Concept

Spectroscopie diélectrique

Publications associées (200)

Effect of Uniaxial Compressive Stress on Dielectric and Piezoelectric Responses in Lead Zirconate Titanate Based Ceramics

A uniaxial compressive stress significantly modifies the dielectric and piezoelectric response of Pb(Zr,Ti)O3 (PZT)-based piezoceramics. In soft PZT, the pre-stress decreases both the piezoelectric coefficient and its increment with increasing dynamical st ...

2012

Energy transfer and relaxation mechanisms in Cytochrome c

Majed Chergui, Frank van Mourik, Andrea Cannizzo, Cristina Consani

Using broadband UV-vis femtosecond transient absorption and fluorescence up-conversion, we investigate the interaction between the haem moiety of ferric and ferrous Horse heart Cytochrome c and its single Tryptophan (Trp) residue and the energy dissipation ...

Elsevier2012

Broadband Dielectric Response in Hard and Soft PZT

Li Jin

Lead zirconate titanate (Pb(Zr1-xTix)O3 or PZT) ferroelectric ceramics have been widely used in transducers, actuators, and sensors, since they posses high dielectric and piezoelectric properties with a relatively high temperature of operation. Commerciall ...

EPFL2011

Capturing EELS in the reciprocal space

Cécile Hébert, Audrius Alkauskas

In this work two aspects of momentum-dependent electron energy loss spectrometry are studied, both in the core-loss and in the low-loss region. In the case of core losses, we focus on the demonstration and the interpretation of an unexpected non-Lorentzian ...

2011

Structural Determinants of the Sign of the Pyroelectric Effect in Quasi-Amorphous SrTiO3 Films

Alexander Tagantsev

The magnitude and direction of the permanent electric polarization in the non-crystalline, polar phase (termed quasi-amorphous) of SrTiO3 in Si\SiO2\Me\SrTiO3\Me, (Me = Cr or W), Si\SrRuO3\SrTiO3, and Si\SrTiO3 layered structures were investigated. Three p ...

Wiley-Blackwell2011

Inhibition of the Emission of Electromagnetic Modes of Photonic Crystal Cavities with a Top Mirror

Romuald Houdré, Nicolas Le Thomas

By imaging the angular spectrum of optical modes confined within subwavelength volumes, we investigate the impact of metallic and dielectric surrounding layers on the optical emission properties of planar silicon photonic crystal cavity. By scanning a mirr ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Ionic partition diagram of tetraphenylporphyrin at the water|1,2-dichloroethane interface

Hubert Girault, Manuel Alejandro Méndez Agudelo, Bin Su, Raheleh Partovi Nia, Zdenek Samec

diagram of 5,10,15,20-tetraphenyl-21H,23H-porphine (H2TPP) at the water|1,2-dichloroethane interface using a simple Born solvation model. This zone diagram shows under which form this porphyrin is present, i.e. neutral, monoprotonated or diprotonated, and ...

Elsevier2011

A unified approach to dielectric single cell analysis: Impedance and dielectrophoretic force spectroscopy

Philippe Renaud, Thomas Michael Braschler, Ana Valero

In this review we present a unified approach for single cell dielectric spectroscopy. Impedance spectroscopy and dielectrophoretic cell sorting, current microtechnologies applied in electrical analysis of single cells are discussed based on their closely r ...

Royal Society of Chemistry2010

Lattice dynamics and dielectric response of undoped, soft and hard PbZr0.42Ti0.58O3

Dragan Damjanovic, Li Jin, Viktor Porokhonskyy

In this study, ceramic samples of lead zirconate titanate Pb(Zr0.42Ti0.58)O3 (PZT 42/58) doped with Fe (hard) and Nb (soft) were studied by Raman, infrared (IR) and THz spectroscopy in the temperature range from 900 to 20 K. From the evaluation of the IR a ...

Taylor & Francis2010

High Breakdown Field Dielectric Elastomer Actuators Using Encapsulated Polyaniline as High Dielectric Constant Filler

Martin Molberg

A novel method allowing rapid production of reliable composites with increased dielectric constant and high dielectric strength for dielectric elastomer actuators (DEA) is reported. The promising approach using composites of conductive particles and insula ...

Wiley-Blackwell2010

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