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Effect of particle size on the optical properties of lead zirconate titanate nanopowders
Author(s) -
Pakizeh Esmaeil,
Moradi Mahmood
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15792
Subject(s) - crystallite , materials science , tetragonal crystal system , lead zirconate titanate , analytical chemistry (journal) , fourier transform infrared spectroscopy , perovskite (structure) , particle size , refractive index , dielectric , spectroscopy , mineralogy , ferroelectricity , crystal structure , optics , crystallography , chemistry , optoelectronics , physics , chromatography , quantum mechanics , metallurgy
Nanopowder samples of lead zirconate titanate (Pb 1.1 Zr 0.52 Ti 0.48 O 3 or PZT ) were prepared by the sol‐gel method with controlled pH values. The samples were characterized using FTIR spectroscopy, XRD , FE ‐ SEM , and TEM techniques. Most of the peaks in the XRD pattern were related to the coexistence of tetragonal‐rhombohedral phases and confirmed the formation of PZT with a perovskite structure. Also, the crystallite size of PZT nanopowders was in a range of 17‐28 nm. FTIR spectroscopy revealed a longitudinal optical ( LO ) and transverse optical ( TO ) phonon modes corresponding to the stretching vibration of Ti‐O and Zr‐O bonds. The influence of pH values on the LO and TO phonon modes, LO ‐ TO splitting, refractive index n (ω), extinction coefficient k (ω), and the real ɛ 1 (ω) and imaginary ɛ 2 (ω) parts of dielectric function was discussed. These properties were investigated in the mid‐infrared region (450‐750 cm −1 ). The energy loss function Im[−1/(ɛ)] of PZT nanopowders was obtained by Kramers‐Kronig dispersion relations. The TO phonon frequency decreases with increasing crystallite size of the PZT samples. This effect does not happen at pH 8 to pH 9. As the crystallite size increased from 17.26 nm (at pH 5) to 27.25 nm (at pH 7), the LO ‐ TO splitting increased as well. This result showed that the optimum pH for absorption of IR radiation and optical application was at pH 7.