Crystal structure and physical properties of Mg6Cu16Si7-type M6Ni16Si7, for M=Mg, Sc, Ti, Nb, and Ta

Holman, K. L.; Morosan, Emilia; Casey, Philip A.; Li, Lü; Ong, N. P.; Klimczuk, Tomasz; Felser, Claudia; Cava, R. J.

doi:10.1016/j.materresbull.2007.09.023

Cited by 17 publications

(11 citation statements)

References 14 publications

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“…To obtain the magnetic contribution to the heat capacity of Mn 6 Ni 16 Si 7 one needs to subtract that of a suitable lattice match, normally a paramagnetic iso-structural compound. 38 A previous study of the magnetic properties of Ti 6 Ni 16 Si 7 showed a Pauli paramagnetic like behaviour, 25 which was also observed in our measurements of magnetic susceptibility of the compound under an applied magnetic field of 1000 Oe (SI-3).…”

Section: Magnetic Susceptibilitysupporting

confidence: 87%

“…However, the heat capacity as a function of temperature showed a cusp at 140 K for Ti 6 Ni 16 Si 7 (closed circles in Fig. 3a), which is an indication of a phase transition, nevertheless unexpected, given the data of Holman et al 25 and our magnetic measurements. The origin of this anomaly is unclear at present, but apart from this feature, Ti 6 Ni 16 Si 7 appeared to be a reasonable lattice match.…”

Section: Heat Capacity Measurementsupporting

confidence: 57%

“…3c) however, showed S mag of 17.14 J/mol.K at 50 K, 94.03 J/mol.K at 197 K and, 103.9 J/mol.K at 303 K, which exceeds reasonable values for this material, assuming that Mn is the only magnetic atom. The data of Holman et al 25 suggests that there is no ordered moment on the Ni sites in this class of materials.…”

Section: Heat Capacity Measurementmentioning

confidence: 91%

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Magnetic and Structural Studies of G-Phase Compound Mn₆Ni₁₆Si₇

Ahmed¹,

Greedan²,

Boyer

et al. 2018

Inorg. Chem.

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Transition metal compounds with complex crystal structures tend to demonstrate interesting magnetic coupling resulting in unusual magnetic properties. In this work, the structural and magnetic characterization of a single crystal of the Ni-Mn-Si based G-phase compound, Mn 6 Ni 16 Si 7 , grown by the Czochralski method, is reported. In this structure isolated octahedral Mn 6 clusters form a f.c.c. lattice. As each octahedron consists of eight edge-sharing equilateral triangles, the possibility for geometric frustration exists. Magnetization and specific heat measurements showed two magnetic phase transitions at 197 K and 50 K, respectively.At 100 K neutron diffraction on powder samples shows a magnetic structure with k = (001) in which only four of the six Mn spins per cluster order along < 100 > directions giving a two dimensional magnetic structure consistent with intra-cluster frustration. Below the 50 K phase transition the Mn spins cant away from < 100 > directions and a weak moment develops on the two remaining Mn octahedral sites.

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Section: Magnetic Susceptibilitysupporting

confidence: 87%

Section: Heat Capacity Measurementsupporting

confidence: 57%

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Magnetic and Structural Studies of G-Phase Compound Mn₆Ni₁₆Si₇

Ahmed¹,

Greedan²,

Boyer

et al. 2018

Inorg. Chem.

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“…As was mentioned by Holman et al . (2008) for synthetic phases with the Mg 6 Ni 16 Si 7 structure type, such structures can be described conveniently in terms of large intermetallic polyhedra. The nipalarsite structure contains a cluster of eight Ni atoms formed from two interpenetrating Ni 4 tetrahedra (Fig.…”

Section: Description Of the Crystal Structurementioning

confidence: 99%

Nipalarsite, Ni₈Pd₃As₄, a new platinum-group mineral from the Monchetundra Intrusion, Kola Peninsula, Russia

