Title :
Raman Scattering Study of Ca Modified Lead Titanate
Author :
Kato, K. ; Tsukada, S. ; Kano, J. ; Yamamoto, T. ; Kojima, S.
Author_Institution :
Univ. of Tsukuba, Tsukuba
Abstract :
We have studied structural and vibrational properties of Ca-doped lead titanate ceramics. The vibrational soft modes associated with the ferroelectric phase transition have been observed. A1(lTO) mode, which is one of the soft modes, has four subpeaks due to anharmonicity. Composition and temperature dependences of subpeak frequencies of the A1(ITO) mode behaves as expected from theoretical calculation. Some subpeaks remain above the Curie temperature. This is attributed to the point detects and the internal strain.
Keywords :
Raman spectra; anharmonic lattice modes; calcium; crystal structure; doping; ferroelectric Curie temperature; ferroelectric ceramics; ferroelectric transitions; internal stresses; lead compounds; soft modes; Curie temperature; PbTiO3:Ca; Raman Scattering Study; anharmonicity; crystal structure; ferroelectric phase transition; internal strain; lead titanate ceramics; structural properties; vibrational soft modes; Capacitive sensors; Ceramics; Dielectric measurements; Ferroelectric materials; Frequency; Lead; Raman scattering; Spectroscopy; Temperature dependence; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on
Conference_Location :
Nara
Print_ISBN :
978-1-4244-1334-8
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2007.4393243
