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- W2153221641 endingPage "2813" @default.
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- W2153221641 abstract "A structural investigation is reported of polymorphs of Ga2O3 that, despite much interest in their properties, have hitherto remained uncharacterised due to structural disorder. The most crystalline sample yet reported of γ-Ga2O3 was prepared by solvothermal oxidation of gallium metal in ethanolamine. Structure refinement using the Rietveld method reveals γ-Ga2O3 has a defect Fdm spinel structure, while pair distribution function analysis shows that the short-range structure is better modelled with local F3m symmetry. In further solvothermal oxidation reactions a novel gallium oxyhydroxide, Ga5O7(OH), is formed, the thermal decomposition of which reveals a new, transient gallium oxide polymorph, κ-Ga2O3, before transformation into β-Ga2O3. In contrast, the thermal decomposition of Ga(NO3)3⋅9 H2O first forms ε-Ga2O3 and then β-Ga2O3. Examination of in situ thermodiffraction data shows that ε-Ga2O3 is always contaminated with β-Ga2O3 and with this knowledge a model for its structure was deduced and refined—space group P63mc with a ratio of tetrahedral/octahedral gallium of 2.2:1 in close-packed oxide layers. Importantly, thermodiffraction provides no evidence for the existence of the speculated bixbyite structured δ-Ga2O3; at the early stages of thermal decomposition of Ga(NO3)3⋅9 H2O the first distinct phase formed is merely small particles of ε-Ga2O3." @default.
- W2153221641 created "2016-06-24" @default.
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- W2153221641 creator A5067425313 @default.
- W2153221641 creator A5084275683 @default.
- W2153221641 creator A5085784257 @default.
- W2153221641 date "2013-01-10" @default.
- W2153221641 modified "2023-10-10" @default.
- W2153221641 title "Structures of Uncharacterised Polymorphs of Gallium Oxide from Total Neutron Diffraction" @default.
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- W2153221641 doi "https://doi.org/10.1002/chem.201203359" @default.
- W2153221641 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23307528" @default.
- W2153221641 hasPublicationYear "2013" @default.
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