Dielectric properties of Pb0.5Ca0.5TiO3 thin films

6 pages, 9 figures.A dielectric study is carried out on chemical solution-deposited calcium lead titanate (Pb,Ca)TiO3 thin films, with calcium contents of 50 at. %, by measuring capacitance versus voltage as a function of temperature. A moderate ferroelectric activity is observed that remains in a broad temperature range, and that depends on the applied voltage and thickness of the films. This behavior is associated with the built-in fields generated as result of the space charge inside the films. From the diffusivity of dielectric constant versus temperature (K′−T) curves, the relaxorlike nature of the films is also demonstrated. The feasibility of these films for fabrication of voltage tuneable capacitors and charge store devices (dynamic random access memories) is confirmed.This work has been supported by the Spanish Project No. MAT2001-1564. One of the authors (R.J.) recognizes the support of Ramon y Cajal contract of the Ministerio de Educación y Ciencia.Peer reviewe