François de Guerville

François de Guerville
International Institute for Hydrogen Materials Research | I2-HMR · .

Nanophysics - Condensed Matter Physics - Proton Conductors

About

9
Publications
1,811
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
162
Citations
Introduction
Current research interests : Interaction of Hydrogen with Silicon single crystals and with Proton Conductors. Techniques used : Raman spectroscopy, ...
Additional affiliations
August 2015 - January 2017
International Institute for Hydrogen Materials Research
International Institute for Hydrogen Materials Research
Position
  • Researcher
February 2010 - August 2012
October 2003 - September 2008
Université de Picardie Jules Verne
Position
  • PhD Student

Publications

Publications (9)
Article
Full-text available
Proton conductors (PC) are metal oxides often used as solid electrolyte with hydrogen above 400 K, in which anomalous presence increase of several chemical elements and excess heat would have been obtained from near-surface locations. Near the surface of other metal oxides, closely spaced hydrogen at a distance of only 2 pm at least during a fracti...
Article
Full-text available
Artificial superlattices (SLs) consisting of ferroelectric BaTiO3 (BT) and paraelectric BaZrO3 (BZ) have been growth by a pulsed laser deposition technique. The epitaxial BT and BZ layers with a periodicity from 16 Å to 1056 Å were sequentially deposited on (001) MgO substrate buffered with an oxide conducting layer of La1/2Sr1/2CoO3. The out-of-pl...
Article
Full-text available
In micro- and nanoscale ferroelectric samples, a formation of periodic polarization domains is the efficient mechanism of reducing depolarization field that is produced by the surface bound charges. This makes the physics of these samples different from the bulk samples. We present the results of modelling of ferroelectric domains and domain textur...
Article
Full-text available
The energetically unfavorable depolarization field produced in ferroelectric materials by the surface bound charges is screened in the macroscopic samples by either intrinsic or electrode charge carries. In the micro- and nanoscale case, however, formation of periodic polarization domains seems to be more efficient mechanism of the reducing of the...
Article
Full-text available
Platinum nanoparticles dispersed in a cholesteric liquid crystal can form periodic ribbons which mimic the well-known fingerprint texture. The distance between ribbons is directly correlated to the helical pitch and therefore to the molecular chirality. Here we show how the particles are organized in volume by transmission electron microscopy inves...
Article
Full-text available
We used pulsed laser deposition to grow a series of [BaTiO3](Lambda/2)/[BaTi0.68Zr0.32O3](Lambda/2) (BTZ/BT) superlattices (SL's) with a modulation period Lambda that varies between 16 A <=Lambda <= 1008 A; the total thickness is kept constant at about 4000 A. We determine the out-of-plane lattice parameters of the SL constituents by modeling the x...
Article
Full-text available
We have developed the set of numerical (finite-element) and analytical tools that are based on the self-consistent solution of the electrostatic equations coupled with material Ginzburg–Landau equations with an objective to model the profile of domain textures in the entire temperature region. We calculated the evolution of principal parameters of...
Article
Full-text available
Metallic nanoparticles dispersed in a cholesteric liquid crystal can order in accordance with the helical structure of the chiral phase. Since the liquid crystals we used have a glassy state, the nanostructures may be examined by transmission electron microscopy. The platinum nanoparticles form periodic ribbons which mimic the well-known fingerprin...
Article
Full-text available
Metallic nanoparticle assemblies can be organized in accordance with the helical structure of the cholesteric liquid crystalline phase. The liquid crystals used having a glassy state, the nanostructures could be examined by transmission electron microscopy. The platinum nanoparticles form periodic ribbons which mimic the well-known fingerprint chol...

Network

Cited By

Projects

Project (1)
Project
In proton conductors used as solid electrolyte in hydrogen atmosphere, high densities of nanocavities can form near the cathode. These nanocavities would contain hydrogen molecules with impurities, under pressure up to tens of GPa during the experiments. The hydrogen in the nanocavities will be studied by Raman spectroscopy.