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Issue 17, 2012
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Compressibility and structural stability of nanoparticulate goethite

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Abstract

Synchrotron high-pressure X-ray diffraction was used to study the compressibility and structural stability of synthetic 17 nm nanoparticulate goethite at pressures up to ∼30 GPa. The lattice parameters and the unit cell volume were determined. We observed much higher contraction along c than a and b (Pnma space group), which we attribute to relatively weak hydrogen bonding along the c axis. In the hydrostatic pressure regime (pressures up to ∼10 GPa) the bulk modulus, K0, of 17 nm goethite was determined to be 109.4 ± 2.2 GPa. The compressibility of the 17 nm goethite is comparable to that of the bulk goethite. Amorphization of the nano-goethite began at ∼17 GPa, an effect not observed in bulk goethite, even at much higher pressures. The findings indicate that for 17 nm particles, the size-dependence of goethite compressibility is small at low to moderate pressures, but at very high pressure, surface effects on nanoparticle structure become very significant.

Graphical abstract: Compressibility and structural stability of nanoparticulate goethite

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Publication details

The article was received on 07 Feb 2012, accepted on 16 May 2012 and first published on 21 May 2012


Article type: Paper
DOI: 10.1039/C2RA20217D
Citation: RSC Adv., 2012,2, 6768-6772

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    Compressibility and structural stability of nanoparticulate goethite

    S. Fernando, M. Baynes, B. Chen, J. F. Banfield and H. Zhang, RSC Adv., 2012, 2, 6768
    DOI: 10.1039/C2RA20217D

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