New systems glass-metal and ceramics-metal

Solomin, N. V.

doi:10.1007/bf00688359

Cited by 4 publications

(5 citation statements)

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“…Therefore, considering both the correlation function for the Ti-bearing glass obtained from xray diffraction and the RMC model, we do not see evidence for the aggregation of Ti atoms into Ti-rich areas in the Ti-COR glass. This phase separation between a Ti-rich zone and an Si-rich zone is usually believed to be responsible for the homogeneous crystallization of Ti-bearing alumino-silicate glasses [2,46].…”

Section: Medium-range Order Around Titanium Atomsmentioning

confidence: 98%

“…The nucleation process is often improved by the addition of nucleating agents in glasses, which promote bulk nucleation and increase nucleation kinetics. Titanium is considered as one of the most efficient nucleating agents for the production of silicate glass-ceramics [2]. However, the titanium structural environment in glass compositions relevant to industrial applications and its influence on the overall glass 5 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Environment of titanium and aluminum in a magnesium alumino-silicate glass

Guignard

Cormier

Montouillout

et al. 2009

J. Phys.: Condens. Matter

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The structure of the glass 2MgO-2Al 2 O 3 -5SiO 2 -TiO 2 was investigated using neutron diffraction with isotopic substitution. Reverse Monte Carlo (RMC) modeling was used to reproduce experimental structure factors derived from diffraction experiments. The local environment of titanium atoms was determined and it corresponds to an average of 5.4 ± 0.2 oxygen atoms at a mean distance of 1.86 ± 0.02Å. This coordination number agrees with the predominance of fivefold coordination, with the coexistence of four-and sixfold coordination in similar amounts. 27 Al nuclear magnetic resonance (NMR) results revealed that the proportion of highly coordinated aluminum atoms in this titanium-bearing glass was higher than in the titanium-free sample. RMC modeling was used to interpret the structural role of these [5] Al species and we show a trend for preferential bonding between [5] Al and Ti atoms. This favored linkage is important to understand the role of titanium dioxide as a nucleating agent in inorganic glass-ceramics fabrication.

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Section: Medium-range Order Around Titanium Atomsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Environment of titanium and aluminum in a magnesium alumino-silicate glass

Guignard

Cormier

Montouillout

et al. 2009

J. Phys.: Condens. Matter

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“…The precipitation of the cristobalite in the initially amorphous glass mixture is discouraging because of its large thermal expansion coefficient (50 ppm • C −1 ), and the volume change associated with its marternsitic transformation from tetragonal to the cubic phase at about 150-200 dramatically reduces the thermal shock resistance and the mechanical strength of the borosilicate glass. To get an improved estimate of σ Thermal , an average value of thermal expansion coefficient of 27 ppm of SiO 2 cristobalite is used instead of 50 ppm [15]. It gives a thermal stress value of 4 GPa which is much higher than the compressive yield strength of silicon 120 MPa [16] and tensile strength 90 MPa of Duran glass [17].…”

Section: Bond Strength Analysismentioning

confidence: 99%

Fusion-bonded fluidic interconnects

Fazal¹,

Elwenspoek²

2008

J. Micromech. Microeng.

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A new approach to realize fluidic interconnects based on the fusion bonding of glass tubes with silicon is presented. Fusion bond strength analyses have been carried out. Experiments with plain silicon wafers and coated with silicon oxide and silicon nitride are performed. The obtained results are discussed in terms of the homogeneity and strength of fusion bond. High pressure testing shows that the bond strength is large enough for most applications of fluidic interconnects. The bond strength for 525 µm thick silicon, with glass tubes having an outer diameter of 6 mm and with a wall thickness of 2 mm, is more than 60 bars after annealing at a temperature of 800 • C.

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“…The precipitation of colloidal silver within the glass without any hydrogen treatment arises owing to photoreduction of silver ions. It is believed that some impurity ions such as Fe 2+ present in the glass act as the sensitizer for such a reaction to take place (McMillan 1964). In figure 4 is shown the histogram of silver particles as obtained from figure 3(a).…”

Section: The Origin Of the Different Lifetimesmentioning

confidence: 99%

Investigation of silver - glass nanocomposites by positron lifetime spectroscopy

Mukherjee

Nambissan

Chakravorty

1996

J. Phys.: Condens. Matter

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Nanocrystalline silver particles were grown in a glass medium by ion-exchange and reduction techniques and studied by positron lifetime spectroscopy. The particle sizes varied from 5 to about 25 nm as observed by transmission electron microscopy. The positron lifetime spectra of all the samples could be decomposed into three components having lifetimes of around 160 ps, 400 ps and 1500 ps. The first is ascribed to positron annihilation at the interfaces of the nanocrystalline silver and the glass matrix, and it decreases and stabilizes as the silver grain size increases. The second component is explained as arising from positrons trapped and annihilated at the free-volume defects in the glass matrix. The third component arises because of the annihilation of orthopositronium at large free-volume defects. The effects of temperature on the interfacial defects and the processes leading to the formation of additional positron trapping centres are discussed.

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New systems glass-metal and ceramics-metal

Cited by 4 publications

References 0 publications

Environment of titanium and aluminum in a magnesium alumino-silicate glass

Environment of titanium and aluminum in a magnesium alumino-silicate glass

Fusion-bonded fluidic interconnects

Investigation of silver - glass nanocomposites by positron lifetime spectroscopy

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