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| Naji, M. |
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Capaccioli, Simone
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Topics
Publications (53/53 displayed)
- 2024Reduction of mechanical losses in ion-beam sputtered tantalum oxide thin films via partial crystallizationcitations
- 2024Reduction of mechanical losses in ion-beam sputtered tantalum oxide thin films via partial crystallizationcitations
- 20243D Printed Piezoelectric BaTiO3/Polyhydroxybutyrate Nanocomposite Scaffolds for Bone Tissue Engineeringcitations
- 2023Synthesis and Characterization of Core–Double-Shell-Structured PVDF-grafted-BaTiO3/P(VDF-co-HFP) Nanocomposite Filmscitations
- 2023Synthesis and Characterization of Core-Double-Shell-Structured PVDF-grafted BaTiO3/P(VDF-co-HFP) Nanocomposite Filmscitations
- 2023Dielectric Characterization of Core-Shell Structured Poly(vinylidene fluoride)-grafted-BaTiO3 Nanocompositescitations
- 2022Local Piezoelectric Response of Polymer/Ceramic Nanocomposite Fiberscitations
- 2018High-pressure cell for simultaneous dielectric and neutron spectroscopycitations
- 2017Thermodynamic Scaling of the Dynamics of a Strongly Hydrogen-Bonded Glass-Formercitations
- 2016A perspective on experimental findings and theoretical explanations of novel dynamics at free surface and in freestanding thin films of polystyrenecitations
- 2016Surface diffusion of polymer glasses reduxcitations
- 2016Complex Dynamics of a Fluorinated Vinylidene Cyanide Copolymer Highlighted by Dielectric Relaxation Spectroscopycitations
- 2016Molecular relaxations in amorphous phenylbutazone
- 2015Coupling of Caged Molecule Dynamics to JG β-Relaxation III: Van der Waals Glassescitations
- 2015Extended model for the interaction of dielectric thin films with an electrostatic force microscope probecitations
- 2015Coupling of Caged Molecule Dynamics to JG β-Relaxation: Icitations
- 2015Relaxation dynamics of amorphous dibucaine using dielectric studies
- 2015Irreversibly Adsorbed Layer in Supported Ultrathin Polymer Film Investigated by Local Dielectric Spectroscopycitations
- 2015Revealing the rich dynamics of glass-forming systems by modification of composition and change of thermodynamic conditionscitations
- 2014Origins of the two simultaneous mechanisms causing glass transition temperature reductions in high molecular weight freestanding polymer filmscitations
- 2013Change of caged dynamics at T-g in hydrated proteins: Trend of mean squared displacements after correcting for the methyl-group rotation contributioncitations
- 2013Unified explanation of the anomalous dynamic properties of highly asymmetric polymer blendscitations
- 2013An explanation of the differences in diffusivity of the components of the metallic glass Pd43Cu27Ni10P20citations
- 2013Nature of the water specific relaxation in hydrated proteins and aqueous mixturescitations
- 2013The Viscoelastic Behavior of Rubber and Dynamics of Blends - The Science and Technology of Rubbercitations
- 2012Evidence of Coexistence of Change of Caged Dynamics at Tg and the Dynamic Transition at Td in Solvated Proteinscitations
- 2012Ultrathin Polymer Films: Interfacial and Annealing Dependence of Confinement Effects
- 2012Interfacial and Annealing Effects on Primary a-Relaxation of Ultrathin Polymer Films Investigated at Nanoscalecitations
- 2012Mechanism of fast surface self-diffusion of an organic glasscitations
- 2011Resolving the controversy on the glass transition temperature of water?citations
- 2011Resolving the controversy on the glass transition temperature of water?citations
- 2011Effect of Confinement on Structural Relaxation in Ultrathin Polymer Films Investigated by Local Dielectric Spectroscopycitations
- 2010Local dielectric spectroscopy of nanocomposite materials interfacescitations
- 2010Resolution of problems in soft matter dynamics by combining calorimetry and other spectroscopiescitations
- 2010Enhanced crystallization kinetics in poly(ethylene terephthalate) thin films evidenced by infrared spectroscopycitations
- 2009Glass Transitions in Aqueous Solutions of Protein (Bovine Serum Albumin)citations
- 2008Relationship between structural and secondary relaxation in glass formers: Ratio between glass transition temperature and activation energycitations
- 2008The protein "glass" transition and the role of the solventcitations
- 2008The component dynamics of miscible binary mixtures of glass formers: New featurescitations
- 2007Polarization fluctuations in an epoxy system above and below the glass transition
- 2007Effect of chain length on fragility and thermodynamic scaling of the local segmental dynamics in poly(methylmethacrylate)citations
- 2007Relaxation dynamics in tert-butylpyridine/tristyrene mixture investigated by broadband dielectric spectroscopy.citations
- 2006Dielectric secondary relaxations in polypropylene glycolscitations
- 2006Polarization fluctuations near the glass transitioncitations
- 2004Inter-chain and intra-chain hopping transport in conducting polymerscitations
- 2004Relation between the activation energy of the Johari-Goldstein beta relaxation and T(g) of glass formerscitations
- 2003Correlation between configurational entropy and structural relaxation time in glass-forming liquidscitations
- 2002Two crossover regions in the dynamics of glass forming epoxy resinscitations
- 2002Influence of the end groups on dynamics of propylene glycol oligomers studied by wideband dielectric spectroscopycitations
- 2001Study of the relaxation behavior of a tri-epoxy compound in the supercoolde and glassy state by broadband dielectric spectroscopycitations
- 2001Dielectric Analysis of the Linear Polymerization of an Epoxy Resincitations
- 2001Pressure dependence of structural relaxation times in terms of the Adam-Gibbs modelcitations
- 2000Characterization of electrochemically synthesized alkylpyrrole intrinsically conducting polymers
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article
Reduction of mechanical losses in ion-beam sputtered tantalum oxide thin films via partial crystallization
Abstract
International audience ; This study explores the impact of crystalline fraction on the mechanical losses of amorphous tantalum oxide (tantala, Ta$_{2}$O$_{5}$) thin films intended for gravitational wave detectors. We use ion beam sputtering technique to prepare a series of samples, which are then subjected to controlled thermal annealing to achieve varying degrees of crystallized fraction. The microscopic structure of the annealed samples is characterized by combining different analytical techniques. Our investigation reveals that the amorphous films comprise randomly distributed crystalline grains, whose density and average size depends on the duration of thermal treatment. To assess mechanical losses of the coatings, a gentle nodal suspension system is applied. Remarkably, a substantial reduction of approximately 20% in the coating’s mechanical loss angle with respect to annealed amorphous coatings is observed for samples exhibiting a crystalline fraction of around 5%. This improvement may lead to the definition of alternative thermal treatments to improve the mechanical performances of coatings for gravitational wave detectors or other highly sensitive optical experiments. However the reduction in mechanical losses comes at the expense of an increase in optical scattering. The possibility of reducing the optical losses to the level required by gravitational interferometers by modifying the grain size distribution via appropriate annealing treatments is discussed.