Electronic structure, thermodynamic stability and high-temperature sensing properties of Er-α-SiAlON ceramics.

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ID: 102754
2020
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Abstract
α-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 α-SiAlONs, we investigate, in this paper, the possibility of using the Er-doped α-SiAlON (Er-α-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-α-SiAlON. It is found that the interstitial doping of Er stabilizes the α-SiAlON structure via chemical bonds with O-atoms with N:O ratio of 5:2 in the seven-fold coordination sites of the Er 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-α-SiAlON as a sensing material, the limit of temperature measurement via the FIR technique can be pushed well beyond 1200 K.
Reference Key
kshetri2020electronicscientific Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Kshetri, Yuwaraj K;Kamiyama, Takashi;Torii, Shuki;Jeong, Sang Hoon;Kim, Tae-Ho;Choi, Heechae;Zhou, Jun;Feng, Yuan Ping;Lee, Soo Wohn;
Journal Scientific reports
Year 2020
DOI
10.1038/s41598-020-61105-z
URL
Keywords
quantitative analysis infrared thermography descriptive statistics moisture thermal images subtraction thermal index

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