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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.

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28 records · Page 2
All sourcesNASA NTRSDOE OSTI
NASA NTRS1987

Grace DAKASEP alkaline battery separator

The Grace DAKASEP separator was originally developed as a wicking layer for nickel-zinc alkaline batteries. The DAKASEP is a filled non-woven separator which is flexible and heat sealable. Through modification of formulation and processing variables, products with a variety of properties can be produced. Variations of DAKASEP were tested in Ni-H2, Ni-Zn, Ni-Cd, and primary alkaline batteries with good results. The properties of DAKASEP which are optimized for Hg-Zn primary batteries are shown in tabular form. This separator has high tensile strength, 12 micron average pore size, relatively low porosity at 46-48 percent, and consequently moderately high resistivity. Versions were produced with greater than 70 percent porosity and resistivities in 33 wt percent KOH as low as 3 ohm cm. Performance data for Hg-Zn E-1 size cells containing DAKASEP with the properties shown in tabular form, are more reproducible than data obtained with a competitive polypropylene non-woven separator. In addition, utilization of active material is in general considerably improved.

Giovannoni, R. T.↗
DOE OSTI2024

Broadband and Tunable Microwave Absorption Properties from Large Magnetic Loss in Ni–Zn Ferrite

Highly effective electromagnetic (EM) wave absorber materials with strong reflection loss (RL) and a wide absorption bandwidth (EBW) in gigahertz (GHz) frequencies are crucial for advanced wireless applications and portable electronics. Traditional microwave absorbers lack magnetic loss and struggle with impedance matching, while ferrites are stable, exhibit excellent magnetic and dielectric losses, and offer better impedance matching. However, achieving the desired EBW in ferrites remains a challenge, necessitating further composition design. In this study, impedance matching is successfully enhanced and EBW in Ni–Zn ferrite is broadened by successive doping with Mn and Co , without incorporation of any polymer filler. It is found that Ni 0.4 Co 0.1 Zn 0.5 Fe 1.9 Mn 0.1 O 4 material exhibits exceptional EM wave absorption, with a maximum RL of −48.7 dB. It also featured a significant EBW of 10.8 GHz, maintaining a 90% absorption rate (RL < −10 dB) for a thickness of 4.5 mm. These outstanding properties result from substantial magnetic losses and favorable impedance matching. These findings represent a significant step forward in the development of microwave absorber materials, addressing EM wave pollution concerns within GHz frequencies, including the frequency band used in popular 5G technology.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn11Ni2 by Materials Project

Ni2Zn11 crystallizes in the cubic I-43m space group. The structure is three-dimensional. Ni is bonded in a distorted q6 geometry to twelve Zn atoms. There are a spread of Ni–Zn bond distances ranging from 2.57–2.73 Å. There are three inequivalent Zn sites. In the first Zn site, Zn is bonded in a 12-coordinate geometry to three equivalent Ni and nine Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.61–2.66 Å. In the second Zn site, Zn is bonded in a 2-coordinate geometry to two equivalent Ni and nine Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.60–2.97 Å. In the third Zn site, Zn is bonded in a 7-coordinate geometry to two equivalent Ni and eleven Zn atoms. The Zn–Zn bond length is 2.58 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnNi by Materials Project

NiZn is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ni is bonded in a body-centered cubic geometry to eight equivalent Zn atoms. All Ni–Zn bond lengths are 2.50 Å. Zn is bonded in a body-centered cubic geometry to eight equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnNi by Materials Project

NiZn is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Ni is bonded to four equivalent Zn atoms to form corner-sharing NiZn4 tetrahedra. All Ni–Zn bond lengths are 2.31 Å. Zn is bonded to four equivalent Ni atoms to form corner-sharing ZnNi4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnNi3 by Materials Project

