Related Experiment Video
Updated: May 30, 2026
08:00
Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
A gradational system for ferroelectric nanosized (Pb(0.7)Sr(0.3))TiO(3) particles
Fumihito Shikanai1, Jun Kano, Hiroshi Sawa
1Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan.
Summary
Ferroelectric nanosized particles exhibit size-dependent structural changes. Surface effects cause gradational systems, leading to anomalous peak profiles in synchrotron radiation x-ray diffraction.
Area of Science:
- Materials Science
- Solid State Physics
- Crystallography
Background:
- Ferroelectric materials exhibit spontaneous electric polarization.
- Nanostructured ferroelectrics show unique size-dependent properties.
- Understanding structural changes in ferroelectric nanoparticles is crucial for device applications.
Purpose of the Study:
- Investigate the size effect on the crystal structure of ferroelectric (Pb(0.7)Sr(0.3))TiO(3) nanoparticles.
- Analyze peak profile broadening and asymmetry in x-ray diffraction data.
- Determine the origin of observed structural anomalies in nanosized ferroelectrics.
Main Methods:
- Synchrotron radiation x-ray diffraction (SRXRD) was employed.
- Measurements were performed on (Pb(0.7)Sr(0.3))TiO(3) particles with sizes from 10 to 200 nm.
- Low energy SRXRD was used to separate 200 and 002 Bragg reflections.
Main Results:
- Observed significant peak broadening and asymmetry in 002 reflections for all particle sizes.
- Noted that peak anomalies intensified for reflections with a large l-value.
- Found a gradual decrease in the c/a lattice constant ratio and anion-cation distances near particle surfaces.
Conclusions:
- The observed asymmetrical peak profiles are attributed to a gradational system within the nanoparticles.
- Surface effects significantly influence the crystal structure and diffraction behavior of ferroelectric nanoparticles.
- These findings provide insights into the structural characteristics of nanomaterials.
