## Glass, Volume 17 |

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Results 1-3 of 26

Page 37

This model then yields the expression D = UkT/h)d2l(eu - e"")3/(eu' - g^')2] exp( -

Q/R T) (47) Do where d is the distance between sites, Q the

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

This model then yields the expression D = UkT/h)d2l(eu - e"")3/(eu' - g^')2] exp( -

Q/R T) (47) Do where d is the distance between sites, Q the

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

Page 86

derivative of the free energy of mixing with respect to composition. ... molecules)

in glass per unit volume, A0 a constant, AG* the critical

nucleus formation given by AG* = W/(A0v)2 (ID and A£d is the

of ...

derivative of the free energy of mixing with respect to composition. ... molecules)

in glass per unit volume, A0 a constant, AG* the critical

**activation energy**for anucleus formation given by AG* = W/(A0v)2 (ID and A£d is the

**activation energy**of ...

Page 337

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

expression where £ is an

discrete

assumed, the ...

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

expression where £ is an

**activation energy**, and k Boltzmann's constant. If adiscrete

**activation energy**were to be involved and first-order kinetics wereassumed, the ...

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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 | |

15 other sections not shown

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### Common terms and phrases

activation energy addition alkali borate glasses alkali ions alkali silicate glasses annealing atom band behavior borate boron borosilicate glass cation Ceram Chem chemical durability components concentration crystallization curve decrease defect centers devitrifiable solder glasses Doremus doublet effect ESR spectra eucryptite experimental free energy fused silica glass surface glass systems glasses containing grinding Griscom heat treatment helium hole center hole trapped hydrogen hydronium hyperfine immiscibility immiscibility boundary increase indentation irradiation lapping hardness layer material measured mole nonbridging oxygens nucleation observed optical absorption oxide glasses oxygen particle phase separation Phys polishing grains polishing rate powder properties radiation radiation-induced reaction relationship samples Section Shelby shown in Fig silicate glasses sodium sodium silicate softening point solder glass composites solubility solution specimen spectrum spinodal decomposition structure studies Table Takamori thermal expansion coefficient tion Tomozawa U.S. Patent viscosity vitreous silica vitreous solder glass