Michael Shandalov
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Michael Shandalov has a total of 1 co-authors. Here are the top co-authors by number of shared publications:
Paul C. McIntyre
Stanford University Department of Materials Science and Engineering Stanford, California 94305, USA
1 shared publication
Latest Publications
- 15 October 2009
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 106 (8) , 084322
Size-dependent polymorphism in HfO2 nanotubes and nanoscale thin films
Many metal oxides exhibit size-dependent phase transitions among multiple polymorphs. In this work, the microstructure and crystallinity of ultrathin HfO2 films and utrathin-wall nanotubes were investigated by high-resolution electron microscopy and electron diffraction after high-temperature annealing. Nanotubes were formed by atomic layer deposition of HfO2 on epitaxial Ge ⟨111⟩ nanowire arrays on Si (111) substrates followed by selective etching of the Ge wires. A size-dependent phase transition sequence from amorphous (a-HfO2) to tetragonal (t-HfO2) and from tetragonal to monoclinic (m-HfO2) phase was observed with increasing film and nanotube wall thickness. These results are analyzed in light of recent predictions of surface energy-driven phase transitions in nanoscale fluorite-structure oxides.
- 15 October 2009
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 106 (8) , 084322
Size-dependent polymorphism in HfO2 nanotubes and nanoscale thin films
Many metal oxides exhibit size-dependent phase transitions among multiple polymorphs. In this work, the microstructure and crystallinity of ultrathin HfO2 films and utrathin-wall nanotubes were investigated by high-resolution electron microscopy and electron diffraction after high-temperature annealing. Nanotubes were formed by atomic layer deposition of HfO2 on epitaxial Ge ⟨111⟩ nanowire arrays on Si (111) substrates followed by selective etching of the Ge wires. A size-dependent phase transition sequence from amorphous (a-HfO2) to tetragonal (t-HfO2) and from tetragonal to monoclinic (m-HfO2) phase was observed with increasing film and nanotube wall thickness. These results are analyzed in light of recent predictions of surface energy-driven phase transitions in nanoscale fluorite-structure oxides.