ZnNi3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ni is bonded to eight equivalent Ni and four equivalent Zn atoms to form NiZn4Ni8 cuboctahedra that share corners with twelve equivalent NiZn4Ni8 cuboctahedra, edges with eight equivalent ZnNi12 cuboctahedra, edges with sixteen equivalent NiZn4Ni8 cuboctahedra, faces with four equivalent ZnNi12 cuboctahedra, and faces with fourteen equivalent NiZn4Ni8 cuboctahedra. All Ni–Ni bond lengths are 2.52 Å. All Ni–Zn bond lengths are 2.52 Å. Zn is bonded to twelve equivalent Ni atoms to form ZnNi12 cuboctahedra that share corners with twelve equivalent ZnNi12 cuboctahedra, edges with twenty-four equivalent NiZn4Ni8 cuboctahedra, faces with six equivalent ZnNi12 cuboctahedra, and faces with twelve equivalent NiZn4Ni8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn3Ni by Materials Project

NiZn3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ni is bonded to twelve Zn atoms to form NiZn12 cuboctahedra that share corners with four equivalent NiZn12 cuboctahedra, corners with eight equivalent ZnZn8Ni4 cuboctahedra, edges with eight equivalent NiZn12 cuboctahedra, edges with sixteen equivalent ZnZn8Ni4 cuboctahedra, faces with four equivalent NiZn12 cuboctahedra, and faces with fourteen ZnZn8Ni4 cuboctahedra. There are four shorter (2.59 Å) and eight longer (2.69 Å) Ni–Zn bond lengths. There are two inequivalent Zn sites. In the first Zn site, Zn is bonded to four equivalent Ni and eight Zn atoms to form ZnZn8Ni4 cuboctahedra that share corners with twelve equivalent ZnZn8Ni4 cuboctahedra, edges with eight equivalent NiZn12 cuboctahedra, edges with sixteen ZnZn8Ni4 cuboctahedra, faces with four equivalent NiZn12 cuboctahedra, and faces with fourteen ZnZn8Ni4 cuboctahedra. There are four shorter (2.59 Å) and four longer (2.69 Å) Zn–Zn bond lengths. In the second Zn site, Zn is bonded to four equivalent Ni and eight equivalent Zn atoms to form distorted ZnZn8Ni4 cuboctahedra that share corners with four equivalent ZnZn8Ni4 cuboctahedra, corners with eight equivalent NiZn12 cuboctahedra, edges with twenty-four ZnZn8Ni4 cuboctahedra, faces with six equivalent NiZn12 cuboctahedra, and faces with twelve ZnZn8Ni4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn22Ni3 by Materials Project

Ni3Zn22 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a distorted q6 geometry to eleven Zn atoms. There are a spread of Ni–Zn bond distances ranging from 2.50–2.64 Å. In the second Ni site, Ni is bonded in a cuboctahedral geometry to twelve Zn atoms. There are a spread of Ni–Zn bond distances ranging from 2.53–2.63 Å. There are eight inequivalent Zn sites. In the first Zn site, Zn is bonded in a 2-coordinate geometry to two Ni and six Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.61–3.03 Å. In the second Zn site, Zn is bonded in a 11-coordinate geometry to two equivalent Ni and nine Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.60–2.72 Å. In the third Zn site, Zn is bonded in a 2-coordinate geometry to two Ni and four Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.63–2.76 Å. In the fourth Zn site, Zn is bonded in a 1-coordinate geometry to one Ni and ten Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.55–2.88 Å. In the fifth Zn site, Zn is bonded in a 1-coordinate geometry to one Ni and twelve Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.55–3.00 Å. In the sixth Zn site, Zn is bonded in a 10-coordinate geometry to one Ni and nine Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.60–2.76 Å. In the seventh Zn site, Zn is bonded in a 12-coordinate geometry to one Ni and eleven Zn atoms. There are a spread of Zn–Zn bond distances ranging from 2.56–2.97 Å. In the eighth Zn site, Zn is bonded in a 2-coordinate geometry to two equivalent Ni and five Zn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn3Ni by Materials Project

