The group IV di-transition metal sulfides and selenides

Franzen, Hugo F.; Smeggil, J. G.; Conard, Bruce R.

doi:10.1016/0025-5408(67)90136-5

Cited by 38 publications

(18 citation statements)

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“…Considering this fact, it is interesting to note that, whereas Ti2S, Ti2Se, ZrzS, and Zr2Se (Franzen, Smeggil & Conard, 1967) are all isostructural with TazP (Nylund, 1966), TaES adopts a radically different structure type. Since the radii of S and P are nearly equal (Slater, 1964), it seems likely that the explanation for this difference lies in a difference in electron concentration.…”

Section: Discussionmentioning

confidence: 99%

The crystal structure of Ta₂S

Franzen¹,

Smeggil²

1969

Acta Crystallogr Sect B

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The crystal structure of ditantalum sulfide, Ta2S, has been determined from single-crystal X-ray diffraction data. The compound crystallizes in the orthorhombic system, space group Pbcm, with unitcell dimensions: a=7"379, b=5"574, and c= 15.19 A. The unit cell contains 12 formula units. Refinement of the structure was performed by a least-squares treatment of the positional parameters and the temperature factor coefficients. The Ta/S structure is fundamentally different from other known metalrich chalconide structures. The structure can be viewed as chains of body-centered pentagonal antiprisms of tantalum atoms sharing faces in one direction and interconnected via sulfur atoms in the other two directions.

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Section: Discussionmentioning

confidence: 99%

The crystal structure of Ta₂S

Franzen¹,

Smeggil²

1969

Acta Crystallogr Sect B

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“…Zr and Ti for bco-like coordinations has previously been discussed [56,111] in terms of the Brewer-Engel correlation [63]. After extensive study, Brewer arrived at the conclusion that s-and p-conduction electrons determine the long-range order of alloy phases.…”

Section: Resultsmentioning

confidence: 97%

“…Cu-AI and Cu-Zn) with differing stoichiometries but with the same ratio of valence electrons to atoms. Electron counting rules, in particular the Hume-Rothery rules [62], have in the Hf-Zrcase has been rationalized through the Brewer-Engel correlation [56,106], and it appears likely that interactions of the f shell with the outer electrons yielding significant differences in the excited-state energies are of importance in the formation of metal-rich structure by 5d metals.…”

Section: M2 (Ot) Sites While the Smallest Amounts Of Ta Were Found Onmentioning

confidence: 99%

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Studies of high temperature ternary phases in mixed-metal-rich early transition metal sulfide and phosphide systems

Marking

1994

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“…In both Zr2S and Zr2~Ss, the sulfur atoms have capped trigonal-prismatic coordination while the metal atoms have capped cubic coordination, as in the b. c. c. structure of pure metals. The tendency for the sulfur atoms to have capped trigonal-prismatic coordination, and for the metal atoms to have capped cubic coordination is common to many metal-rich chalcogenides, (Franzen, Smeggil & Conard, 1967). The purposes of the investigation reported here were to determine the crystal structure of the Zr9S2 phase and to examine and discuss the various coordinations of both metal and chalcogen atoms in metal-rich compounds.…”

Section: Introductionmentioning

confidence: 99%