Structural data of β-Zn7Sb2O12

Russwurm, Winfried; Bruchhaus, R.; Philipsborn, H. von

doi:10.1007/bf00368170

Cited by 8 publications

(11 citation statements)

References 3 publications

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“…Our earlier studies on the α-Sb 2 O 4 -ZnO system confirmed the literature [12][13][14][15][16][17][18] [19]. We have also determined these compounds' thermal properties [19].…”

Section: Indroductionsupporting

confidence: 85%

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Phase relations up to the solidus line in the part of the Sb-Zn-O system

Filipek

Dąbrowska

2009

Open Chemistry

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“…Our earlier studies on the α-Sb 2 O 4 -ZnO system confirmed the literature [12][13][14][15][16][17][18] [19]. We have also determined these compounds' thermal properties [19].…”

Section: Indroductionsupporting

confidence: 85%

“…The total weight gain of the samples depended on their composition and ranged from 0.4 to 3.15% [19]. Moreover, the diffraction lines corresponded to β-Zn 7 Sb 2 O 12 [16,17].…”

Section: Resultsmentioning

confidence: 99%

Phase relations up to the solidus line in the part of the Sb-Zn-O system

Filipek

Dąbrowska

2009

Open Chemistry

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“…The structure of the low‐temperature β‐polymorph is currently under investigation. While it is clear that it has the same stoichiometry as the α‐polymorph, 10,12,13 its structure is not spinel‐like.…”

Section: Resultsmentioning

confidence: 99%

“…The polymorphism, crystal structures and thermodynamic status of Zn 2.33 Sb 0.67 O 4 are not fully established and literature reports give conflicting statements. It is well established that there are two crystallographic forms; one, labelled α, is cubic and appears to be closely related to the spinel structure; 8,9 the other phase, β, is orthorhombic and of unknown structure 10 although it has also been described as a spinel 11 . The literature on the synthesis conditions is confusing since the α‐polymorph can be synthesized at both low temperatures, <900°C, and at high temperatures, >1200°C 1,12–14 …”

Section: Introductionmentioning

confidence: 99%

Polymorphism and Thermodynamic Stability of Zn₇Sb₂O₁₂

Miles

West

2005

Journal of the American Ceramic Society

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The composition Zn2.33Sb0.67O4 (or Zn7Sb2O12) exists in two polymorphic forms. The thermodynamically stable, low‐temperature orthorhombic β form transforms to the high‐temperature cubic α‐polymorph with a spinel structure at 1225°±25°C. The transformation is fully reversible but slower in the α→β direction and therefore, it is easy to preserve the high‐temperature α‐polymorph to lower temperatures where it is kinetically stable but thermodynamically metastable. It is also possible to synthesize the α‐polymorph directly at low temperatures, e.g., 900°C. This synthesis, of a phase that is thermodynamically stable only at high temperatures, but which has sufficient kinetic stability to exist metastably at low temperatures, represents an example of Ostwald's law of successive reactions in which the first phase to crystallize from a reaction mixture is not necessarily the equilibrium phase of lowest free energy. The crystal structure of the α‐polymorph has been confirmed by Rietveld refinement of X‐ray powder diffraction data to be an inverse spinel, (Zn)[Sb2/3Zn4/3]O4, in which octahedral sites contain a disordered, random mixture of Zn and Sb and tetrahedral sites are fully occupied by Zn.

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“…Zn 7 Sb 2 O 12 is polymorphic, transforming from the low temperature orthorhombic ␤-phase Rußwurm et al, 1986͒ to the high temperature inverse spinel type ␣-polymorph ͑Bayer, 1961͒ at 1225Ϯ 25°C ͑Miles and West, 2005͒. Several studies have been performed regarding the effect of dopants such as Ni, Co, and Cr, which are often present in ZnO-based varistor ceramics, on Zn 7 Sb 2 O 12 ͑Harrington et al, 2006.…”

Section: Introductionmentioning

confidence: 99%