Partial order in the non-stoichiometric phase Ti2+xS4(0.2&lt;x&lt;1)

Wadsley, A. D.

doi:10.1107/s0365110x57002522

Cited by 31 publications

(11 citation statements)

References 2 publications

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“…The bond lengths for these 'unconstrained' structure types form a self-consistent set (Tables 3 and 4) and are used as the basis for the present discussion. Figure I and Tables 3-8 show that for a particular composition the molar volume decreases with change in structural type in the sequence defect spinel, C rare earth, garnet, rare-earth manganite, corundum, B rare earth, A rare earth, and perovskite, with metaldeficient nickel arsenide structures such as Cr2S3 [Jellinek, 1957] and Ti2S• [Wadsley, 1957] having formula volumes that, relative to their bond lengths, are about the same as for corundums.…”

Section: Scandium Oxide 3245mentioning

confidence: 96%

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High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM₂X₃andABX₃type

Reid¹,

Ringwood²

1969

J. Geophys. Res.

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Sc2O3 has been transformed at 1000°C and 130 kb from the relatively open C‐rare‐earth structure type to the monoclinic B‐rare‐earth form with unit cell dimensions α = 13.173 A, b = 3.194 A, c = 7.976 A, and β = 100.40°. The calculated density, 4.16 g/cm3, represents an increase of 8.3% over the density of C‐type Sc2O3 and reflects an increase in coordination from six to seven fold for two‐thirds of the scandium atoms. Under the same conditions In2O3 was transformed to a corundum form, but a corundum form of Sc2O3 could not be obtained at any intermediate pressure. Graphs of average metal‐oxygen bond length versus molar volume, using these high‐pressure phases as key examples and six‐coordinate bond lengths as reference points, have enabled us to define the molar volume for a given M2X3 or ABX3 composition in any of the denser structural forms. These forms are, in order of decreasing molar volume, defect spinel; C rare earth; garnet; rare‐earth manganite; corundum, which is also equivalent to ilmenite and metal‐deficient nickel arsenide; B rare earth; A rare earth; and perovskite. By fitting reported shock‐wave data to these graphs we conclude that very high‐pressure Fe2O3 is most probably a perovskite, with possible composition Fe2+Fe4+O4, and that very high‐pressure MgSiO3 is probably an ilmenite.

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Section: Scandium Oxide 3245mentioning

confidence: 96%

“…The data extrapolate (D. Anderson, T. J. Ahrens, and A. E. Ringwood, paper in preparation) to a zero-pressure density of 5.96 g/cm •, • value much higher than 5.24 g/cm • observed for aFe•08 (hematite). [Jellinek, 1957] and Ti•.S3 [Wadsley, 1957] and from idealized hexagonal structures [Kjekshus and Pearson, 1964]…”

Section: Scandium Oxide 3245mentioning

confidence: 99%

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM₂X₃andABX₃type

Reid¹,

Ringwood²

1969

J. Geophys. Res.

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“…Die Absch~itzung yon Wertigkeiten ist h/iufig, zumeist aufgrund von (3), vorgenommen worden, z.B. ffir Vanadiumverbindungen (Bystr6m, Wilhelmi & Brotzen, 1950;Wadsley, 1957;Evans & Mrose, 1955, 1958Evans, 1960;Wilhelmi, Waltersson & Kihlborg, 1971;Asbrink, 1980;Hon_g & Asbrink, 1982). W~ihrend sich mit .…”

Section: (B) Absch~tzung Yon Wertigkeitenunclassified

Empirische Beziehungen zu den Bindungslängen in Oxiden. 1. Die Nebengruppenelemente Titan Bis Eisen

Trömel¹

1983

Acta Crystallogr Sect B

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For O bonds of Ti, V, Cr, Mn, and Fe, bondlength-bond-strength relationships which apply to any oxidation state of each metal have been derived from 166 crystal structures. Empirical parameters of the relation s = (R l/R) u (s = bond strength, R = distance M-O) range from 1.76 to 1.81 A for R~ and from 5.4 to 6.0 for N. From these relations, bond lengths and ionic radii can be interpolated or extrapolated in the case of regular coordination. They can also be used to determine valencies or valency distributions and to discuss physical properties.

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“…The Ti atoms are distributed alternately between filled and partially occupied sheets, tending as y approaches 0.5 to the Ti 3 S 4 structure, where the metal layers are alternately filled and half filled. 4 The y or supernumary Ti atoms act as bridges connecting filled Ti sheets, and make a contribution to the density of states at the Fermi energy intrinsically different from that of intercalated donors. Barz et al 5 have discovered that the value of T s in intercalated Ti 1>]L S 2 is about 10 to 13°K, or about twice as great as T s max in the intercalated T(Vb)C 2 family.…”

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confidence: 99%

High-Temperature Superconductivity in Bridge and Layer Compounds

Phillips¹

1972

Phys. Rev. Lett.

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compounds, where A is a monovalent atom or radical, T is an even-valence transition metal, C is a chalcogenide, and the parameters x and y lie in the ranges 0.1<#<,0.3, O^y < 0.5. The model explains why the maximum superconducting transition temperature T s m&x is higher than 12°K in bridge compounds withy =0.1, although the maximum value of T s observed in related layer compounds with y =0.0 is about 6°K.

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Partial order in the non-stoichiometric phase Ti_2+xS₄(0.2<x<1)

Cited by 31 publications

References 2 publications

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM₂X₃andABX₃type

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM₂X₃andABX₃type

Empirische Beziehungen zu den Bindungslängen in Oxiden. 1. Die Nebengruppenelemente Titan Bis Eisen

High-Temperature Superconductivity in Bridge and Layer Compounds

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Partial order in the non-stoichiometric phase Ti2+xS4(0.2<x<1)

Cited by 31 publications

References 2 publications

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM2X3andABX3type

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM2X3andABX3type

Empirische Beziehungen zu den Bindungslängen in Oxiden. 1. Die Nebengruppenelemente Titan Bis Eisen

High-Temperature Superconductivity in Bridge and Layer Compounds

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Partial order in the non-stoichiometric phase Ti_2+xS₄(0.2<x<1)

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM₂X₃andABX₃type

High-pressure scandium oxide and its place in the molar volume relationships of dense structures ofM₂X₃andABX₃type