Grokhovskaya

Karimova

Vymazalová

et al. 2019

MinMag

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Nipalarsite, Ni8Pd3As4, is a new platinum-group mineral discovered in the sulfide-bearing orthopyroxenite of the Monchetundra layered intrusion, Kola Peninsula, Russia (67°52′22″N, 32°47′60″E). Nipalarsite forms anhedral grains (5–80 µm in size) in intergrowths with sperrylite, kotulskite, hollingworthite, isomertieite, menshikovite, palarstanide, nielsenite and monchetundtraite enclosed in pentlandite, anthophyllite, actinolite and chlorite. Nipalarsite is brittle, has a metallic lustre and a grey streak. In plane-polarised light, nipalarsite is light grey with a blue tinge. Reflectance values in air (in %) are: 46.06 at 470 nm, 48.74 at 546 nm, 50.64 at 589 nm and 54.12 at 650 nm. Values of VHN20 fall between 400.5 and 449.2 kg.mm–2, with a mean value of 429.9 kg.mm–2, corresponding to a Mohs hardness of ~4. The average result of 27 electron microprobe wavelength dispersive spectroscopy analyses of nipalarsite is (wt.%): Ni 44.011, Pd 28.74, Fe0.32, Cu 0.85, Pt 0.01, Au 0.05, As 25.42, Sb 0.05, Te 0.39, total 99.85. The empirical formula (normalised to 15 atoms per formula unit) is: (Ni8.10Fe0.06)Σ8.16(Pd2.94Cu0.18)Σ3.12(As3.68Te0.03)Σ3.71 or, ideally, Ni8Pd3As4. Nipalarsite is cubic, space group Fm$\bar{3}$m, with a = 11.4428(9) Å, V = 1498.3(4) Å3 and Z = 8. The strongest lines in the powder X-ray diffraction pattern of synthetic Ni8Pd3As4 [d, Å (I) (hkl)] are: 2.859(10)(004), 2.623(6)(313), 2.557(6)(024), 2.334(11)(224), 2.201(35)(115,333), 2.021(100)(044), 1.906(8)(006,244) and 1.429(7)(008). The crystal structure was solved and refined from the single-crystal X-ray diffraction data of synthetic Ni8Pd3As4. The relation between natural and synthetic nipalarsite is illustrated by an electron back-scattered diffraction study of natural nipalarsite. The density calculated on the basis of the empirical formula of nipalarsite is 9.60 g.cm–3. The mineral name corresponds to the three main elements: Ni, Pd and As.

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“…NiTi is a known shape memory alloy (SMA) [15,16,17]. The Ti 6 Ni 16 Si 7 phase, also called G-phase, is a known precipitate in steels and was investigated as a candidate for superconductivity [18,19]. Ti 2 Ni has been tested as a hydrogen storage material [20] as well as for its high-temperature wear properties [21].…”

Section: Introductionmentioning

confidence: 99%

Structural and Functional Properties of the Thin Film System Ti–Ni–Si

et al. 2019

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The thin-film system Ti-Ni-Si was investigated using combinatorial materials science methods. A thin-film composition spread library of the system was fabricated using combinatorial magnetron sputtering. The functional properties Seebeck coefficient, electrical resistivity and luminance were determined using high-throughput characterization techniques. A thin-film phase diagram was established by the assessment of high-throughput X-ray diffraction results. Correlations between composition, phase constitution and functional properties with focus on the binary composition space are discussed.

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Crystal structure and physical properties of Mg6Cu16Si7-type M6Ni16Si7, for M=Mg, Sc, Ti, Nb, and Ta

Abstract: Five compounds were investigated for magnetic character and superconductivity, all with non-magnetic nickel and band structures containing flat bands and steep bands.The syntheses and crystal structures, refined by powder X-ray diffraction, are reported for

Cited by 17 publications

References 14 publications

Magnetic and Structural Studies of G-Phase Compound Mn₆Ni₁₆Si₇

Magnetic and Structural Studies of G-Phase Compound Mn₆Ni₁₆Si₇

Nipalarsite, Ni₈Pd₃As₄, a new platinum-group mineral from the Monchetundra Intrusion, Kola Peninsula, Russia

Structural and Functional Properties of the Thin Film System Ti–Ni–Si

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Crystal structure and physical properties of Mg6Cu16Si7-type M6Ni16Si7, for M=Mg, Sc, Ti, Nb, and Ta

Abstract: Five compounds were investigated for magnetic character and superconductivity, all with non-magnetic nickel and band structures containing flat bands and steep bands.The syntheses and crystal structures, refined by powder X-ray diffraction, are reported for

Cited by 17 publications

References 14 publications

Magnetic and Structural Studies of G-Phase Compound Mn6Ni16Si7

Magnetic and Structural Studies of G-Phase Compound Mn6Ni16Si7

Nipalarsite, Ni8Pd3As4, a new platinum-group mineral from the Monchetundra Intrusion, Kola Peninsula, Russia

Structural and Functional Properties of the Thin Film System Ti–Ni–Si

Contact Info

Product

Resources

About

Magnetic and Structural Studies of G-Phase Compound Mn₆Ni₁₆Si₇

Magnetic and Structural Studies of G-Phase Compound Mn₆Ni₁₆Si₇

Nipalarsite, Ni₈Pd₃As₄, a new platinum-group mineral from the Monchetundra Intrusion, Kola Peninsula, Russia