Effects of a distribution of volume relaxation times in the annealing of bsc glass

Macedo, P. B.; Napolitano, Albert

doi:10.6028/jres.071a.031

Cited by 86 publications

(32 citation statements)

References 8 publications

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“…In describing the relaxation curves [1] shown in figure 2 one has to consider both (a) th~ distribution of relaxation times as lin ear i.e., nonamplltude dependent and (b) a nonlinear relaxation process i.e., at any instant there is a distribution of relaxation times but at subsequent intervals each relaxation time changes with distance from equilibrium [16].…”

Section: Spectrum Of Relaxation Timesmentioning

confidence: 99%

“…In order to circumvent this problem the crossover technique [1,2] will be used. The thermal history involved in the crossover can best ,be understood if one first understands the mathematlcal model used to re present the spectrum.…”

Section: Spectrum Of Relaxation Timesmentioning

confidence: 99%

“…If the starting point is one of equilibrium [M r However, when starting from a nonequilibrium approach curve, NI and N2 will depend on the particular approach curve being followed. Figure 4 due to Macedo and Napolitano [1] shows schematically the time dependence of N , Ml and M2 at T2 for a glass initially at equilibrium at Tr, where TI > T2 • As the I structure rearranges itself to the new equilibrium, M 1 will rise faster since it is associated with the shorter relaxation time TI; while M 2 will change more slowly. Thus, around the bend of the approach curve, there will be the largest difference between M 1 and M 2 in the glass.…”

Section: Spectrum Of Relaxation Timesmentioning

confidence: 99%

“…Because most of the data of this type are obtaine d by aco usti cal tec hniques [19], the proper thermal condition to co mpare is isochoric, adiabatic (Tvs). Unfortun ately we do not have the necessary data to perform the tra nsformation (see ref [1]), but we should expect that th e ratio of TPT/Ts to be larger than Tvs/Ts bec ause TPT/Tvs > 1 [1]. The average shear relaxation time was calculated by eq (4), usin g the C~ of Strakna e t a!.…”

Section: Comparison Of Volume and Shear Relaxation Timesmentioning

confidence: 99%

“…In a rece nt pape r [1] I a two relaxati on model was l propos ed for obtaining distribution of relaxation times from ann ealin g ex perim e nts on a boros ili cate c rown (BSC) o-lass [2]. Since thi s mod el was only a ppli ed to a BSC "'glass, and there was a remote possibility that this glass was immiscibl e, it was decid ed to apply thi s inte rpre tation to simila r annealing experim e nts perform ed on a one co mpon ent glass -Ge02.…”

Section: Introductionmentioning

confidence: 99%

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Spectrum of relaxation times in GeO2 glass

Napolitano¹,

Macedo²

1968

J. RES. NATL. BUR. STAN. SECT. A.

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Index-of· re fra ction ve rs us time iso th e rm s ha ve bee n esta bli shed for ge rmania glass. Us in g th e c rosso ve r te c hniqu e with air-q ue nc hed sampl es and app lyin g th e two relaxatio n tim e mod el pre viou s ly reported for borosilicate glass, it was found that th e width of th e spec tr~m of re laxatlO~ lim es f or "ermania «lass was te mp e rature depe nd e nt. Upo n ana lyzlI1 g thi s 111 term s of a di strIbutIOn of a c t~vatlOn ~n e rgi es, Dle res ults showed that, s il:-ularly to B20 3 , activation energies small e r than the activatIOn e ne rgy present in th e Arrhenius regio n appear at low te mperatures.Extens ive viscos ity meas ure me nts DY th e fib e r elon gation me thod we re mad e from 10" to 6 X 10 14 poi ses. Fro m thi s data a lower and more precise value of th e activation e ne rgy (E" = 72 .3 kcal/mo l) was obtained in th e annealin g ran ge.Key Word s: Activation e ne rgy ; annea lin g; german ia glass; index of refra ction ; re laxat ion tim es; th e rm al expan sion; two relaxation model ; vi scosity.

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Section: Spectrum Of Relaxation Timesmentioning

confidence: 99%

Section: Spectrum Of Relaxation Timesmentioning

confidence: 99%

Section: Spectrum Of Relaxation Timesmentioning

confidence: 99%

Section: Comparison Of Volume and Shear Relaxation Timesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spectrum of relaxation times in GeO2 glass

Napolitano¹,

Macedo²

1968

J. RES. NATL. BUR. STAN. SECT. A.

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Metallic Glasses

Cahn

2006

Materials Science and Technology

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Resistance Drift Convergence and Inversion in Amorphous Phase Change Materials

Pries

Stenz

Schäfer

et al. 2022

Adv Funct Materials

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Phase change materials (PCMs) are key to the development of artificial intelligence technologies such as high‐density memories and neuromorphic computing, thanks to their ability for multi‐level data storage through stepwise resistive encoding. Individual resistance levels are realized by adjusting the crystalline and amorphous volume fraction of the memory cell. However, the amorphous phase exhibits a drift in resistance over time that has so far hindered the commercial implementation of multi‐level storage schemes. In this study, the underlying physical process of resistance drift with the goal of modeling is elucidated that will help minimize and potentially overcome drift in PCM memory devices. Clear evidence is provided that the resistance drift is dominated by glass dynamics. Resistivity convergence and drift inversion for the amorphous chalcogenide Ge15Te85 and the PCM Ge3Sb6Te5 are experimentally demonstrated and these changes are successfully predicted with a glass dynamics model. This new insight into the resistance drift process provides tools for the development of advanced PCM devices.

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Effects of a distribution of volume relaxation times in the annealing of bsc glass

Cited by 86 publications

References 8 publications

Spectrum of relaxation times in GeO2 glass

Spectrum of relaxation times in GeO2 glass

Metallic Glasses

Resistance Drift Convergence and Inversion in Amorphous Phase Change Materials

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