Superconductivity and crystal structure of a new class of ternary transition metal phosphides TT/t'P (TZr, Nb, Ta and T/t'Ru, Rh)

Müller, Richard; Shelton, R.N.; Richardson, J. W.; Jacobson, R. A.

doi:10.1016/0022-5088(83)90240-0

Cited by 61 publications

(32 citation statements)

References 5 publications

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“…Accordingly, as observed for most of the structures reported today, the main deviations from the ideal h.c. packing strongly depend on the presence of tetrahedral and pyramidal sites. These deviations are involved sometimes in the formation of metallic clusters, e.g., ZrRuP (11).…”

Section: (B) Structures With 5-pyramidal and 4-tetrahedral Sites Of Xmentioning

confidence: 99%

M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

Pivan

Guérin

1998

Journal of Solid State Chemistry

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Section: (B) Structures With 5-pyramidal and 4-tetrahedral Sites Of Xmentioning

confidence: 99%

M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

Pivan

Guérin

1998

Journal of Solid State Chemistry

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“…o-MoRuP is confirmed to be isostructural to o-ZrRuP (Co 2 Si structure type͒, which was characterized by Muller et al using single-crystal x-ray diffraction methods. 10 The space group Pnma ͑No. 62͒ was chosen to conform to the standard setting.…”

Section: B X-ray Rietveld Refinementsmentioning

confidence: 99%

“…In this paper, we present the results of first-principles calculations of the electronic structure of o-MoRuP based on the newly refined structure. A similar calculation on o-ZrRuP (T c ϳ4 K) is also carried out using the structure determined by Muller et al 10 By comparing the results of these two crystals, we can delineate the subtle difference in the structure and bonding of the two crystals, identify the factors that lead to the differences in T c , and shed some light on the nature of superconductivity in the TTЈX alloys in general.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11] In TTЈX, T is conventionally to the left of TЈ in the periodic table. In recent years, the phosphides and silicides received increased attention because of the interesting superconductivity properties.…”

Section: Introductionmentioning

confidence: 99%

“…Alloys in the orthorhombic phase generally have lower T c of less than 5 K. Arguments had been made that this is probably due to the different layered structures in the hexagonal and orthorhombic phases that resulted in different T-T and TЈ-TЈ connectivity. 10 It is therefore significant that the new o-MoRuP can have T c as high as 15.5 K. 17,18 A sound explanation of this difference requires detailed information on the electronic structures of these alloys, which is the second goal of this investigation. In the past, most of the explanation for the difference in T c in TTЈX alloys was based on indirect evidence such as the number of electrons per crystal and the Mo-Mo interatomic bond distances, etc.…”

Section: Introductionmentioning

confidence: 99%

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Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Wong‐Ng

Ching

et al. 2003

Phys. Rev. B

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The orthorhombic superconductor MoRuP (o-MoRuP) was prepared under high pressure, and its structure was refined using the x-ray Rietveld technique. The grayish-black sample of o-MoRuP is a superconductor with T c ϭ15.5 K and having space group Pnma and lattice parameters aϭ6.03503(16) Å, b ϭ3.85311(8) Å, and cϭ6.94355(17) Å, Vϭ161.463(7) Å. 3 The structure of o-MoRuP is characterized by layers ͑parallel to the ac plane͒ of Mo, Ru, and P atoms. Based on the accurately determined crystal structure, the band structure and the density of states ͑DOS͒ of o-MoRuP were calculated by a first-principles densityfunctional method and compared with those of the isostructural superconductor o-ZrRuP (T c ϭ4 K). It is shown that the high T c in o-MoRuP is directly related to the higher level of the DOS at the Fermi level (E F ) and is traced to be predominantly from the Mo 4d orbitals. The calculated values of the DOS at E F are 0.46 and 0.33 states/eV atom for the Mo and Zr analogs, respectively. The electronic bonding in these two crystals is analyzed in terms of the Mulliken effective charge and the bond order values. The bonding in o-MoRuP differs from that in o-ZrRuP in that there is a short ͑2.44 Å͒ Mo-P bond. The x-ray reference pattern of o-MoRuP prepared using a Rietveld decomposition technique has been submitted to the International Center for Diffraction Data to be included in the Powder Diffraction File.

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Phosphides: Solid‐State Chemistry

Pöttgen

Hönle

2005

Encyclopedia of Inorganic Chemistry

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The solid‐state chemistry of phosphides, phosphide oxides, and phosphide halides is reviewed. Phosphorus is outstanding, since no other element approaches phosphorus in the variety of homoatomic connected polyanions formed, as a result of its relatively low electronegativity and stereochemical features. The article covers the various synthesis techniques for solid‐state phosphides, the crystal chemistry, and chemical bonding. Besides the metal‐rich phosphides with pronounced metal–metal bonding, the large family of polyphosphides, which exhibits an unexpected wealth of chemical composition, is discussed. Furthermore, the largely varying magnetic, electronic, and catalytic properties are reviewed.

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Superconductivity and crystal structure of a new class of ternary transition metal phosphides TT/t'P (TZr, Nb, Ta and T/t'Ru, Rh)

Cited by 61 publications

References 5 publications

M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Phosphides: Solid‐State Chemistry

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