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Size-dependent elasticity of nanocrystalline titania

Chen, Bin and Zhang, Hengzhong and Dunphy-Guzman, KA and Spagnoli, D and Kruger, MB and Muthu, DVS and Kunz, M and Fakra, Sirine and Hu, JZ and Guo, QZ and Banfield, Jillian F (2009) Size-dependent elasticity of nanocrystalline titania. In: Physical Review B, 79 (12). pp. 125406-1.


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Synchrotron-based high-pressure x-ray diffraction measurements indicate that compressibility, a fundamental materials property, can have a size-specific minimum value. The bulk modulus of nanocrystalline titania has a maximum at particle size of 15 nm. This can be explained by dislocation behavior because very high dislocation contents can be achieved when shear stress induced within nanoparticles counters the repulsion between dislocations. As particle size decreases, compression increasingly generates dislocation networks hardened by overlap of strain fields that shield intervening regions from external pressure. However, when particles become too small to sustain high dislocation concentrations, elastic stiffening declines. The compressibility has a minimum at intermediate sizes.

Item Type: Journal Article
Publication: Physical Review B
Publisher: The American Physical Society
Additional Information: Copyright of this article belongs to The American Physical Society
Keywords: compressibility;dislocations;elastic moduli;elasticity;hardening;high-pressure effects;nanoparticles; particle size;semiconductor materials;titanium compounds; X-ray diffraction
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 15 Dec 2009 05:12
Last Modified: 07 Jan 2013 06:02
URI: http://eprints.iisc.ac.in/id/eprint/19824

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