Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Boride”

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 127 records · Page 7
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Crystal growth and magnetic structure of ternary silicide Eu Pd 3 Si 2

The hexagonal CaCu 5 –type structure (P6/mmm) is the prototype for more than 100 ternary borides, gallides, and silicides, with general stoichiometry of RTM 3 X 2 (R=lanthanide/alkaline earth; TM=transition metal; X=B, Ga, Si, Ge). Here we report the synthesis, crystal structure, and bulk magnetic properties of polycrystalline and single crystal samples of EuPd 3 Si 2 and its nonmagnetic analog SrPd 3 Si 2 . Both compounds crystallize in the orthorhombic space group symmetry Imma (no. 74, Z = 2, oI12) displaying pseudohexagonal symmetry. Ferromagnetic (FM) order of Eu 2+ at T C1 =78K and a spin-reorientation transition at T C2 =5K appear as distinctive features in bulk magnetization, specific heat, and resistivity/resistance measurements. Neutron powder diffraction measurements on EuPd 3 Si 2 confirm FM order of the Eu 2+ spins below T C1 , with the spins aligned along the a axis below T C2 . Electronic band structure calculations corroborate the crystal structure and the FM state for EuPd 3 Si 2 , with a Pd d–band polarization in the same direction as the Eu 4f polarization, enhancing the observed spin moment.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Tribology and Tribocorrosion of Case-Hardened Steels: A Review

This report reviews the tribological and tribocorrosion performance of steels that are case-hardened via boriding, chromizing, carburizing, nitriding, nitrocarburizing, and carbonitriding. Case-hardening is commonly used to improve the hardness, impact durability, wear resistance, and corrosion resistance of steel alloys and has been successfully applied in various industries, providing a cost-effective, high-throughput solution for applications involving contact and sliding interfaces in complex service environments. This article summarizes the literature results of the wear and friction behavior of common case-hardening methods for steel alloys under various conditions, including corrosive environments. Special attention is given to the influences of case-hardening process parameters and alloy composition on tribological performance. Furthermore, by discussing key findings from the literature, this review provides insights into optimizing case-hardening processes for improving the tribological and tribocorrosion performance of steel alloys.

Alloys↗
DOE OSTI2020

Materials Data on KHg by Materials Project

KHg is delta Molybdenum Boride-like structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 7-coordinate geometry to eight Hg atoms. There are a spread of K–Hg bond distances ranging from 3.61–4.08 Å. In the second K site, K is bonded in a 7-coordinate geometry to seven Hg atoms. There are a spread of K–Hg bond distances ranging from 3.65–3.94 Å. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 9-coordinate geometry to seven K and two equivalent Hg atoms. There are one shorter (3.08 Å) and one longer (3.11 Å) Hg–Hg bond lengths. In the second Hg site, Hg is bonded in a 10-coordinate geometry to eight K and two equivalent Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3Pd4 by Materials Project

Zr3Pd4 is delta Molybdenum Boride-like structured and crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Zr is bonded in a 9-coordinate geometry to nine Pd atoms. There are a spread of Zr–Pd bond distances ranging from 2.73–3.09 Å. There are three inequivalent Pd sites. In the first Pd site, Pd is bonded in a 8-coordinate geometry to six equivalent Zr atoms. In the second Pd site, Pd is bonded in a 6-coordinate geometry to six equivalent Zr atoms. In the third Pd site, Pd is bonded in a 7-coordinate geometry to seven equivalent Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrSi by Materials Project

SrSi is delta Molybdenum Boride-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sr is bonded in a 7-coordinate geometry to seven equivalent Si atoms. There are a spread of Sr–Si bond distances ranging from 3.26–3.40 Å. Si is bonded in a 9-coordinate geometry to seven equivalent Sr and two equivalent Si atoms. Both Si–Si bond lengths are 2.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca7Ge6 by Materials Project

