Pressure-Induced Disordering in SnO<sub>2</sub> Nanoparticles

Girao, Helainne Thomeny; Cornier, Thibaut; Danièle, S.; Debord, Régis; Caravaca, M.; Casali, R.; Melinon, P.; Machon, Denis

doi:10.1021/acs.jpcc.7b04079

Cited by 26 publications

(40 citation statements)

References 57 publications

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“…The d-phase, not present in the native state, can therefore be considered as the result of phase transformation, which most probably occurs first in the contact area where the stress is maximum. This is in agreement with a recent study published by Girão et al, who evidenced a propagation of phase transformation in SnO 2 nanoparticles from the surface to the core of the nanoparticles [37].…”

Section: Phase Transformationsupporting

confidence: 94%

Room temperature plasticity and phase transformation of nanometer-sized transition alumina nanoparticles under pressure

et al. 2018

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A powder of transition alumina nanoparticles (including g and a so-called d-type) is compacted at room temperature in a diamond anvil cell (DAC) under pressures ranging from 5 GPa to 20 GPa. Characterization carried out on thin foils prepared by focused ion beam (FIB), from the compacted powder, unambiguously reveals plasticity. High resolution transmission electron microscopy (HRTEM) and electron diffraction also evidence phase transformation of nanoparticles under high pressure and nanoparticles show faceting parallel to the loading direction with a preferential crystallographic orientation of the facets corresponding to {220} planes of gÀAl 2 O 3 . It can also be deduced, from the comparison between the DAC experiments and in situ TEM nano-compression tests on single particles performed in a preceding work, that plasticity is driven by slip bands corresponding to {111} slip planes, common for a spinel structure, such as, for instance, gÀAl 2 O 3 .We also demonstrate that at ambient temperature the transition alumina phase is also prone to structural change under high pressures with the following sequence g-Al 2 O 3 / d * Al 2 O 3 , these two phases coexisting, sometimes, in the same nanoparticle after compaction. Plasticity at room temperature in alumina nanoparticles and the subsequent phase transformation under pressure may have strong impacts on the process of alumina nanostructured ceramics.

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Section: Phase Transformationsupporting

confidence: 94%

Room temperature plasticity and phase transformation of nanometer-sized transition alumina nanoparticles under pressure

et al. 2018

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“…In our case, it appears that the disordering affecting Raman spectra only implies the oxygen sublattice to which Raman spectroscopy is very sensitive to as in the case of pressure-induced transformations in nanoparticles [8]. To the best of our knowledge, such a decoupling between sublattices in simple, dense structures has never been reported [22].…”

Section: Pressure-induced Sublattice Disordering In Sno 2 : Invasive mentioning

confidence: 57%

“…However, recently, a high-pressure study of SnO 2 nanoparticles using Raman spectroscopy has shown a pressure-induced disordering of the anionic sublattice. In fact, while x-ray diffraction, mainly sensitive to the cationic sublattice, does not show any transformation in a sample of 3 nm particles up to 30 GPa [7], Raman spectroscopy probing the oxygen sublattice demonstrates that some pressure-induced disordering occurs at around 14 GPa [8]. This study underlined the interest of combining experimental techniques to obtain a complete picture of the structural evolution.…”

Section: Pressure-induced Sublattice Disordering In Sno 2 : Invasive mentioning

confidence: 77%

Pressure-Induced Sublattice Disordering in SnO2 : Invasive Selective Percolation

et al. 2018

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SnO_{2} powders and single crystal have been studied under high pressure using Raman spectroscopy and ab initio simulations. The pressure-induced changes are shown to drastically depend on the form of the samples. The single crystal exhibits phase transitions as reported in the literature, whereas powder samples show a disordering of the oxygen sublattice in the first steps of compression. This behavior is proposed to be related to the defect density, an interpretation supported by ab initio simulations. The link between the defect density and an amorphouslike Raman signal is discussed in terms of the invasive percolation of the anionic sublattice. The resistance of the cationic sublattice to the disorder propagation is discussed in terms of cation close packing. This result on SnO_{2} may be extended to other systems and questions a "traditional" crystallographic description based on polyhedra packing, as a decoupling between both sublattices is observed.

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“…Both α-PbO 2 -type and CaCl 2 -type phases were found to transform to a modified fluorite-type phase (cubic structure with Pa -3 symmetry) at with further compression up to 21 GPa. How compression tunes the structural properties of SnO 2 has been well studied 10–18 . However, very few works have focused on the effects of pressure on the electrical resistivity of SnO 2 19 , which significantly precludes our understanding of the conduction mechanism of nanocrystalline SnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Effects of high pressure on the electrical resistivity and dielectric properties of nanocrystalline SnO 2

Shen

Wang

et al. 2018

Sci Rep

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The electrical transport and structural properties of tin oxide nanoparticles under compression have been studied by in situ impedance measurements and synchrotron X-ray diffraction (XRD) up to 27.9 GPa. It was found that the conduction of SnO2 can be improved significantly with compression. Abnormal variations in resistivity, relaxation frequency, and relative permittivity were observed at approximately 12.3 and 25.0 GPa, which can be attributed to pressure-induced tetragonal- orthorhombic-cubic structural transitions. The dielectric properties of the SnO2 nanoparticles were found to be a function of pressure, and the dielectric response was dependent on frequency and pressure. The dielectric constant and loss tangent decreased with increasing frequency. Relaxation-type dielectric behaviour dominated at low frequencies. Whereas, modulus spectra indicated that charge carrier short-range motion dominated at high frequencies.

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Pressure-Induced Disordering in SnO₂ Nanoparticles

Cited by 26 publications

References 57 publications

Room temperature plasticity and phase transformation of nanometer-sized transition alumina nanoparticles under pressure

Room temperature plasticity and phase transformation of nanometer-sized transition alumina nanoparticles under pressure

Pressure-Induced Sublattice Disordering in SnO2 : Invasive Selective Percolation

Effects of high pressure on the electrical resistivity and dielectric properties of nanocrystalline SnO 2

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Pressure-Induced Disordering in SnO2 Nanoparticles

Cited by 26 publications

References 57 publications

Room temperature plasticity and phase transformation of nanometer-sized transition alumina nanoparticles under pressure

Room temperature plasticity and phase transformation of nanometer-sized transition alumina nanoparticles under pressure

Pressure-Induced Sublattice Disordering in SnO2 : Invasive Selective Percolation

Effects of high pressure on the electrical resistivity and dielectric properties of nanocrystalline SnO 2

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Pressure-Induced Disordering in SnO₂ Nanoparticles