collisions at $ \sqrt{s}$ = 5.02 TeV

The first measurement of the Z boson production cross-section at centre-of-mass energy $\sqrt{s}$ = 5.02 TeV in the forward region is reported, using pp collision data collected by the LHCb experiment in year 2017, corresponding to an integrated luminosity of 100 ± 2 pb –1 . The production cross-section is measured for final-state muons in the pseudorapidity range 2.0 < η < 4.5 with transverse momentum p T > 20 GeV/c. The integrated cross-section is determined to be ${\sigma}_{Z\to \mu +\mu -}=39.6\pm 0.7\left(\textrm{stat}\right)\pm 0.6\left(\textrm{syst}\right)\pm 0.8\left(\textrm{lumi}\right)\textrm{pb}$ for the di-muon invariant mass in the range 60 < M μμ < 120 GeV/c 2 . This result and the differential cross-section results are in good agreement with theoretical predictions at next-to-next-to-leading order in the strong coupling constant. Based on a previous LHCb measurement of the Z boson production cross-section in pPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV, the nuclear modification factor RpPb is measured for the first time at this energy. The measured values are ${1.2}_{-0.3}^{+0.5}$ (stat) ± 0.1(syst) in the forward region (1.53 < ${y}_{\mu}^{\ast }$ < 4.03) and ${3.6}_{-0.9}^{+1.6}$ (stat) ± 0.2(syst) in the backward region (–4.97 < ${y}_{\mu}^{\ast }$ < –2.47), where ${y}_{\mu}^{\ast }$ represents the muon rapidity in the centre-of-mass frame.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