NiZn3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ni is bonded to twelve equivalent Zn atoms to form NiZn12 cuboctahedra that share corners with six equivalent NiZn12 cuboctahedra, corners with twelve equivalent ZnZn8Ni4 cuboctahedra, edges with eighteen equivalent ZnZn8Ni4 cuboctahedra, faces with eight equivalent NiZn12 cuboctahedra, and faces with twelve equivalent ZnZn8Ni4 cuboctahedra. There are six shorter (2.62 Å) and six longer (2.66 Å) Ni–Zn bond lengths. Zn is bonded to four equivalent Ni and eight equivalent Zn atoms to form distorted ZnZn8Ni4 cuboctahedra that share corners with four equivalent NiZn12 cuboctahedra, corners with fourteen equivalent ZnZn8Ni4 cuboctahedra, edges with six equivalent NiZn12 cuboctahedra, edges with twelve equivalent ZnZn8Ni4 cuboctahedra, faces with four equivalent NiZn12 cuboctahedra, and faces with sixteen equivalent ZnZn8Ni4 cuboctahedra. There are a spread of Zn–Zn bond distances ranging from 2.60–2.72 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnNi4 by Materials Project

Ni4Zn crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are five inequivalent Ni sites. In the first Ni site, Ni is bonded to nine Ni and three equivalent Zn atoms to form NiZn3Ni9 cuboctahedra that share corners with twelve NiZn3Ni9 cuboctahedra, edges with six equivalent ZnZn6Ni6 cuboctahedra, edges with eighteen NiZn3Ni9 cuboctahedra, faces with six equivalent ZnZn6Ni6 cuboctahedra, and faces with twelve NiZn3Ni9 cuboctahedra. There are three shorter (2.48 Å) and six longer (2.53 Å) Ni–Ni bond lengths. All Ni–Zn bond lengths are 2.53 Å. In the second Ni site, Ni is bonded to twelve Ni atoms to form NiNi12 cuboctahedra that share corners with three equivalent ZnZn6Ni6 cuboctahedra, corners with nine NiZn3Ni9 cuboctahedra, edges with three equivalent ZnZn6Ni6 cuboctahedra, edges with twenty-one NiZn3Ni9 cuboctahedra, and faces with eighteen NiZn3Ni9 cuboctahedra. There are three shorter (2.47 Å) and six longer (2.53 Å) Ni–Ni bond lengths. In the third Ni site, Ni is bonded to twelve Ni atoms to form NiNi12 cuboctahedra that share corners with three equivalent ZnZn6Ni6 cuboctahedra, corners with nine NiZn3Ni9 cuboctahedra, edges with three equivalent ZnZn6Ni6 cuboctahedra, edges with twenty-one NiZn3Ni9 cuboctahedra, and faces with eighteen NiZn3Ni9 cuboctahedra. There are three shorter (2.48 Å) and six longer (2.53 Å) Ni–Ni bond lengths. In the fourth Ni site, Ni is bonded to twelve Ni atoms to form NiNi12 cuboctahedra that share corners with three equivalent ZnZn6Ni6 cuboctahedra, corners with nine NiNi12 cuboctahedra, edges with three equivalent ZnZn6Ni6 cuboctahedra, edges with twenty-one NiNi12 cuboctahedra, and faces with eighteen NiNi12 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.47–2.53 Å. In the fifth Ni site, Ni is bonded to twelve Ni atoms to form NiNi12 cuboctahedra that share corners with three equivalent ZnZn6Ni6 cuboctahedra, corners with nine NiNi12 cuboctahedra, edges with three equivalent ZnZn6Ni6 cuboctahedra, edges with twenty-one NiNi12 cuboctahedra, and faces with eighteen NiNi12 cuboctahedra. There are three shorter (2.48 Å) and six longer (2.53 Å) Ni–Ni bond lengths. Zn is bonded to six equivalent Ni and six equivalent Zn atoms to form ZnZn6Ni6 cuboctahedra that share corners with six NiNi12 cuboctahedra, corners with six equivalent ZnZn6Ni6 cuboctahedra, edges with six equivalent ZnZn6Ni6 cuboctahedra, edges with eighteen NiNi12 cuboctahedra, faces with six equivalent ZnZn6Ni6 cuboctahedra, and faces with twelve equivalent NiZn3Ni9 cuboctahedra. All Zn–Zn bond lengths are 2.53 Å.

36 MATERIALS SCIENCE↗