Abstract
Surface structure of BaTiO3 (BTO) films grown on SrTiO3 substrates was investigated as a function of temperature. X-ray reflectivity results show that there exists a low-density surface layer of 15Å due to surface relaxation on top of the BTO films in addition to a physical adsorbed water layer of about 5Å at 25°C. The water layer disappeared at 70°C; however, the surface layer remains its thickness until 115°C. At 140°C, the thickness of the surface layer decreases to 12Å and the electron density increases to a value near to that of the underneath BTO layer. The results of differential scanning calorimetry and the temperature dependence measurement of the lattice parameters convinced that the ferroelectric phase transition of the BTO films takes place around 135°C (∼130°C for bulk BTO). This indicates that the ferroelectric phase transition would contribute to the structural change of the surface layer due to the removal of the depolarization field. Our results indicate that the ferroelectric polarization strongly influences the surface structure of BTO films.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
