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

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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
Creators:
CreatorsEmailORCIDORCID Put Code
Kshetri, Yuwaraj K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kamiyama, TakashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Torii, ShukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jeong, Sang HoonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, Tae-HoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choi, HeechaeUNSPECIFIEDorcid.org/0000-0002-9390-6607UNSPECIFIED
Zhou, JunUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Feng, Yuan PingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, Soo WohnUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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
Uncontrolled Keywords:
KeywordsLanguage
UP-CONVERSION LUMINESCENCE; FLUORESCENCE INTENSITY RATIO; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; SPECTROSCOPIC PROPERTIES; EMISSION; DEPENDENCE; YTTRIUM; THERMOMETRY; TRANSITIONMultiple languages
Multidisciplinary SciencesMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/34062

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