High-pressure behavior of β-Ga2O3 nanocrystals

Wang, H.; He, Yi; Chen, W.; Zeng, Yingying; Ståhl, Kenny; Kikegawa, Takumi; Jiang, J.Z.

doi:10.1063/1.3296121

Cited by 31 publications

(27 citation statements)

References 31 publications

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“…It has been revealed that the transformation between α and β phases of Ga 2 O 3 is very sluggish . It is implied that the composition evolution with time at a given temperature may give hints about the process of the phase transformation.…”

Section: Resultsmentioning

confidence: 99%

Phase Evolution of Ga₂O₃ Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Shi

Zhang

et al. 2014

J. Am. Ceram. Soc.

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Fine powders of GaOOH nanocrystals are synthesized via a facile hydrolysis process through the solution–solution interface reactions of anhydrous GaCl3 and distilled water followed by subsequent solvothermal treatment at mild conditions. Well‐faceted α‐GaOOH hexagonal prism‐like nanorods are prepared through solvothermal treatment at 180°C with CTAB as the morphology controlling surfactant. Ga2O3 nanocrystals are fabricated via the pyrolysis of α‐GaOOH hexagonal prism‐like nanostructures at temperatures above 410°C. A peculiar back‐transformation from β‐Ga2O3 to α‐Ga2O3 has been observed to occur between about 557°C and 719°C, which is considered to be responsible for the coexistence of the two phases. The phase transformation mechanisms of Ga2O3 at elevated temperatures, as well as the possible transformation route, have been postulated from a thermodynamic point of view.

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Section: Resultsmentioning

confidence: 99%

Phase Evolution of Ga₂O₃ Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Shi

Zhang

et al. 2014

J. Am. Ceram. Soc.

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“…HP studies in group-13-SOs have been conducted on the five compounds. Al 2 O 3 , also known as alumina, is by far the most studied compound [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99], followed by In 2 O 3 [100][101][102][103][104][105][106][107][108][109], Ga 2 O 3 [107,[110][111][112][113][114], and B 2 O 3 [115][116][117][118][119][120][121]. Finally, Tl 2 O 3 has been the least studied compound [122].…”

Section: Group-13 Sesquioxidesmentioning

confidence: 99%

Pressure-Induced Phase Transitions in Sesquioxides

et al. 2019

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Pressure is an important thermodynamic parameter, allowing the increase of matter density by reducing interatomic distances that result in a change of interatomic interactions. In this context, the long range in which pressure can be changed (over six orders of magnitude with respect to room pressure) may induce structural changes at a much larger extent than those found by changing temperature or chemical composition. In this article, we review the pressure-induced phase transitions of most sesquioxides, i.e., A2O3 compounds. Sesquioxides constitute a big subfamily of ABO3 compounds, due to their large diversity of chemical compositions. They are very important for Earth and Materials Sciences, thanks to their presence in our planet’s crust and mantle, and their wide variety of technological applications. Recent discoveries, hot spots, controversial questions, and future directions of research are highlighted.

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“…Additionally, the anisotropy of the observed unit cell expansion is inconsistent with the known elastic properties of β-Ga 2 O 3 . High pressure experiments [39,40] show that, under hydrostatic stress conditions, this material is softest in the [100] and hardest in the [001]. Thus, the formation of over-dense amorphous tracks in a polycrystalline pellet of random crystallite orientation would be expected to produce unit cell expansion that is greatest in a and least in c. In contrast, the data presented in Fig.…”

Section: Similarly Direct Scanning Transmission Electron Microscopy mentioning

confidence: 99%

Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

Tracy

Lang

Severin

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

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The structural response of β-Ga 2 O 3 to irradiation-induced electronic excitation was investigated. A polycrystalline pellet of this material was irradiated with 946 MeV Au ions and the resulting structural modifications were characterized using in situ x-ray diffraction analysis at various ion fluences, up to 1 × 10 13 cm-2. Amorphization was induced, with the accumulation of the amorphous phase following a single-impact mechanism in which each ion produces an amorphous ion track along its path. Concurrent with this phase transformation, an increase in the unit cell volume of the material was observed and quantified using Rietveld refinement. This unit cell expansion increased as a function of ion fluence before saturating at 1.8%. This effect is attributed to the generation of defects in an ion track shell region surrounding the amorphous track cores. The unit cell parameter increase was highly anisotropic, with no observed expansion in the [010] direction. This may be due to the structure of β-Ga 2 O 3 , which exhibits empty channels of connected interstitial sites oriented in this direction.

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High-pressure behavior of β-Ga2O3 nanocrystals

Cited by 31 publications

References 31 publications

Phase Evolution of Ga₂O₃ Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Phase Evolution of Ga₂O₃ Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Pressure-Induced Phase Transitions in Sesquioxides

Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

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High-pressure behavior of β-Ga2O3 nanocrystals

Cited by 31 publications

References 31 publications

Phase Evolution of Ga2O3 Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Phase Evolution of Ga2O3 Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Pressure-Induced Phase Transitions in Sesquioxides

Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

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Product

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Phase Evolution of Ga₂O₃ Produced from Morphology‐Controllable α‐GaOOH Nanocrystals

Phase Evolution of Ga₂O₃ Produced from Morphology‐Controllable α‐GaOOH Nanocrystals