Ca7Ge6 is delta Molybdenum Boride-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Ca sites. In the first Ca site, Ca is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Ca–Ge bond distances ranging from 2.99–3.17 Å. In the second Ca site, Ca is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of Ca–Ge bond distances ranging from 3.16–3.50 Å. In the third Ca site, Ca is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of Ca–Ge bond distances ranging from 3.08–3.37 Å. In the fourth Ca site, Ca is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Ca–Ge bond distances ranging from 2.96–3.47 Å. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to eight Ca and one Ge atom. The Ge–Ge bond length is 2.59 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to eight Ca and one Ge atom. The Ge–Ge bond length is 2.55 Å. In the third Ge site, Ge is bonded in a 9-coordinate geometry to eight Ca and one Ge atom. In the fourth Ge site, Ge is bonded in a 9-coordinate geometry to seven Ca and two Ge atoms. The Ge–Ge bond length is 2.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BMo by Materials Project

MoB is delta Molybdenum Boride structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Mo3+ is bonded in a 7-coordinate geometry to seven equivalent B3- atoms. There are a spread of Mo–B bond distances ranging from 2.33–2.52 Å. B3- is bonded in a 9-coordinate geometry to seven equivalent Mo3+ and two equivalent B3- atoms. Both B–B bond lengths are 1.88 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErGePd2 by Materials Project

ErPd2Ge is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Er is bonded in a 11-coordinate geometry to eight equivalent Pd and three equivalent Ge atoms. There are a spread of Er–Pd bond distances ranging from 3.04–3.16 Å. There are a spread of Er–Ge bond distances ranging from 2.98–3.04 Å. Pd is bonded in a 12-coordinate geometry to four equivalent Er and three equivalent Ge atoms. There are a spread of Pd–Ge bond distances ranging from 2.53–2.66 Å. Ge is bonded in a 9-coordinate geometry to three equivalent Er and six equivalent Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3(NbGe2)2 by Materials Project

Hf3(NbGe2)2 is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of Hf–Ge bond distances ranging from 2.80–3.01 Å. In the second Hf site, Hf is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Hf–Ge bond distances ranging from 2.71–2.83 Å. Nb is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Nb–Ge bond distances ranging from 2.59–2.80 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four Hf, four equivalent Nb, and one Ge atom. The Ge–Ge bond length is 2.58 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to five Hf, three equivalent Nb, and one Ge atom. The Ge–Ge bond length is 2.78 Å. In the third Ge site, Ge is bonded in a 9-coordinate geometry to six Hf, two equivalent Nb, and one Ge atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YNiSn2 by Materials Project

YNiSn2 is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are three inequivalent Y sites. In the first Y site, Y is bonded in a 8-coordinate geometry to six Ni and eight Sn atoms. There are a spread of Y–Ni bond distances ranging from 3.27–3.46 Å. There are a spread of Y–Sn bond distances ranging from 3.12–3.20 Å. In the second Y site, Y is bonded in a 11-coordinate geometry to two equivalent Ni and nine Sn atoms. Both Y–Ni bond lengths are 3.11 Å. There are a spread of Y–Sn bond distances ranging from 3.16–3.52 Å. In the third Y site, Y is bonded in a 1-coordinate geometry to four Ni and nine Sn atoms. There are two shorter (3.17 Å) and two longer (3.28 Å) Y–Ni bond lengths. There are a spread of Y–Sn bond distances ranging from 3.17–3.58 Å. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded in a 10-coordinate geometry to five Y and five Sn atoms. There are a spread of Ni–Sn bond distances ranging from 2.53–2.75 Å. In the second Ni site, Ni is bonded in a 7-coordinate geometry to three Y and five Sn atoms. There are a spread of Ni–Sn bond distances ranging from 2.50–2.77 Å. In the third Ni site, Ni is bonded in a 10-coordinate geometry to four Y and five Sn atoms. There are a spread of Ni–Sn bond distances ranging from 2.53–2.66 Å. There are six inequivalent Sn sites. In the first Sn site, Sn is bonded in a 8-coordinate geometry to four Y, three equivalent Ni, and one Sn atom. The Sn–Sn bond length is 3.01 Å. In the second Sn site, Sn is bonded in a 9-coordinate geometry to six Y and three Ni atoms. In the third Sn site, Sn is bonded in a 6-coordinate geometry to four Y and two Ni atoms. In the fourth Sn site, Sn is bonded in a 6-coordinate geometry to four Y and three Ni atoms. In the fifth Sn site, Sn is bonded in a 8-coordinate geometry to four Y, three Ni, and one Sn atom. In the sixth Sn site, Sn is bonded in a 2-coordinate geometry to four Y and one Ni atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfSiMo by Materials Project

