## Glass, Volume 1 |

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Page 290

The leakage current is proportional to V and is

steady - state dc ( or leakage ) conductance . The instantaneous polarization

current is

The leakage current is proportional to V and is

**given**by I = G . V where G , is thesteady - state dc ( or leakage ) conductance . The instantaneous polarization

current is

**given**by ( 18 ) 1 = Co äi ( 19 ) where Co is the geometric capacitance ...Page 314

The probability q per unit time of the defect migration is

/ kT ) ( 94 ) where va is the vibrational frequency of alkali ion and U is the energy

barrier to migration . Thus , the probability that any alkali ion transfers from one ...

The probability q per unit time of the defect migration is

**given**by q = Va exp ( – U/ kT ) ( 94 ) where va is the vibrational frequency of alkali ion and U is the energy

barrier to migration . Thus , the probability that any alkali ion transfers from one ...

Page 319

( 81U2 + uzu1 ) 1 + jot where o is the dc conductivity of the specimen and is

by O = 0102 / ( 01u2 + O2ui ) ( 122 ) and & is

( 123 ) U1 & 2 + U21 The relaxation strength ( or step height of dielectric ...

( 81U2 + uzu1 ) 1 + jot where o is the dc conductivity of the specimen and is

**given**by O = 0102 / ( 01u2 + O2ui ) ( 122 ) and & is

**given**by & 1 & 2 Em = Aε = Ts U2 to( 123 ) U1 & 2 + U21 The relaxation strength ( or step height of dielectric ...

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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