## Glass, Volume 1 |

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Page 93

Swarts and Pressau ( 1965 ) studied the kinetics of darkening of a

europiumdoped , reduced soda - silica glass which was irradiated by 3600 - Å

light at – 155°C . At this low temperature the

investigators found ...

Swarts and Pressau ( 1965 ) studied the kinetics of darkening of a

europiumdoped , reduced soda - silica glass which was irradiated by 3600 - Å

light at – 155°C . At this low temperature the

**fading**rate was negligible . Theinvestigators found ...

Page 111

Fournier and Shaw ( 1974 ) also studied the influence of copper on darkening

level and initial

they assumed that the

Fournier and Shaw ( 1974 ) also studied the influence of copper on darkening

level and initial

**fade**rates at various ... In studying the temperature dependencethey assumed that the

**fading**allowed an nth order expression , where n was a ...Page 119

... silver halide , Eq . ( 14 ) is a satisfactory representation for some purposes . To

evaluate the

) equal to zero ; i . e . , the sample is no longer exposed to activating irradiation .

... silver halide , Eq . ( 14 ) is a satisfactory representation for some purposes . To

evaluate the

**fading**rate one simply integrates Eq . ( 8 ) after having set G ( 1 , t , q) equal to zero ; i . e . , the sample is no longer exposed to activating irradiation .

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absorption alkali annealing applied assumed atoms band birefringence bleaching bond borate glasses Bray Brillouin calculations caused Ceram charge Chem coefficient color composition concentration conductivity considered constant containing coordination copper crystal crystalline curve darkening density dependence described detailed determined dielectric diffusion discussed distribution effect electron energy equation equilibrium et al experimental fading field fluctuations frequency function given gives heat treatment hole increased indicated intensity ions levels light liquid material measured mole negative observed obtained optical oxide oxygen particles phase photochromic Phys polarization positive present probably produce properties range ratio reduced relaxation reported respectively sample scattering separation shift shown in Fig silicate glasses silver halide similar SiO2 sodium Solids spectra spectrum strain stretching structural studied Taylor techniques temperature term thermal tion transition trapped units unpublished wavelengths York