The enantiotropic phase transition of antimony(III) oxide

Jones, Susan; Fenerty, J.; Pearce, J. N.

doi:10.1016/0040-6031(87)80241-1

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…A recent study of β-Sb 2 O 3 under high pressure revealed a potential new phase and indicated changes in the interactions between lone pairs at several critical points [16]. There is extensive work concerning the phase transformation of α-Sb 2 O 3 to β-Sb 2 O 3 [17][18][19][20][21][22][23][24][25][26][27]. However, we did not find any investigation of the lattice anharmonicity or of the lattice constants below room temperature in either the α or β phases.…”

Section: Introductioncontrasting

confidence: 63%

Structure and Anharmonicity of α- and β-Sb2O3 at Low Temperature

et al. 2023

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Antimony oxides are important materials for catalysis and flame-retardant applications. The two most common phases, α-Sb2O3 (senarmontite) and β-Sb2O3 (valentinite), have been studied extensively. Specific focus has been placed recently on their lattice dynamics properties and how they relate to the α-β phase transformation and their potential anharmonicity. However, there has not been any direct investigation of anharmonicity in these systems, and a surprising lack of low-temperature structural information has prevented further study. Here, we report the powder neutron diffraction data of both phases of Sb2O3, as well as structural information. α-Sb2O3 behaved as expected, but β-Sb2O3 revealed a small region of zero thermal expansion along the c axis. Additionally, while the β phase matched well with reported atomic displacement parameters, the α phase displayed a marked deviation. This data will enable further investigations into these systems.

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Section: Introductioncontrasting

confidence: 63%

Structure and Anharmonicity of α- and β-Sb2O3 at Low Temperature

et al. 2023

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“…Figure 1 also shows a sequence of X-ray diffraction patterns for such a thermal excursion; initial equilibration at 1,000 °C, a second anneal at 750 °C, and finally a return to 1,000 °C. The transformation from single phase, to multiphase, to single phase is evident by the X-ray patterns and demonstrates an enantiotropic (that is, reversible with temperature 32 ) phase transition.…”

Section: Resultsmentioning

confidence: 98%

Entropy-stabilized oxides

et al. 2015

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Configurational disorder can be compositionally engineered into mixed oxide by populating a single sublattice with many distinct cations. The formulations promote novel and entropy-stabilized forms of crystalline matter where metal cations are incorporated in new ways. Here, through rigorous experiments, a simple thermodynamic model, and a five-component oxide formulation, we demonstrate beyond reasonable doubt that entropy predominates the thermodynamic landscape, and drives a reversible solid-state transformation between a multiphase and single-phase state. In the latter, cation distributions are proven to be random and homogeneous. The findings validate the hypothesis that deliberate configurational disorder provides an orthogonal strategy to imagine and discover new phases of crystalline matter and untapped opportunities for property engineering.

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“…Early studies have shown that the cubic form, senarmontite, is stable up to 570 °C and that valentinite is stable between 570 °C and its melting point at 650 °C, 23 while other works on thermal phase transitions from senarmontite (cubic) to valentinite (orthorhombic) Sb 2 O 3 have reported values of transition temperature in the range 556-655 °C. [24][25][26][27] On the other hand, in ref. 28, mechanically milled valentinite was found to convert to senarmontite at a lower temperature of 445 °C, probably due to the small particle size of the milled samples.…”

Section: Introductionmentioning

confidence: 98%

Raman study of phase transitions induced by thermal annealing and laser irradiation in antimony oxide micro- and nanostructures

2016

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Phase transitions between the cubic and orthorhombic phases of Sb 2 O 3 micro-and nanostructures and the orthorhombic phase of Sb 2 O 4 have been investigated. The phase transformations were assessed by micro Raman spectroscopy. Thermal annealing of cubic phase triangular structures showed a partial transformation to Sb 2 O 4 (cervantite) at 400 °C. However, during the thermal treatment, the specific morphology of the structures was lost. Laser irradiation with 325 nm light on a confocal microscope induced local phase transformations between the orthorhombic and cubic phases. For small structures, such as orthorhombic nanorods and cubic nanotriangles, the irradiation led to the formation of Sb 2 O 4 .

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The enantiotropic phase transition of antimony(III) oxide

Cited by 10 publications

References 4 publications

Structure and Anharmonicity of α- and β-Sb2O3 at Low Temperature

Structure and Anharmonicity of α- and β-Sb2O3 at Low Temperature

Entropy-stabilized oxides

Raman study of phase transitions induced by thermal annealing and laser irradiation in antimony oxide micro- and nanostructures

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