Author/Authors :
Swamy، نويسنده , , Varghese and Dubrovinsky، نويسنده , , Leonid S. and Dubrovinskaia، نويسنده , , Natalia A. and Langenhorst، نويسنده , , Falko and Simionovici، نويسنده , , Alexandre S. and Drakopoulos، نويسنده , , Michael and Dmitriev، نويسنده , , Vladimir and Weber، نويسنده , , Hans-Peter، نويسنده ,
Abstract :
High-pressure structural transitions in nanocrystalline systems are of significant interest as models of first-order phase transitions. We demonstrate size-induced lattice expansion and significant atomic rearrangements in the crystal structure of nanocrystalline high-pressure baddeleyite-TiO2. The α-PbO2 structured TiO2 recovered after dozens of pressure cycles in the α-PbO2-baddeleyite pressure field displayed elongate 25–35 nm crystallites, compared to starting 34-nm anatase crystallites, suggesting crystallite coherency across anatase, baddeleyite, and α-PbO2 structures and ‘single structural domain’ behavior of the nanocrystalline system.
