## Glass, Volume 17 |

### From inside the book

Results 1-3 of 27

Page 20

This effect is almost entirely due to the large effect of molecular species on the

primarily due to the size of the molecule . He has shown that the square root of

the ...

This effect is almost entirely due to the large effect of molecular species on the

**activation**energy for diffusion . Doremus ( 1973 ) has suggested that this effect isprimarily due to the size of the molecule . He has shown that the square root of

the ...

Page 37

exp ( - Q / RT ) ( 47 ) Do where d is the distance between sites , Q the

energy for diffusion , u = hv / 2kT ( v is the vibration frequency in a solubility site ) ,

and u * = hvo / kT ( v * is the vibrational frequency in the doorway between ...

exp ( - Q / RT ) ( 47 ) Do where d is the distance between sites , Q the

**activation**energy for diffusion , u = hv / 2kT ( v is the vibration frequency in a solubility site ) ,

and u * = hvo / kT ( v * is the vibrational frequency in the doorway between ...

Page 337

In general , the rate constant v ( T ) is assumed to be given by the Arrhenius

expression v ( T ) = voe - E / kT ( 12 ) where E is an

Boltzmann ' s constant . If a discrete

first - order ...

In general , the rate constant v ( T ) is assumed to be given by the Arrhenius

expression v ( T ) = voe - E / kT ( 12 ) where E is an

**activation**energy , and kBoltzmann ' s constant . If a discrete

**activation**energy were to be involved andfirst - order ...

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### Contents

Solubility Models | 9 |

Effect of Experimental Variables on Gas Mobility in Vitreous Materials | 16 |

Phase Separation and Crystallization | 26 |

Copyright | |

14 other sections not shown

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### Common terms and phrases

absorption activation addition alkali amount appears atom band borate calculated Ceram chemical coefficient components composition concentration constant containing crystallization curve decrease defect defect centers dependence described determined devitrifiable solder glasses diffusion discussed durability effect electron energy et al example experimental Figure function given glass composites grains grinding Griscom growth hardness heat helium hole immiscibility increase indentation intensity ions irradiation lapping layer lead loss lower material measured mechanism observed obtained optical oxide oxygen particle Patent phase phase separation Phys polishing rate properties radiation range reaction relationship removal reported samples sealing Shelby shown in Fig shows silica silicate glasses similar SiO2 sodium softening point solder glass solubility solution spectra spectrum structure studies suggested surface Table temperature thermal expansion tion trapped treatment various viscosity vitreous volume yield