American Chemical Society, Journal of Physical Chemistry C, 40(116), p. 21635-21639, 2012
DOI: 10.1021/jp3075699
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Using high-resolution, synchrotron-based powder X-ray diffraction (XRD), we have studied the high-pressure behavior of the anatase phase of nanocrystalline TiO2 (nc-TiO2) under hydrostatic conditions. We find that for anatase with a grain size larger than 40 nm, the room-pressure bulk modulus K0 remains constant at 200 GPa to within experimental uncertainties. An 15% decrease in K0 is observed for grains that are 20 nm in size and remains unchanged for grains down to 6 nm in diameter, indicating a rapid increase in compressibility for nc-TiO2 anatase between 40 and 20 nm.