Title :
Scaling effects of ferroelectric nanoparticles studied by synchrotron radiation X-ray diffraction
Author :
Kano, Jun ; Karaki, Tomoaki ; Adachi, Masatoshi ; Kojima, Seiji
Author_Institution :
Inst. of Mater. Sci., Univ. of Tsukuba, Tsukuba, Japan
Abstract :
High-resolution synchrotron X-ray powder diffraction measurement with multiple-detector system has been performed to investigate the scaling effect in ferroelectric PbxSr1-xTiO3 nanoparticles at ambient temperature with various sizes ranging from 10 to 200 nm and various compositions. The peak profiles of the 200 reflections show a large broadening and asymmetry for all particle sizes with decreasing particle size, implying the formation of gradational lattice structure induced by inhomogeneous strain. On the other hand, asymmetric and wide peak profiles of the 200 reflections become a wide symmetry with decreasing x. The crystal structure of PST at ambient temperature were indexed in a tetragonal system for x > 0.4 and in a cubic one for x ¿ 0.4. This result indicates that a tetragonal-cubic phase boundary exists around x~ 0.4.
Keywords :
X-ray diffraction; crystal structure; ferroelectric materials; ferroelectric transitions; lead compounds; nanoparticles; particle size; strontium compounds; synchrotron radiation; PbxSr1-xTiO3; crystal structure; ferroelectric nanoparticles; high-resolution synchrotron radiation X-ray powder diffraction; lattice structure; multiple-detector system; particle size; phase transitions; scaling effect; size 10 nm to 200 nm; tetragonal-cubic phase boundary; Ferroelectric materials; Nanoparticles; Performance evaluation; Powders; Reflection; Size measurement; Strontium; Synchrotron radiation; Temperature distribution; X-ray diffraction;
Conference_Titel :
Micro-NanoMechatronics and Human Science, 2009. MHS 2009. International Symposium on
Conference_Location :
Nagoya
Print_ISBN :
978-1-4244-5094-7
Electronic_ISBN :
978-1-4244-5095-4
DOI :
10.1109/MHS.2009.5352105
