Infrared and Raman spectroscopy of [Pb(Zn.sub.1/3./sub.Nb.sub.2/3./sub.)O.sub.3./sub.].sub.0.92./sub.-[PbTiO.sub.3./sub.].sub.0.08./sub. and [Pb(Mg.sub.13./sub.Nb.sub.2/3./sub.)O.sub.3./sub.].sub.0.71./sub.-[PbTiO.sub.3./sub.].sub.0.29./sub.single crystals

0134162 - FZU-D 20030054 RIV US eng J - Článek v odborném periodiku
Kamba, Stanislav - Buixaderas, Elena - Petzelt, Jan - Fousek, Jan - Nosek, J. - Bridenbaugh, P.
Infrared and Raman spectroscopy of [Pb(Zn_1/3Nb_2/3)O₃]_0.92-[PbTiO₃]_0.08 and [Pb(Mg₁₃Nb_2/3)O₃]_0.71-[PbTiO₃]_0.29single crystals.
Journal of Applied Physics. Roč. 93, č. 2 (2003), s. 933-939. ISSN 0021-8979. E-ISSN 1089-7550
Grant CEP: GA ČR GA202/01/0612; GA ČR GA202/00/1198; GA AV ČR IAA1010213
Výzkumný záměr: CEZ:AV0Z1010914
Klíčová slova: relaxor ferroelectrics * infrared spectroscopy * phonons * polar nanoclusters
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.171, rok: 2003

The low-frequency dielectric anomaly in the paraelectric phase is caused by contribution of dynamic polar nanoclusters with the main dispersion in the microwave range. Infrared and Raman spectra confirm the locally doubled unit cell.The lowest-frequency transverse optical (TO₁) phonon mode active in the infrared spectra is underdamped in contrast to the recent result of inelastic neutron scattering.
Trvalý link: http://hdl.handle.net/11104/0032086