scholarly journals Absolutely necessary to consider the caged dynamics and the JGX β-relaxation in solving the glass transition problem

2019 ◽  
Vol 22 (4) ◽  
pp. 43605
Author(s):  
Ngai ◽  
Capaccioli ◽  
Wang
Keyword(s):  
Glass Transition ◽  
Transition Problem ◽  
Β Relaxation

β relaxation at the glass transition of hard-spherical colloids

1991 ◽  
Vol 43 (10) ◽  
pp. 5442-5448 ◽  
Author(s):  
W. Götze ◽  
L. Sjögren
Keyword(s):  
Glass Transition ◽  
Β Relaxation

scholarly journals Dynamic Mechanical Relaxation in LaCe-Based Metallic Glasses: Influence of the Chemical Composition

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1013 ◽  
Author(s):  
Minna Liu ◽  
Jichao Qiao ◽  
Qi Hao ◽  
Yinghong Chen ◽  
Yao Yao ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Metallic Glasses ◽  
Physical Aging ◽  
Enthalpy Of Mixing ◽  
Mechanical Analysis ◽  
Mechanical Relaxation ◽  
Atomic Mobility ◽  
Dynamic Mechanical ◽  
Β Relaxation

The mechanical relaxation behavior of the (La0.5Ce0.5)65Al10(CoxCu1−x)25 at% (x = 0, 0.2, 0.4, 0.6, and 0.8) metallic glasses was probed by dynamic mechanical analysis. The intensity of the secondary β relaxation increases along with the Co/Cu ratio, as has been reported in metallic glasses where the enthalpy of mixing for all pairs of atoms is negative. Furthermore, the intensity of the secondary β relaxation decreases after physical aging below the glass transition temperature, which is probably due to the reduction of the atomic mobility induced by physical aging.

scholarly journals Pharmaceutical Amorphous Organic Materials Characterization by Using the Differential Scanning Calorimetry and Dynamic Mechanical Analysis

2011 ◽  
Vol 6 (2) ◽  
pp. 91-95
Author(s):  
Ion Dranca ◽  
Igor Povar ◽  
Tudor Lupascu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Relaxation Processes ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Β Relaxation

This research has been carried out in order to demonstrate the use of differential scanning calorimetry (DSC) in detecting and measuring α- and β-relaxation processes in amorphous pharmaceutical systems. DSC has been employed to study amorphous samples of poly (vinylpyrrolidone) (PVP), indomethacin (InM), and ursodeoxycholic acid (UDA) that are annealed at temperature (Ta) around 0.8 of their glass transition temperature (Tg). Dynamic mechanical analysis (DMA) is used to measure β- relaxation in PVP. Yet, the DSC has been used to study the glassy indomethacin aged at 0 and -10 oC for periods of time up to 109 and 210 days respectively. The results demonstrate the emergence of a small melting peak of the α-polymorph after aging for 69 days at 0°C and for 147 days at -10°C (i.e., ~55°C below the glass transition temperature) that provides evidence of nucleation occurring in the temperature region of the β-relaxation.

scholarly journals β relaxation of nonpolymeric liquids close to the glass transition

2000 ◽  
Vol 62 (3) ◽  
pp. 4435-4438 ◽  
Author(s):  
Niels Boye Olsen ◽  
Tage Christensen ◽  
Jeppe C. Dyre
Keyword(s):  
Glass Transition ◽  
Β Relaxation
Sign in / Sign up

Export Citation Format

Share Document