Systematics of the spinel structure type

Hill, R. J.; Craig, James R.; Gibbs, G. V.

doi:10.1007/bf00307535

Cited by 685 publications

(375 citation statements)

References 20 publications

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“…Notice also that as u is lower than 0.2625 the A-N distances in the octahedra (d A o -N ) are greater than in the tetrahedra (d A t -N ). 28 Some differences appear with respect to previous values of the bulk modulus. In particular, we suspect that the experimental value (B 0 ϭ296 GPa) reported for ␥-Ge 3 N 4 ͑Ref.…”

Section: Resultsmentioning

confidence: 75%

Origin of the low compressibility in hard nitride spinels

et al. 2003

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A microscopic investigation of first-principles electron densities of ␥-A 3 N 4 ͑A:C,Si,Ge͒ spinels reveals a clear relationship between the compressibility and the chemical bonding of these materials. Three striking findings emanate from this analysis: ͑i͒ the chemical graph is governed by a network of highly directional strong bonds with covalent character in ␥-C 3 N 4 and different degrees of ionic polarization in ␥-Si 3 N 4 and ␥-Ge 3 N 4 , ͑ii͒ nitrogen is the lowest compressible atom controlling the trend in the bulk modulus of the solids, and ͑iii͒ the group-IV counterions show strong site dependent compressibilities enhancing the difficulty in the synthesis of the spinel phases of these nitrides.

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Section: Resultsmentioning

confidence: 75%

Origin of the low compressibility in hard nitride spinels

et al. 2003

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“…The set of the data collected in Table 1 is considerably extended if compared to that one from Ref. 36 ; more recent literature data were used when compiling Table 1.…”

Section: Introductionmentioning

confidence: 99%

Lattice Parameters and Stability of the Spinel Compounds in Relation to the Ionic Radii and Electronegativities of Constituting Chemical Elements

2014

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A thorough consideration of the relation between the lattice parameters of 185 binary and ternary spinel compounds, on one side, and ionic radii and electronegativities of the constituting ions, on the other side, allowed for establishing a simple empirical model and finding its linear equation, which links together the above-mentioned quantities. The derived equation gives good agreement between the experimental and modeled values of the lattice parameters in the considered group of spinels, with an average relative error of about 1% only. The proposed model was improved further by separate consideration of several groups of spinels, depending on the nature of the anion (oxygen, sulfur, selenium/tellurium, nitrogen). The developed approach can be efficiently used for prediction of lattice constants for new isostructural materials. In particular, the lattice constants of new hypothetic spinels ZnRE 2 O 4 , CdRE 2 S4, CdRE 2 Se 4 (RE=rare earth elements) are predicted in the present paper. In addition, the upper and lower limits for the variation of the ionic radii, electronegativities and certain their combinations were established, which can be considered as stability criteria for the spinel compounds. The findings of the present paper offer a systematic overview of the structural properties of spinels and can serve as helpful guides for synthesis of new spinel compounds.3

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“…On the other hand, many ferrites have an "inverse" or "partly in verse" structure, where the divalent M2+ cations are distributed both in the octahedral and tetrahedral sites. Since the magnetic properties of ferrite spinels are sensitive to the cation distribution, it is of great importance to determine their degree of inversion [1]. The determination of the cation distribution in ferrites by the usual X-ray diffraction method is generally not easy because the X-ray scattering ability of the com ponent M, such as Zn and Ni, is close to that of host element Fe.…”

Section: Introductionmentioning

confidence: 99%

Cation Distribution of ZnFe₂O₄ and CoFe₂O₄ Spinels From Anomalous X-Ray Scattering

Waseda

Shinoda

Sugiyama

1995

Zeitschrift Für Naturforschung A

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The distribution of Zn2 + and Co2 + cations in ferrite spinels has been determined by applying anomalous X-ray scattering (AXS) near the K absorption edges of Fe, Co and Zn. The energy dependence of the reflection intensities of ZnFe20 4, detected at the Fe K and Zn K absorption edges, can only be explained when all Zn2+ being allocated to the tetrahedral site formed by oxygens. On the other hand, the results for CoFe20 4 suggest that 78% of Co2+ occupy the octahedral site, and that the present CoFe20 4 sample is classified as inverse spinel, although a partial disorder is included. The usefulness of this AXS method coupled with the common Rietveld analysis was well-recognized by determining the cation distribution even in a system with next neighboring elements of the periodic table.

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Systematics of the spinel structure type

Cited by 685 publications

References 20 publications

Origin of the low compressibility in hard nitride spinels

Origin of the low compressibility in hard nitride spinels

Lattice Parameters and Stability of the Spinel Compounds in Relation to the Ionic Radii and Electronegativities of Constituting Chemical Elements

Cation Distribution of ZnFe₂O₄ and CoFe₂O₄ Spinels From Anomalous X-Ray Scattering

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Systematics of the spinel structure type

Cited by 685 publications

References 20 publications

Origin of the low compressibility in hard nitride spinels

Origin of the low compressibility in hard nitride spinels

Lattice Parameters and Stability of the Spinel Compounds in Relation to the Ionic Radii and Electronegativities of Constituting Chemical Elements

Cation Distribution of ZnFe2O4 and CoFe2O4 Spinels From Anomalous X-Ray Scattering

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Cation Distribution of ZnFe₂O₄ and CoFe₂O₄ Spinels From Anomalous X-Ray Scattering