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Amorphization and grain size effect on milled PbTiO3 studied by Raman scattering and visible photoluminescence emission |
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| Authors: | F. Lanciotti Jr. P.S. Pizani C.E.M. Campos E.R. Leite L.P.S. Santos N.L.V. Carreño E. Longo |
| Affiliation: | Departamento de Fisica, Universidade Federal de S?o Carlos, Caixa Postal 676, 13565-905, S?o Carlos, SP, Brazil, BR CMDMC/LIEC – Departamento de Quimica, Universidade Federal de S?o Carlos, Caixa Postal 676, 13565-905, S?o Carlos, SP, Brazil, BR |
| Abstract: | Raman scattering and photoluminescence (PL) studies on milled PbTiO3 are presented in this paper. The results suggest that the visible PL emission could be related to both the localized states in the interface between the amorphous layer and the crystalline core and the amorphous layer itself. The Raman spectrum of PbTiO3 milled for a long time showed the vibrational density of states, and a detailed analysis of the soft mode allowed us to conclude that the PbTiO3 crystalline core did not experience any structural phasetransition. Received: 2 February 2001 / Accepted: 23 July 2001 / Published online: 17 October 2001 |
| Keywords: | PACS: 77.84.Dy 78.30.-j |
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