Event 

Title:
Seminars on ion accelerators - Is there low temperatures vitrous defects in glasses ...
When:
07.11.2014 - 07.11.2014
Where:
Centre for the Micro Analysis of Materials - Madrid
Category:
CMAM seminars on ion accelerators and associated techniques

Description

Speaker: Miguel Ángel Ramos, CMAM-UAM

Title: Is there low temperatures vitreous defects in glasses that are extremely stabilized?

Abstract: An important and surprising feature of all non-crystalline solids is that, regardless of its nature and composition, have a number of universal properties, sometimes called "abnormal" as opposed to better understood crystalline solids that are observable in the range of low temperatures. These properties are determined by the presence of low-energy excitations in glasses and other non-crystalline solids, in particular the so-called states of two-level tunneling and boson peak.

In this talk, I will present two recent works about calorimetry experiments at very low temperatures in two different kinds of extremely stabilized glasses: (i) amber, a glass polymerized resin that has aged naturally for 110 million years; (ii) indomethacin, prepared in thin layers by physical vapor deposition, with parameters that turn it in glasses with exceptional thermodynamic and kinetic stability. This surprising results, only apparently contradictory, offer valuable keys to understanding the ultimate nature of the universal anomalies of glasses at low temperatures.

This talk is the second part of the seminar "An informal introduction to the glass transition and glasses physics" presented by Miguel Ángel Ramos the last week.

Venue

Venue:
Centre for the Micro Analysis of Materials   -   Website
Street:
C/ Faraday, 3, Campus Cantoblanco,UAM
ZIP:
28049
City:
Madrid
Country:
Country: es

Description

Scientific seminars within Seminars cycle on ion accelerators and associated techniques which take place in the CMAM and where members of CMAM give short talks with informative character and open to all.