Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “GeIr”

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 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ca(GeIr)2 by Materials Project

Ca(IrGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Ge atoms. All Ca–Ir bond lengths are 3.35 Å. All Ca–Ge bond lengths are 3.24 Å. Ir is bonded in a 4-coordinate geometry to four equivalent Ca and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.47 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ca, four equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GeIr by Materials Project

IrGe is Modderite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ir is bonded to six equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing IrGe6 octahedra. The corner-sharing octahedra tilt angles range from 46–56°. There are a spread of Ir–Ge bond distances ranging from 2.51–2.62 Å. Ge is bonded in a 6-coordinate geometry to six equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U(GeIr)2 by Materials Project

UIr2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. U is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Ge atoms. All U–Ir bond lengths are 3.33 Å. All U–Ge bond lengths are 3.17 Å. Ir is bonded to four equivalent U and four equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing IrU4Ge4 tetrahedra. All Ir–Ge bond lengths are 2.48 Å. Ge is bonded in a 9-coordinate geometry to four equivalent U, four equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(GeIr)2 by Materials Project

CeIr2Ge2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ce is bonded in a 12-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.24 Å) and four longer (3.38 Å) Ce–Ir bond lengths. There are four shorter (3.27 Å) and four longer (3.28 Å) Ce–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Ce and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.52 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Ce and five Ge atoms. There are one shorter (2.45 Å) and four longer (2.50 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Ce and five Ir atoms. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Ce and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(GeIr)2 by Materials Project

Eu(IrGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Ge atoms. All Eu–Ir bond lengths are 3.38 Å. All Eu–Ge bond lengths are 3.26 Å. Ir is bonded to four equivalent Eu and four equivalent Ge atoms to form a mixture of distorted corner, edge, and face-sharing IrEu4Ge4 tetrahedra. All Ir–Ge bond lengths are 2.48 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Eu, four equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.66 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(GeIr)2 by Materials Project

SrIr2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Ge atoms. All Sr–Ir bond lengths are 3.44 Å. All Sr–Ge bond lengths are 3.31 Å. Ir is bonded to four equivalent Sr and four equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing IrSr4Ge4 tetrahedra. All Ir–Ge bond lengths are 2.49 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sr, four equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.81 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(GeIr)2 by Materials Project

Sm(IrGe)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.23 Å) and four longer (3.37 Å) Sm–Ir bond lengths. All Sm–Ge bond lengths are 3.27 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Sm and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.51 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Sm and five Ge atoms. There are one shorter (2.44 Å) and four longer (2.50 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Sm and four equivalent Ir atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Sm and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaLa(GeIr)4 by Materials Project

CaLa(IrGe)4 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Ge atoms. All Ca–Ir bond lengths are 3.38 Å. All Ca–Ge bond lengths are 3.25 Å. La is bonded in a 8-coordinate geometry to eight equivalent Ir and eight equivalent Ge atoms. All La–Ir bond lengths are 3.38 Å. All La–Ge bond lengths are 3.27 Å. Ir is bonded to two equivalent Ca, two equivalent La, and four Ge atoms to form a mixture of distorted edge, corner, and face-sharing IrCa2La2Ge4 tetrahedra. There are two shorter (2.48 Å) and two longer (2.50 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Ca, four equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.60 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent La, four equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuIn2(GeIr)4 by Materials Project

EuIn2(IrGe)4 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to four equivalent Ir, four equivalent In, and eight equivalent Ge atoms. All Eu–Ir bond lengths are 3.51 Å. All Eu–In bond lengths are 3.51 Å. There are four shorter (3.25 Å) and four longer (3.58 Å) Eu–Ge bond lengths. Ir is bonded in a 6-coordinate geometry to one Eu, two equivalent In, and four equivalent Ge atoms. Both Ir–In bond lengths are 2.79 Å. There are a spread of Ir–Ge bond distances ranging from 2.40–2.63 Å. In is bonded in a 10-coordinate geometry to two equivalent Eu, four equivalent Ir, and four equivalent Ge atoms. All In–Ge bond lengths are 3.09 Å. Ge is bonded in a 5-coordinate geometry to two equivalent Eu, four equivalent Ir, and two equivalent In atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3(GeIr)4 by Materials Project

Ca3(IrGe)4 crystallizes in the cubic I-43m space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to four equivalent Ir and four equivalent Ge atoms. All Ca–Ir bond lengths are 3.15 Å. All Ca–Ge bond lengths are 3.14 Å. Ir is bonded in a 7-coordinate geometry to three equivalent Ca and four equivalent Ge atoms. There are one shorter (2.37 Å) and three longer (2.53 Å) Ir–Ge bond lengths. Ge is bonded in a 7-coordinate geometry to three equivalent Ca and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La(GeIr)2 by Materials Project

La(IrGe)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. La is bonded in a 12-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.27 Å) and four longer (3.40 Å) La–Ir bond lengths. All La–Ge bond lengths are 3.31 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent La and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.54 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent La and five Ge atoms. There are one shorter (2.49 Å) and four longer (2.53 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent La and four equivalent Ir atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent La and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U(GeIr)2 by Materials Project