MoSiHf is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Hf is bonded in a 9-coordinate geometry to four equivalent Mo and five equivalent Si atoms. There are two shorter (2.97 Å) and two longer (3.08 Å) Hf–Mo bond lengths. There are a spread of Hf–Si bond distances ranging from 2.74–2.91 Å. Mo is bonded in a 12-coordinate geometry to four equivalent Hf and four equivalent Si atoms. There are a spread of Mo–Si bond distances ranging from 2.52–2.69 Å. Si is bonded in a 9-coordinate geometry to five equivalent Hf and four equivalent Mo atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrAl by Materials Project

AlSr is delta Molybdenum Boride-like structured and crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are four inequivalent Sr sites. In the first Sr site, Sr is bonded in a 7-coordinate geometry to seven Al atoms. There are a spread of Sr–Al bond distances ranging from 3.36–3.61 Å. In the second Sr site, Sr is bonded in a 1-coordinate geometry to seven Al atoms. There are a spread of Sr–Al bond distances ranging from 3.11–3.64 Å. In the third Sr site, Sr is bonded in a 6-coordinate geometry to six Al atoms. There are three shorter (3.43 Å) and three longer (3.44 Å) Sr–Al bond lengths. In the fourth Sr site, Sr is bonded in a 6-coordinate geometry to six Al atoms. There are a spread of Sr–Al bond distances ranging from 3.31–3.74 Å. There are four inequivalent Al sites. In the first Al site, Al is bonded in a 7-coordinate geometry to seven Sr atoms. In the second Al site, Al is bonded in a 9-coordinate geometry to six Sr and three equivalent Al atoms. All Al–Al bond lengths are 2.71 Å. In the third Al site, Al is bonded in a 9-coordinate geometry to seven Sr and two equivalent Al atoms. Both Al–Al bond lengths are 2.85 Å. In the fourth Al site, Al is bonded in a 9-coordinate geometry to six Sr and three Al atoms. Both Al–Al bond lengths are 2.73 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrC20 by Materials Project

SrC20 is Iron Boride-like structured and crystallizes in the cubic Pm-3 space group. The structure is three-dimensional. Sr2+ is bonded in a 2-coordinate geometry to ten C+0.10- atoms. There are a spread of Sr–C bond distances ranging from 3.01–3.16 Å. There are six inequivalent C+0.10- sites. In the first C+0.10- site, C+0.10- is bonded in a 4-coordinate geometry to one Sr2+ and three C+0.10- atoms. There is one shorter (1.43 Å) and two longer (1.45 Å) C–C bond length. In the second C+0.10- site, C+0.10- is bonded in a trigonal planar geometry to three C+0.10- atoms. There is one shorter (1.43 Å) and two longer (1.44 Å) C–C bond length. In the third C+0.10- site, C+0.10- is bonded in a distorted trigonal planar geometry to three C+0.10- atoms. There are a spread of C–C bond distances ranging from 1.42–1.45 Å. In the fourth C+0.10- site, C+0.10- is bonded in a 3-coordinate geometry to one Sr2+ and three C+0.10- atoms. There is one shorter (1.42 Å) and two longer (1.45 Å) C–C bond length. In the fifth C+0.10- site, C+0.10- is bonded in a distorted trigonal planar geometry to one Sr2+ and three C+0.10- atoms. In the sixth C+0.10- site, C+0.10- is bonded in a distorted trigonal planar geometry to three C+0.10- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaC20 by Materials Project

