Temperature Dependence of the Elastic Moduli and Internal Friction of Silica and Glass

1953 ◽  
Vol 24 (1) ◽  
pp. 81-87 ◽  
Author(s):  
J. W. Marx ◽  
J. M. Sivertsen
Keyword(s):  
Internal Friction ◽  
Temperature Dependence ◽  
Elastic Moduli

Mechanical Spectroscopy Study on the Light Soaking Effect on Hydrogenated Amorphous Silicon

2012 ◽  
Vol 184 ◽  
pp. 416-421 ◽  
Author(s):  
H. Mizubayashi ◽  
I. Sakata ◽  
H. Tanimoto
Keyword(s):  
Internal Friction ◽  
Temperature Dependence ◽  
Amorphous Silicon ◽  
Hydrogenated Amorphous Silicon ◽  
Wide Distribution ◽  
Activation Energies ◽  
Mechanical Spectroscopy ◽  
Induced Changes ◽  
Mild Temperature ◽  
Hydrogenated Amorphous

For hydrogenated amorphous silicon (a-Si:H) films deposited at temperatures between 423 K and 623 K (a-Si:H423Kand so on), the light-induced changes in the internal friction between 80 K and 400 K were studied. The internal friction is associated with H2motion in microvoid networks, and shows the mild temperature dependence between about 80 K and 300 K (Q-180-300K) and the almost linear increase above 300 K (Q-1>300K). BothQ-180-300KandQ-1>300Kdecrease with increasing the deposition temperature, and show the mild temperature dependence ina-Si:H623K. The white light soaking with 100 mW/cm2(WLS100and so on) below 300 K caused a change inQ-180-300Kand no changes inQ-1>300K, respectively, and the light-induced changes inQ-180-300Krecovered after annealing at 423 K. The wide distribution of activation energies for H2motions between microvoids indicate that most of neighboring microvoids are connected through windows, i.e., the microvoid networks are existing ina-Si:H, and the spatially loose or solid structures are responsible for the low or high activation energies for the H2motion between microvoids, respectively. Furthermore, the light-induced hydrogen evolution (LIHE) was observed for WLS200to WLS400in a vacuum between 400 and 500 K, resulting in the disappearance of the internal friction due to the H2motion in the microvoid network.

Frequency and temperature dependence of elastic moduli of polymers

1986 ◽  
Vol 59 (12) ◽  
pp. 4017-4031 ◽  
Author(s):  
N. Lagakos ◽  
J. Jarzynski ◽  
J. H. Cole ◽  
J. A. Bucaro
Keyword(s):  
Temperature Dependence ◽  
Elastic Moduli

scholarly journals Внутреннее трение на границах зерен, содержащих протяженные поры

2019 ◽  
Vol 45 (3) ◽  
pp. 23
Author(s):  
В.Г. Кульков ◽  
А.А. Сыщиков
Keyword(s):  
Shear Stress ◽  
Internal Friction ◽  
Grain Boundary ◽  
Temperature Dependence ◽  
Variable Shear ◽  
Scattered Energy ◽  
Cylindrical Pores ◽  
Mutual Displacement

AbstractA model of internal friction at a grain boundary containing equidistant parallel cylindrical pores is presented. Variable shear stress induces a mutual displacement of the interfacial regions matched at the segments between pores depending on their position. The values of scattered energy at each segment and total internal friction are determined. The temperature dependence of the internal friction has a form of a wide peak.

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