Kshetri, Yuwaraj K., Kamiyama, Takashi, Torii, Shuki, Jeong, Sang Hoon, Kim, Tae-Ho, Choi, Heechae ORCID: 0000-0002-9390-6607, Zhou, Jun, Feng, Yuan Ping and Lee, Soo Wohn (2020). Electronic structure, thermodynamic stability and high-temperature sensing properties of Er-alpha-SiAlON ceramics. Sci Rep, 10 (1). BERLIN: NATURE RESEARCH. ISSN 2045-2322
Full text not available from this repository.Abstract
alpha-SiAlON ceramics have been in use as engineering ceramics in the most arduous industrial environments such as molten metal handling, cutting tools, gas turbine engines, extrusion molds, thermocouple sheaths, protective cover for high-temperature sensors, etc., owing to their outstanding mechanical, thermal and chemical stability. Taking advantage of the intrinsic properties of alpha-SiAlONs, we investigate, in this paper, the possibility of using the Er-doped alpha-SiAlON (Er-alpha-SiAlON) ceramic as a high-temperature sensing material via its unique near-infrared to visible upconversion property. We first use neutron diffraction and density functional theory calculations to study the electronic structure and thermodynamic stability of Er-alpha-SiAlON. It is found that the interstitial doping of Er stabilizes the alpha-SiAlON structure via chemical bonds with O-atoms with N:O ratio of 5:2 in the seven-fold coordination sites of the Er3+ ion. Temperature-dependent upconversion emissions are then studied under 980 and 793 nm excitations over a temperature range of 298-1373 K and the fluorescence intensity ratio (FIR) technique has been employed to investigate the temperature sensing behavior. Temperature-dependent Raman behavior is also investigated. We demonstrate that using Er-alpha-SiAlON as a sensing material, the limit of temperature measurement via the FIR technique can be pushed well beyond 1200 K.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-340629 | ||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1038/s41598-020-61105-z | ||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Sci Rep | ||||||||||||||||||||||||||||||||||||||||
Volume: | 10 | ||||||||||||||||||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||||||||||||||||||
Date: | 2020 | ||||||||||||||||||||||||||||||||||||||||
Publisher: | NATURE RESEARCH | ||||||||||||||||||||||||||||||||||||||||
Place of Publication: | BERLIN | ||||||||||||||||||||||||||||||||||||||||
ISSN: | 2045-2322 | ||||||||||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||||||||||
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URI: | http://kups.ub.uni-koeln.de/id/eprint/34062 |
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