Effect of aligning graphene oxide nanoplatelets using direct current electric field on fracture behaviour of adhesives

Fracture response of adhesive joints reinforced with aligned multi-walled carbon nanotubes using an external electric field

We have prepared perovskite thin-film electroluminescence with multilayered BaTiO3/((Ca0.6Sr0.4)0.997Pr0.002)TiO3/BaTiO3, obtaining low-electric-field driving. Complete epitaxial growth of all laye...

Thin-film perovskite electroluminescence with BaTiO3 films as insulating layers

Thin films of relaxor materials, namely Pb(Sc0.5Ta0.5)O3 (PST), Pb(Sc0.5Nb0.5)O3 (PSN) and Pb(Mg1/3Nb2/3)O3 (PMN), and of Pb0.76Ca0.24TiO3 (PTC), which is a classical ferroelectric as bulk material, have been produced to examine whether nanocrystalline relaxor materials show influences in their properties if their grain size is reduced to dimensions known from their nanodomains and to investigate effects in a superlattice of nanocrystalline ferroelectric and relaxor films. At first amorphous films of the different materials were deposited onto a Ti/Pt coated Silicon (100) wafer by reactive rf-sputtering. Different grain sizes could be prepared by a controlled annealing process. The increasing size of the crystallites, the crystal structure and the pyrochlore-perovskite transformation have been investigated by profile analysis of the XRD spectra. Temperature and frequency dependent dielectric measurements show typical relaxor properties in the single layers and the existence of two maxima in the s...

Processing and properties of nanocrystalline Pb(Sc0.5 Ta0.5)O3, Pb(Sc0.5 Nb0.5)O3, Pb(Mg1/3 Nb2/3)O3 and Pb0.76Ca0.24TiO3 films and ferroelectric/ relaxor superlattices

Thin sections in the thickness range down to 3–5 μm were produced from bariumtitanate ferroelectric ceramics. The small signal dielectric constant, as well as hysteresis loops were measured. Significant deviations from the bulk properties were observed, when the thickness of the sample was decreased to the average diameter of the grains. The measured results are discussed proposing a model with internal stresses and a distorted surface layer.

H. E. Müser

Papers

Dielectric properties of thin sections of barium titanate ceramics