title: Raman scattering study of Ca-modified lead titanate.
abstract: The paraelectric to ferroelectric phase transitions were studied by Raman scattering in Ca-doped lead titanate ceramics. The soft optic modes responsible for the ferroelectric phase transitions were clearly observed. The A(1)(1TO) mode, which softens toward T(c), contains four subpeaks. The frequencies of these subpeaks depend to a great extent on the Ca content and the temperature. These behaviors are discussed on the basis of the anharmonicity of lattice vibrations.
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba,Tsukuba, Ibaraki, 305-8573, Japan.
authors.forename: Kihiro
authors.initials: K
authors.lastname: Kato
authors.forename: Shinya
authors.initials: S
authors.lastname: Tsukada
authors.forename: Jun
authors.initials: J
authors.lastname: Kano
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Seiji
authors.initials: S
authors.lastname: Kojima
mesh_terms: D002118:Calcium / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008027:Light; D008422:Materials Testing; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: C481719:lead titanate; D007854:Lead; D014025:Titanium; D002118:Calcium