BaC20 is Iron Boride-like structured and crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. Ba2+ is bonded in a 12-coordinate geometry to twelve C+0.10- atoms. There are four shorter (3.11 Å) and eight longer (3.27 Å) Ba–C bond lengths. There are three inequivalent C+0.10- sites. In the first C+0.10- site, C+0.10- is bonded in a distorted trigonal planar geometry to three C+0.10- atoms. There are a spread of C–C bond distances ranging from 1.42–1.45 Å. In the second C+0.10- site, C+0.10- is bonded in a 4-coordinate geometry to one Ba2+ and three C+0.10- atoms. There is one shorter (1.43 Å) and two longer (1.45 Å) C–C bond length. In the third C+0.10- site, C+0.10- is bonded in a distorted trigonal planar geometry to one Ba2+ and three C+0.10- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr2CoP by Materials Project

Zr2CoP is delta Molybdenum Boride-derived structured and crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 7-coordinate geometry to four equivalent Co and three equivalent P atoms. There are a spread of Zr–Co bond distances ranging from 2.65–2.86 Å. There are two shorter (2.76 Å) and one longer (2.81 Å) Zr–P bond lengths. In the second Zr site, Zr is bonded in a 7-coordinate geometry to three equivalent Co and four equivalent P atoms. There are two shorter (2.69 Å) and one longer (2.88 Å) Zr–Co bond lengths. There are a spread of Zr–P bond distances ranging from 2.74–2.80 Å. Co is bonded in a 9-coordinate geometry to seven Zr and two equivalent P atoms. Both Co–P bond lengths are 2.32 Å. P is bonded in a 9-coordinate geometry to seven Zr and two equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr2NiP by Materials Project

Zr2NiP is delta Molybdenum Boride-derived structured and crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 7-coordinate geometry to three equivalent Ni and four equivalent P atoms. There are two shorter (2.73 Å) and one longer (2.88 Å) Zr–Ni bond lengths. There are a spread of Zr–P bond distances ranging from 2.72–2.84 Å. In the second Zr site, Zr is bonded in a 7-coordinate geometry to four equivalent Ni and three equivalent P atoms. There are a spread of Zr–Ni bond distances ranging from 2.69–2.83 Å. There are two shorter (2.74 Å) and one longer (2.85 Å) Zr–P bond lengths. Ni is bonded in a 9-coordinate geometry to seven Zr and two equivalent P atoms. Both Ni–P bond lengths are 2.31 Å. P is bonded in a 9-coordinate geometry to seven Zr and two equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2CoP by Materials Project

Hf2CoP is delta Molybdenum Boride-derived structured and crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 7-coordinate geometry to four equivalent Co and three equivalent P atoms. There are a spread of Hf–Co bond distances ranging from 2.63–2.86 Å. There are two shorter (2.73 Å) and one longer (2.80 Å) Hf–P bond lengths. In the second Hf site, Hf is bonded in a 7-coordinate geometry to three equivalent Co and four equivalent P atoms. There are two shorter (2.65 Å) and one longer (2.85 Å) Hf–Co bond lengths. There are three shorter (2.71 Å) and one longer (2.78 Å) Hf–P bond lengths. Co is bonded in a 9-coordinate geometry to seven Hf and two equivalent P atoms. Both Co–P bond lengths are 2.31 Å. P is bonded in a 9-coordinate geometry to seven Hf and two equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrGa by Materials Project

ZrGa is delta Molybdenum Boride structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Zr is bonded in a 7-coordinate geometry to seven equivalent Ga atoms. There are five shorter (2.83 Å) and two longer (3.02 Å) Zr–Ga bond lengths. Ga is bonded in a 9-coordinate geometry to seven equivalent Zr and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.55 Å.

36 MATERIALS SCIENCE↗