Crystalline and vitreous silica films and their interconversion

Informations projet

CRYVISIL

N° de convention de subvention: 669179

DOI

10.3030/669179

Projet clôturé

Date de signature de la CE 10 Juillet 2015

Date de début 1 Janvier 2016

Date de fin 30 Juin 2022

Financé au titre de

• EXCELLENT SCIENCE - European Research Council (ERC)

Coût total

€ 2 484 375,00

Contribution de l’UE

€ 2 484 375,00

Coordonné par

MAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV
Germany

Periodic Reporting for period 4 - CRYVISIL (Crystalline and vitreous silica films and their interconversion)

Période du rapport: 2020-07-01 au 2022-06-30

Résumé du contexte et des objectifs généraux du projet

Amorphous materials are omnipresent in our everyday life. The glass formation and the crystal-glass transition at the atomic level are still open fields in research. Clarifying the mechanisms at the atomic level during glass formation is crucial for a fundamental understanding of glasses and amorphous materials in general. In this project, surface science techniques are used for following dynamic processes in silica thin films. For this purpose, we are developing a high-speed scanning tunneling microscope (STM), which can access a wide temperature range. The work is implemented by other studies on existing experimental setups, such as low energy electron microscopy (LEEM) and spectroscopy (PEEM).

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

In the first reporting period, experimental equipment was designed, installed and tested. We developed software for automated characterization of surface structures. Currently, we implement an automated device control system and new concepts of effective high speed scanning. This will guarantee high frame rates, which are required in order to monitor dynamic processes at the atomic scale in real space.
In parallel, we presented a new polymorph of the 2D silica film. This may allow for important insights into growth modes and transformations of 2D silica films as a model system for the study of glass transitions. In order to broaden the focus we also spent some time on further amorphous oxide film systems. We presented the growth and microscopic characterization of 2D germania films and obtained a comprehensive image of the germania film structure. In addition using the low energy electron microscopy (LEEM) and spectroscopy (PEEM) instrument, the temperature range for the glass formation and apparent activation energies have been explored.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

The previous studies are the basis for monitoring dynamic processes at the atomic scale in oxide network structures as a function of temperature and time well beyond the state of the art.

Overview of structural properties of the investigated silica film supported on a metal including the