Chemical and structural properties of the system Fe2O3-In2O3

Ristić, Mira; Popović, Stanko; Tonković, Maja; Musić, Svetozar

doi:10.1007/bf02402973

Cited by 29 publications

(14 citation statements)

References 20 publications

(8 reference statements)

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“…Thus, rh‐In 2 O 3 was found 1) in quasi one‐dimensional nanostructures (nanorods,14, 15 nanowires,16 nanofibers,17 nanotubes18), 2) as a product of the calcination of the InOOH at elevated temperatures (300–600 °C)14, 15, 17–22 and 3) in the sol–gel synthesised In 2 O 3 23–25. The stabilisation of the rh‐In 2 O 3 structure under ambient pressure was also observed 1) in the solid solutions In 2 O 3 –SnO 2 22, 26–31 and In 2 O 3 ‐Fe 2 O 3 ,32–34 2) in epitaxial films grown in MOCVD on sapphire (corundum‐type Al 2 O 3 ) substrates35 and in nitrogen‐doped In 2 O 3 thin films 36…”

Section: Introductionmentioning

confidence: 79%

Metastability of Corundum‐Type In₂O₃

Gurlo

Kroll

Riedel

2008

Chemistry A European J

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The description of structural relations between bixbyite‐ and corundum‐type structures is of particular interest because of the common occurrence of both structures. One of the representative examples of the bixbyite to corundum transition is the high‐pressure high‐temperature synthesis of the corundum‐type indium oxide. The wet chemistry synthesis and stabilisation of the corundum‐type In2O3 under ambient pressure conditions calls for a re‐interpretation of the InO phase diagram as well as for the clarification of the phase transitions in In2O3. One of the questions to be clarified is the stability of the corundum‐type In2O3. In the present work we studied the stability of the corundum‐type In2O3 both theoretically (by density‐functional calculations) and experimentally. The synthesis of the corundum‐type In2O3 was performed by the modified non‐alkoxide sol–gel method based on the ammonia‐induced hydrolysis of indium nitrate in methanol. The corundum‐type In2O3 was subjected to thermal analysis (STA) as well as to structural studies, that is, it was examined using X‐ray powder diffraction (XRPD) including in situ XRPD characterisation upon thermal treatment. For the first time we have undoubtedly demonstrated, both theoretically and experimentally, the metastability of the corundum‐type In2O3 polymorph. The In2O3 polymorph appears to be metastable throughout the entire enthalpy–pressure phase diagram. Upon heating, corundum‐type In2O3 transforms irreversibly into cubic bixbyite‐type In2O3 as shown by STA as well as in situ heating XRPD experiments. Computations indicate the existence of another high‐pressure modification of In2O3 with orthorhombic structure, iso‐typic to Rh2O3‐II. We predict this new phase to form at pressures exceeding 15 GPa from both the cubic bixbyite‐type and the corundum‐type modification of In2O3.

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Section: Introductionmentioning

confidence: 79%

Metastability of Corundum‐Type In₂O₃

Gurlo

Kroll

Riedel

2008

Chemistry A European J

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“…The effect of metal doping, including such metals as titanium (1,2), tin (3-7), manganese (8), aluminium (9,10), gallium (11), and indium (12), on the electrical, magnetic, and other physical properties of -Fe O (hematite) has been an area of active investigation for some time. It is generally proposed that the dopant metal ions substitute for Fe> in the corundum-related structure of -Fe O with the consequent formation of cationic and anionic vacancies.…”

Section: Introductionmentioning

confidence: 99%