High-temperature relaxation mechanisms in inorganic glasses

Бартенев, Г. М.; Scheglova, N.N.

doi:10.1016/0022-3093(80)90158-1

Cited by 21 publications

(11 citation statements)

References 5 publications

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“…In fact, the local feature of the heating induced by the laser could allow the integration over the same substrate of DSC with other (optoelectronic) devices, the possibility of sintering nc‐TiO 2 films over flexible substrates (which can deform at high temperatures and over very large areas. In fact, sintering by local heating can avoid the glass bending induced by the process temperature reached in furnaces , which can make the sintering of large area glass substrates difficult. Being able to process over large areas is very desirable in terms of throughput and fabrication simplicity.…”

Section: Resultsmentioning

confidence: 99%

Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Mincuzzi

Schulz-Ruhtenberg

Vesce

et al. 2012

Progress in Photovoltaics

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We have analysed and optimised a laser process for the sintering of the TiO2 layers in dye solar cells (DSCs). Through a thermographic characterisation of the process, we show that it is possible to scale and process large areas uniformly (16 cm2). We fabricated DSCs with nanocrystalline (nc)‐TiO2 films sintered by using pulsed ultraviolet laser with an average output power P varying from 1 W to 7 W whilst mainting a constant power conversion efficiency η. The highest efficiency reached for a laser sintered DSC was 7%. The time required to sinter 1 m2 of nc‐TiO2 film was found to decrease hyperbolically with P, which is important for determining process takt times. We quantified the embodied energy (EE) required to sinter 1 m2 of the active TiO2 layer for a variety of different processes, and found that the EE for the laser sintering process with a system wall plug efficiency of 3.5% to be competitive with the more conventional oven and belt furnace treatments. We outline the main features required from a laser system to carry out an efficient, energetically favourable and industrially applicable automated process with competitive throughput. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Mincuzzi

Schulz-Ruhtenberg

Vesce

et al. 2012

Progress in Photovoltaics

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“…This property is well-studied in polymeric systems [29][30][31], where the timescales for relaxation can be on the order of minutes to hours. The phenomenon has also been studied in glass systems experimentally [32,33].…”

Section: B Viscoelastic Stress Relaxation In Silicamentioning

confidence: 99%

Cooling rate and stress relaxation in silica melts and glasses via microsecond molecular dynamics

Lane

2015

Phys. Rev. E

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We have conducted extremely long molecular dynamics (MD) simulations of glasses to microsecond times, which close the gap between experimental and atomistic simulation timescales by 2 to 3 order of magnitude. Static, thermal, and structural properties of silica glass are reported for glass cooling rates down to 5 × 10 9 K/s and viscoelastic response in silica melts and glasses are studied over 9 decades of time. We present results from relaxation of hydrostatic compressive stress in silica and show that time-temperature superposition holds in these systems for temperatures from 3500 K to 1000 K.

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“…Decreasing Young's modulus after ion exchange can be attributed to relaxation of the glass network . At temperatures below T g in alkali silicate glass, the fast R 1 and the slow R 2 relaxation processes are observed . The relaxation process R 1 is assumed to be connected with the local fluctuation deformations of the glass network as in the case of reverse glass deformation under high pressures, and the process R 2 with the mobility of microscopic areas of the glass micro‐inhomogeneous structure (structural complexes, microblocks).…”

Section: Discussionmentioning

confidence: 99%

Effects of Ion Exchange on the Mechanical Properties of Basaltic Glass Fibers

Kuzmin

Zhukovskaya

Gutnikov

et al. 2015

Int J of Appl Glass Sci

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Basaltic glass fibers with different lithium oxide (6-14 mol%) and sodium oxide (2-14 mol%) contents were prepared. The influence of Li 2 O and Na 2 O content on the process of fiber manufacturing was investigated. Addition of alkali oxides reduced the forming temperature and substantially expanded the fiber-forming temperature ranges. The obtained thermal data from differential thermal analysis revealed a decline in glass transition temperature (T g ) of fibers against the compositional changes. The inclusion of Li 2 O and Na 2 O in the glass network led to a reduction in its thermal stability. The obtained X-ray diffraction patterns and IR spectra of Li-rich and Na-rich basaltic glass fibers confirmed the formation of highly polymerized structures such as LiAl(Si 2 O 6 ) and (Na,K)(AlSiO 4 ), respectively, and relatively depolymerized silicate anions. The effects of potassium-lithium and potassium-sodium ion exchange on the mechanical properties of basaltic glass fibers were investigated. As-received Li-rich and Na-rich basaltic glass fibers were ion-exchanged in potassium nitrate for different exchange times, and their mechanical properties were measured before and after chemical tempering. The measured tensile strength and Young's modulus values of the fibers showed an increase after treatment in molten salt. * Fig. 5. Young's modulus of as-received basalt fibers, Li-rich and Na-rich basaltic glass fibers before and after ion exchange in KNO 3 salt melt at 673 K for different exchange times (t = 15, 30 and 90 min). www.ceramics.org/IJAGSIon Exchange of Basaltic Glass Fibers 125

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High-temperature relaxation mechanisms in inorganic glasses

Cited by 21 publications

References 5 publications

Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Cooling rate and stress relaxation in silica melts and glasses via microsecond molecular dynamics

Effects of Ion Exchange on the Mechanical Properties of Basaltic Glass Fibers

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High-temperature relaxation mechanisms in inorganic glasses

Cited by 21 publications

References 5 publications

Laser processing of TiO2 films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Laser processing of TiO2 films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Cooling rate and stress relaxation in silica melts and glasses via microsecond molecular dynamics

Effects of Ion Exchange on the Mechanical Properties of Basaltic Glass Fibers

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Product

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Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation

Laser processing of TiO₂ films for dye solar cells: a thermal, sintering, throughput and embodied energy investigation