Structural and electrical characterization of lead metaniobate thin films deposited by pulsed laser ablation

• Autor(a) principal: Cardoso, F.
• Data de Publicação: 2006
• Outros Autores: Almeida, B. G., Caldelas, P., Mendes, J. A., Barbosa, J.
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/1822/85654
• topic: Dielectric properties; Lead metaniobate; Structural properties; Ciências Naturais::Ciências Físicas; Science & Technology

Lead niobate thin films have been prepared by laser ablation, at different substrate temperatures (Tdep) and with different oxygen pressures (pO2). For low deposition temperatures the films presented a rhombohedric-PbNb2O6 structural phase, with hysteresis cycles characteristic of a paraelectric. As Tdep increased the films started to develop an orthorhombic- PbNb2O6 structure that appeared at 400ºC and remained up to 600ºC. For low pO2, a mixture of this phase and a lead deficient phase was present in the films. Increasing the oxygen pressure the lead deficient phase was strongly reduced and the films presented only the ferroelectric orthorhombic- PbNb2O6 structural phase.