UIr2Ge2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. U is bonded in a 12-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.18 Å) and four longer (3.36 Å) U–Ir bond lengths. There are four shorter (3.23 Å) and four longer (3.24 Å) U–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded to four equivalent U and four equivalent Ge atoms to form distorted IrU4Ge4 tetrahedra that share corners with twelve equivalent GeU4Ir4 tetrahedra, edges with two equivalent GeU4Ir4 tetrahedra, edges with four equivalent IrU4Ge4 tetrahedra, and faces with four equivalent IrU4Ge4 tetrahedra. All Ir–Ge bond lengths are 2.50 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent U and five Ge atoms. There are one shorter (2.40 Å) and four longer (2.49 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four equivalent U and four equivalent Ir atoms to form distorted GeU4Ir4 tetrahedra that share corners with twelve equivalent IrU4Ge4 tetrahedra, edges with two equivalent IrU4Ge4 tetrahedra, edges with four equivalent GeU4Ir4 tetrahedra, and faces with four equivalent GeU4Ir4 tetrahedra. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent U and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr2(GeIr)3 by Materials Project

Pr2(IrGe)3 crystallizes in the tetragonal P4/mmm space group. The structure is one-dimensional and consists of one Pr2(IrGe)3 ribbon oriented in the (0, 0, 1) direction. Pr is bonded in a linear geometry to one Ir and one Ge atom. The Pr–Ir bond length is 2.32 Å. The Pr–Ge bond length is 2.84 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a linear geometry to one Pr and one Ge atom. The Ir–Ge bond length is 2.31 Å. In the second Ir site, Ir is bonded in a linear geometry to two equivalent Ge atoms. Both Ir–Ge bond lengths are 2.32 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a linear geometry to one Pr and one Ir atom. In the second Ge site, Ge is bonded in a linear geometry to two equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(GeIr)2 by Materials Project

PrIr2Ge2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.27 Å) and four longer (3.36 Å) Pr–Ir bond lengths. There are four shorter (3.28 Å) and four longer (3.31 Å) Pr–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Pr and five Ge atoms. There are one shorter (2.46 Å) and four longer (2.51 Å) Ir–Ge bond lengths. In the second Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.53 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Pr and five Ir atoms. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd(GeIr)2 by Materials Project

Nd(IrGe)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Nd is bonded in a 12-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.25 Å) and four longer (3.39 Å) Nd–Ir bond lengths. There are four shorter (3.27 Å) and four longer (3.29 Å) Nd–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Nd and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.53 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Nd and five Ge atoms. There are one shorter (2.46 Å) and four longer (2.50 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Nd and four equivalent Ir atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Nd and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th(GeIr)2 by Materials Project

Th(IrGe)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight Ir and eight Ge atoms. There are four shorter (3.26 Å) and four longer (3.35 Å) Th–Ir bond lengths. There are four shorter (3.26 Å) and four longer (3.30 Å) Th–Ge bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ge atoms. All Ir–Ge bond lengths are 2.53 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Th and five Ge atoms. There are one shorter (2.44 Å) and four longer (2.51 Å) Ir–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ir atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Th and five Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Beyond the Global Brain Differences: Intraindividual Variability Differences in 1q21.1 Distal and 15q11.2 BP1-BP2 Deletion Carriers

Carriers of the 1q21.1 distal and 15q11.2 BP1-BP2 copy number variants exhibit regional and global brain differences compared with noncarriers. However, interpreting regional differences is challenging if a global difference drives the regional brain differences. Intraindividual variability measures can be used to test for regional differences beyond global differences in brain structure. Magnetic resonance imaging data were used to obtain regional brain values for 1q21.1 distal deletion (n = 30) and duplication (n = 27) and 15q11.2 BP1-BP2 deletion (n = 170) and duplication (n = 243) carriers and matched noncarriers (n = 2350). Regional intra-deviation scores, i.e., the standardized difference between an individual’s regional difference and global difference, were used to test for regional differences that diverge from the global difference. For the 1q21.1 distal deletion carriers, cortical surface area for regions in the medial visual cortex, posterior cingulate, and temporal pole differed less and regions in the prefrontal and superior temporal cortex differed more than the global difference in cortical surface area. For the 15q11.2 BP1-BP2 deletion carriers, cortical thickness in regions in the medial visual cortex, auditory cortex, and temporal pole differed less and the prefrontal and somatosensory cortex differed more than the global difference in cortical thickness. We find evidence for regional effects beyond differences in global brain measures in 1q21.1 distal and 15q11.2 BP1-BP2 copy number variants. The results provide new insight into brain profiling of the 1q21.1 distal and 15q11.2 BP1-BP2 copy number variants, with the potential to increase understanding of the mechanisms involved in altered neurodevelopment.

15q11.2 BP1-BP2↗
DOE OSTI2025

Experimental investigation of flow distribution in enhanced geothermal systems with deep eutectic solvent

Geothermal energy has been recognized as a valuable alternative to fossil fuels and nuclear power, as it is renewable and reliable. Enhanced Geothermal Systems (EGSs) have the potential to expand geothermal energy production by enabling access to previously untapped geothermal resources. Geothermal short-circuiting poses a significant challenge to EGS development, leading to reduced heat extraction. Deep Eutectic Solvent (DES) exhibits favorable thermal and rheological properties, making it a candidate for geothermal applications. Here, this paper examines Choline Chloride-Based Deep Eutectic Solvent (DES) as a working fluid in geothermal applications and its potential to mitigate geothermal short-circuiting. Hydraulic experiments using a dual fracture flow loop were conducted at high temperatures. The results showed that DES exhibited higher differential pressure behavior compared to water. Flow distribution results revealed that DES enhances flow allocation within the small fracture, particularly when a temperature difference exists between fractures. Specifically, DES increased flow distribution by an average of 11% when the temperature difference was 85°C, and by 13% when the difference was 45°C, relative to water. These findings suggest that DES responds to thermal fracture differences, making it a potential remedy to address geothermal short-circuiting.

15 GEOTHERMAL ENERGY↗