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High-pressure chara...
High-pressure characterization of the optical and electronic properties of InVO4, InNbO4, and InTaO4
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- Botella, Pablo (author)
- Luleå tekniska universitet,Materialvetenskap
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- Errandonea, D. (author)
- Universidad de Valencia, Valencia, Spain
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- Garg, A.B. (author)
- Bhabha Atomic Research Centre, Mumbai, India. Homi Bhabha National Institute, Mumbai, India
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- Rodriguez-Hernandez, P. (author)
- Universidad de La Laguna, La Laguna, Spain
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- Muñoz, A. (author)
- Departamento de Física, Instituto de Materiales y Nanotecnología, MALTA Consolider Team, Universidad de La Laguna, La Laguna, Spain
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- Achary, S.N (author)
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
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- Vomiero, Alberto (author)
- Luleå tekniska universitet,Materialvetenskap
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(creator_code:org_t)
- 2019-04-02
- 2019
- English.
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In: SN Applied Sciences. - : Springer. - 2523-3963 .- 2523-3971. ; 1:5
- Related links:
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https://link.springe...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We have studied the electronic properties at ambient pressure and under high pressure of InVO4, InNbO4, and InTaO4 powders, three candidate materials for hydrogen production by means of photocatalytic water splitting using solar energy. A combination of optical absorption and resistivity measurements and band structure calculations have allowed us to determine that these materials are wide band-gap semiconductors with a band-gap energy of 3.62(5), 3.63(5), and 3.79(5) eV for InVO4, InNbO4, and InTaO4, respectively. The last two compounds are indirect band-gap materials, and InVO4 is a direct band-gap material. The pressure dependence of the band-gap energy and the electrical resistivity have been determined too. In the three compounds, the band gap opens under compression until reaching a critical pressure, where a phase transition occurs. The structural transition triggers a band-gap collapse larger than 1.2 eV in the three materials, being the abrupt decrease in the band-gap energy related to an increase in the pentavalent cation coordination number. The phase transitions also cause changes in the electrical resistivity, which can be correlated with changes induced by pressure in the band structure. An explanation to the reported results is provided based upon ab initio calculations. The conclusions attained are of significance for technological applications of the studied oxides.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- Wolframite
- Band gap
- optical properties
- High pressure
- Phase transition
- Electronic properties
- Experimentell fysik
- Experimental Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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