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Selective kinetic g...
Selective kinetic growth and role of local coordination in forming Al2TiO5-based coatings at lower temperatures
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- Öhman, Sebastian, 1991- (författare)
- Uppsala universitet,Institutionen för kemi - Ångström,Oorganisk kemi,Uppsala University
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- Qiu, Ren, 1993 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Edvinsson, Tomas, Professor, 1970- (författare)
- Uppsala universitet,Oorganisk kemi,Fasta tillståndets fysik,Uppsala University
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- Bäcke, Olof, 1984 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Törndahl, Tobias, 1974- (författare)
- Uppsala universitet,Solcellsteknik,Uppsala University
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- Boman, Mats (författare)
- Uppsala universitet,Oorganisk kemi,Uppsala University
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(creator_code:org_t)
- 2021
- 2021
- Engelska.
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Ingår i: Materials Advances. - : Royal Society of Chemistry. - 2633-5409. ; 2:17, s. 5737-5751
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Abstract
Ämnesord
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- Negative thermal expansion is an elusive property found among certain materials, whose potential applications have remained limited due to the many challenges faced in their synthesis. Herein, we report the successful formation of aluminium titanate-based coatings (Al2TiO5), a material renowned for its low-to-negative thermal expansion, by the co-deposition of aluminium-isopropoxide and titanium-isopropoxide in a hot-wall chemical vapour deposition instrument. While coatings grown at 450 °C were amorphous as-deposited, a short-range order into the Al2TiO5-phase was found and analysed by using Raman spectroscopy. Upon subsequent annealing at 700 °C for 3 hours, crystalline coatings were achieved without forming any binary phases. The selective synthesis of the Al2TiO5 phase is ascribed to the precursors’ inherent chemical similarities, resulting in a kinetic targeting of this phase and a short-range homogeneity, entailing its preferred crystallisation. The role of local coordination is expressed by demonstrating the formation of intergrowth phases ascribed to lower coordinating interstices in the compound. Both the formation and crystallisation temperatures reported herein, as well as the timescales needed for the synthesises, are considerably lower than any conventional adopted solid-state techniques used so far to attain the Al2TiO5 phase.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Keramteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Ceramics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Tribologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Tribology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Nyckelord
- Al2TiO5
- CVD
- Thermal Expansion
- Kinetics
- Selective synthesis
- Oxides
- Ceramics
- Heat resistant materials
- Al2TiO5
- CVD
- Termisk expansion
- Kinetik
- Selektiv syntes
- Oxider
- Keram
- Temperaturbeständiga material
- Kemi med inriktning mot oorganisk kemi
- Chemistry with specialization in Inorganic Chemistry
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