Preparation and optical, nanomechanical, negative thermal expansion properties of Sc2W3O12 thin film grown by pulsed laser deposition
CERAMICS INTERNATIONAL(2016)
Abstract
Negative thermal expansion Sc2W3O12 thin films have been grown on silicon and quartz substrates by pulsed laser deposition (PLD). The effects of oxygen pressure, substrate temperature and annealing temperature on the morphologies and phase composition of the Sc2W3O12 thin films were systematically investigated using X-ray diffraction (XRD), atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The negative thermal expansion, optical and nanomechanical properties of the Sc2W3O12 thin films were characterized by high temperature X-ray diffraction, spectrophotometry and nanoindentation. The results indicate as-deposited Sc2W3O12 thin films to be amorphous. Orthorhombic Sc2W3O12 thin films were observed to form by heating at 1000 degrees C for 7 min in air. The Sc2W3O12 thin film deposited at 500 degrees C under an oxygen pressure of 20 Pa has the lowest root mean square (RMS) roughness value. Meanwhile it also shows the optimum optical performance with an average transmission of over 85%. The Young's modulus (E) of the Sc2W3O12 thin film is 153.40 GPa and the hardness (H) is 8.62 GPa. The orthorhombic Sc2W3O12 thin film exhibits an anisotropic negative thermal expansion with an average linear thermal expansion coefficient was calculated to be -3.0 x 10(-6) K-1 in the temperature range from 25 degrees C to 600 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
MoreTranslated text
Key words
Negative thermal expansion,Scandium tungstate,Thin film,Pulsed laser deposition
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined