Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3042225
Keywords
arrays; electromechanical effects; ferroelectric Curie temperature; ferroelectric transitions; lead compounds; nanotubes; Raman spectra; X-ray diffraction
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Funding
- National Science Fund [50625204]
- Science Fund for Creative Research Groups [50621201]
- Ministry of Sciences and Technology of China [2009CB623301, 2006AA03Z0428]
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High-aspect ratio PbTiO3 nanotube arrays with a length of 20 mu m were synthesized by hydrothermal method. Curie temperature of the specimen (at about 620 degrees C) was found to be dispersive and much higher than PbTiO3 bulks. Ferroelectric to paraelectric phase transition in the high-aspect ratio PbTiO3 nanotube arrays was studied by Raman scattering and XRD. The nanotubular structure plays an important role in optimizing the stress distribution in the nanotube arrays. It was found that optimized two-dimensional compressive stress was responsible for the shift of Curie temperature in PbTiO3 nanotube arrays.
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