Crystalline and vitreous silica films and their interconversion

Información del proyecto

CRYVISIL

Identificador del acuerdo de subvención: 669179

DOI

10.3030/669179

Proyecto cerrado

Fecha de la firma de la CE 10 Julio 2015

Fecha de inicio 1 Enero 2016

Fecha de finalización 30 Junio 2022

Financiado con arreglo a

• EXCELLENT SCIENCE - European Research Council (ERC)

Coste total

€ 2 484 375,00

Aportación de la UE

€ 2 484 375,00

Coordinado por

MAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV
Germany

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

Período documentado: 2020-07-01 hasta 2022-06-30

Resumen del contexto y de los objetivos generales del proyecto

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).

Trabajo realizado desde el comienzo del proyecto hasta el final del período abarcado por el informe y los principales resultados hasta la fecha

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.

Avances que van más allá del estado de la técnica e impacto potencial esperado (incluida la repercusión socioeconómica y las implicaciones sociales más amplias del proyecto hasta la fecha)

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