Concept

Céramique

Publications associées (425)

Authentication with built-in encryption by using moire intensity profiles between random layers

This invention discloses new methods, security devices and apparatuses for authenticating documents and valuable articles which may be applied to any support, including transparent synthetic materials and traditional opaque materials such as paper. The inv ...

2006

Effect of thick-film materials on the mechanical integrity of high-strength ceramic substrates

Peter Ryser, Thomas Maeder, Caroline Jacq, Giancarlo Corradini

Recently, high-strength zirconia-toughened alumina (ZTA) ceramic substrates have attracted interest, because they offer much improved mechanical properties over straight alumina, while maintaining advantages such as good thermal conductivity and chemical s ...

2005

MICRO-MOULDING OF CERAMIC STRUCTURES USING CERAMIC-PRECURSOR POLYMERS

Jürgen Brugger, Vahid Fakhfouri

We develop ceramic structures using ceramic-precursor polymers. The possibility to modify easily the physical properties of the final ceramic structures just by doping the precursor with nanoparticles, makes them interesting for new MEMS and NEMS developme ...

2005

Softening and hardening transitions in ferroelectric Pb(Zr,Ti)O3 ceramics

Hysteretic and nonlinear dielectric behaviour in ferroelectric ceramics has been of interest since 1950s, when these materials found application in various electronic devices. Presently, these phenomena concern with important areas of science, technology a ...

EPFL2005

The fluid dynamics of ice slurry

Didier Albert Simon Vuarnoz

A review of research work of fluid dynamics of fine-crystalline ice slurry is presented. Different rheological models which are applied are presented. Numerous models for the friction factor, obtained by empirical and semi-empirical approximation, are disc ...

Elsevier2005

Thermal degradation of proton conductors BayM1-xYxO3-delta (M = Zr, Ce)

Arnaud Magrez

We optimize the preparation of BZY20 and BCY10 by a wet chemistry route (the polyacrylamide gel process) and mixed oxide route, respectively. For both materials, the purity of powders drastically depends on the annealing conditions of the raw materials. Pu ...

2005

Synthesis and dielectric characterization of potassium niobate tantalate ceramics

Nava Setter

The preparation and dielectric properties of potassium niobate tantalate (KTN) have been investigated with the aim of exploring the material's potential for ferroelectric tunable applications. The samples were prepared both by conventional sintering in air ...

2005

Complex oxide nanostructures by pulsed laser deposition through nanostencils

Jürgen Brugger, Marc Antonius Friedrich van den Boogaart

We achieved parallel nanoscale patterning of ferroelectric complex oxides by pulsed laser deposition through a nanostencil (i.e., through a pattern of apertures in a thin free-standing membrane). Ordered arrays of nanostructured barium titanate (BaTiO3) we ...

2005

Development of low-temperature thick-film materials for piezoresistive sensors

Peter Ryser, Claudio Grimaldi, Thomas Maeder, Caroline Jacq, Sonia Vionnet Menot

Thick-film materials are very advantageous for piezoresistive pressure and force sensors because of ease of processing, reliability and low cost. However, their applications are restricted because standard thick-film materials require processing temperatur ...

2005

Piezoelectric properties of Li- and Ta-modified (K0.5Na0.5)NbO3 ceramics

Nava Setter, Dragan Damjanovic, Matthew Davis, Evelyn Hollenstein

Lead-free, potassium sodium niobate piezoelectric ceramics substituted with lithium (K0.5-x/2,Na0.5-x/2,Li-x)NbO3 or lithium and tantalum (K0.5-x/2,Na0.5-x/2,Li-x)(Nb1-y,Ta-y)O-3 have been synthesized by traditional solid state sintering. The compositions ...

2005

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