Ultrastability and Enhanced Stiffness of Nanoanatase <?format ?>and Eventual Pressure-Induced Disorder on the Nanometer Scale
Physical review letters, 2006•APS
At 300 K ultrafine∼ 6 nm grain-size nanoanatase retains its structural integrity up to 18 GPa.
There is progressive pressure-induced structural disorder to a highly disordered state at P>
18 GPa. Signatures of short-range order persist to well beyond 18 GPa in both the
synchrotron–x-ray diffraction and Raman data. Molecular dynamics simulations suggest
disorder initiated in the surface shell of a nanograin with crystallinity being retained in the
core. A bulk modulus B 0= 237±3 GPa for the nanoanatase (<? format?>∼<? format?> 30 …
There is progressive pressure-induced structural disorder to a highly disordered state at P>
18 GPa. Signatures of short-range order persist to well beyond 18 GPa in both the
synchrotron–x-ray diffraction and Raman data. Molecular dynamics simulations suggest
disorder initiated in the surface shell of a nanograin with crystallinity being retained in the
core. A bulk modulus B 0= 237±3 GPa for the nanoanatase (<? format?>∼<? format?> 30 …
At 300 K ultrafine grain-size nanoanatase retains its structural integrity up to 18 GPa. There is progressive pressure-induced structural disorder to a highly disordered state at . Signatures of short-range order persist to well beyond 18 GPa in both the synchrotron–x-ray diffraction and Raman data. Molecular dynamics simulations suggest disorder initiated in the surface shell of a nanograin with crystallinity being retained in the core. A bulk modulus for the nanoanatase (<?format ?>∼<?format ?>30% higher than the bulk value) is derived from the data, concordant with the MD calculations.
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