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DOE OSTI2020

Materials Data on Ni3P by Materials Project

Ni3P crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. there are three inequivalent Ni1+ sites. In the first Ni1+ site, Ni1+ is bonded in a water-like geometry to two equivalent P3- atoms. There are one shorter (2.21 Å) and one longer (2.26 Å) Ni–P bond lengths. In the second Ni1+ site, Ni1+ is bonded in a distorted trigonal non-coplanar geometry to three equivalent P3- atoms. There are a spread of Ni–P bond distances ranging from 2.21–2.35 Å. In the third Ni1+ site, Ni1+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. There are a spread of Ni–P bond distances ranging from 2.29–2.33 Å. P3- is bonded in a 9-coordinate geometry to nine Ni1+ atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1993

The structural and electrical properties of low-resistance Ni contacts to InP

We have investigated the electrical and metallurgical behavior of the Ni-InP contact system. Specific contact resistivity (Rc) values in the low 10 exp -7 Omega-sq cm range are achieved with Ni-only contacts on n-InP by sintering at 400 C for several minutes. The postsinter contact metallization consists of three layers, arranged in the sequence: InP/Ni3P/Ni2P/In. Extended sintering (40 min) at 400 C brings about a rise in Rc to the 10 exp -4 Omega-sq cm range. After extended sintering, the contact metallization is found to consist of only two layers, arranged in the sequence: InP/Ni2P/In. Based on the correlation between low Rc and the presence of Ni3P at the metal-InP interface, it is suggested that the presence of Ni3P is the cause of the low Rc values. We show that the sintering schedule used to achieve low values of Rc is accompanied by substantial metal-InP interdiffusion that results in severe device degradation.

Fatemi, Navid S.↗

DOE OSTI2020

Structure and Behavior of the Ni End-Member Schreibersite Ni 3 P under Compression to 50 GPa

To better understand the potential presence of light element alloys of Fe and Ni in the Earth’s interior, the crystal structure and compressional behavior of the Ni-P binary compound, schreibersite (Ni 3 P), have been investigated using synchrotron X-ray diffraction experiments. Both powder and two single-crystal samples of synthetic Ni 3 P (in different orientations with respect to the loading axis of the diamond anvil cell) were compressed up to approximately 50 GPa at ambient temperature. The compressional data obtained for Ni3P were fitted with a 3rd order Birch–Murnaghan equation of state. All data indicated that the c/a ratio of unit cell parameters remained approximately constant up to about 30 GPa but then increased progressively with pressure, exhibiting a second slight discontinuity at approximately 40 GPa. The changes in unit cell parameters at ~30 GPa and ~40 GPa suggested discontinuous changes in magnetic ordering. Moreover, the threshold of these subtle discontinuities is sensitive to the stress state and orientation of the crystal in the diamond anvil cell. This study is the first report on the compressional behavior of both powder and single-crystal schreibersite at high-pressure (up to 50 GPa). It offers insights into the effects of Ni 3 P components on the compressional behavior of the Earth’s core.

36 MATERIALS SCIENCE↗

NASA NTRS1993

The Achievement of Near-Theoretical-Minimum Contact Resistance to InP

We have investigated the electrical and metallurgical behavior of the InP/Au/Ni contact system. We show that when a layer of Au, 100 A or more in thickness, is introduced between n-InP and Ni contact metallization, specific contact resistivity R, values in the low 10(exp -8) Omega cm(exp 2) range are achieved after sintering. It is suggested that these ultralow values of R(sub c) are due to the presence, at the metal-InP interface, of a Ni3P layer combined with a stoichiometry change in the InP surface. We show, in addition, that it is possible to achieve very low R(sub c) values with this system without incurring device destroying sinter-induced metallurgical interdiffusion.

Fatemi, Navid S.↗