DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2011 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DF: Fachverband Dielektrische Festkörper

DF 15: Glasses and Glass Transition II (Joint Session of CPP, DY, DF)

DF 15.3: Vortrag

Donnerstag, 17. März 2011, 11:30–11:45, ZEU 114

Structural relaxation times in high-density amorphous ice (HDA) — •Philip H. Handle1, Markus Seidl1, Erwin Mayer2, and Thomas Loerting11Institute of Physical Chemistry, University of Innsbruck, Austria — 2Institute of General, Inorganic & Theoretical Chemistry, University of Innsbruck, Austria

Solid water (H2O) exists in a variety of different forms. Besides common hexagonal Ice (Ih) today 15 different crystalline and three different amorphous forms are known. It is under discussion whether the amorphous forms are glassy (related to liquid water [1]) or nano-crystalline (related to ice). In case of high-density amorphous ice (HDA) this question has been addressed in some studies [2-4], yet remains controversial. In our work we measured structural relaxation times of HDA at elevated pressures (0.1 and 0.2 GPa) and different temperatures (125-135 K) on the basis of differential scanning calorimetry (DSC) at 1 bar. Our data suggest that at 135 K the structural relaxation time is only slightly higher than 100s, i.e., HDA is on the borderline to the glass transition.

[1] Poole, P. H.; et al.; Nature 360, 324-328 (1992). [2] Tse, J. S.; et al.; Nature 400, 647-649 (1999). [3] Mishima, O.; J. Chem. Phys. 115, 4199-4202 (2001). [4] Andersson, O.; Phys. Rev. Lett. 95, 205503-205507 (2005).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2011 > Dresden