Anomalous elastic and dielectric behavior in nanocrystalline Ca-modified lead titanate (PTC) films

摘要: Thin amorphous PTC-films of 1 μm thickness were produced by rf-sputtering at room temperature. A subsequent annealing process enabled us to prepare different grain sizes which have been characterised x-ray powder diffraction. At the transition from nanocrystalline state elastic modulus c 11 measured HR-Brillouin spectroscopy exhibited a surprising instability. The dielectric constant showed not only expected increase with increasing size but also significant relaxor behavior.