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Thermal mismatch strain induced disorder of Y<inf>2</inf>Mo<inf>3</inf>O<inf>12</inf> and its effect on thermal expansion of Y<inf>2</inf>Mo<inf>3</inf>O<inf>12</inf>/Al composites

Zhou, C and Zhang, Q and Liu, S and Luo, B and Yi, E and Tian, E and Li, G and Li, L and Wu, G (2017) Thermal mismatch strain induced disorder of Y<inf>2</inf>Mo<inf>3</inf>O<inf>12</inf> and its effect on thermal expansion of Y<inf>2</inf>Mo<inf>3</inf>O<inf>12</inf>/Al composites. Physical Chemistry Chemical Physics, 19. pp. 11778-11785. ISSN 1463-9076

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Abstract

Fully dense Y Mo O /Al composites were prepared by squeeze-casting. Relatively mild conditions of 750 °C/20 min/50 MPa were used in order to avoid reaction of the components. SEM, Raman spectroscopy, XRD and dilatometry were used to characterize the microstructures and morphologies of the composites. Zero thermal expansion was achieved in the temperature range where the thermal mismatch strain was zero. We show that the CTE mismatch of Al and Y Mo O results in compressive and tensile strains that distort the Y Mo O lattice. We establish a novel method to measure the negative thermal expansion (NTE) materials' CTE under strain by measuring the composites' CTE and calculating the thermal mismatch strain between the NTE ceramic and the metal matrix. The relationship between thermal strain and Raman shift is established and measured and the simulated results are in good agreement. We also find Y Mo O to have a positive CTE when the surface strain is ≥0.80 × 10 %. 2 3 12 2 3 12 2 3 12 2 3 12 -2

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 26 Feb 2021 23:44
Last Modified: 15 Apr 2021 06:17
DOI: 10.1039/c7cp00676d