## Glass, Volume 1 |

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Page 17

The field strength of the modifier ions and therefore the bond energy between the

that

The field strength of the modifier ions and therefore the bond energy between the

**cation**and the oxygen was found to have a ... It was postulated by Dietzel ( 1949 )that

**cations**with high field strength , and therefore high polarizing power , form ...Page 35

For example in a silicate glass , the possibilities generally fall into three major

categories : ( 1 ) a network - modifying

oxygens , ( 2 ) a network - forming

For example in a silicate glass , the possibilities generally fall into three major

categories : ( 1 ) a network - modifying

**cation**position surrounded by six or moreoxygens , ( 2 ) a network - forming

**cation**position with four - fold oxygen ...Page 341

Grolls - rp ) 2 ( 171 ) where ß is the finite displacement factor , r , and ro are the

radii of

, and G is shear modulus . The first term on the right - hand side of this equation ...

Grolls - rp ) 2 ( 171 ) where ß is the finite displacement factor , r , and ro are the

radii of

**cation**and oxygen ion respectively , rp is the radius of “ doorway ” in glass, and G is shear modulus . The first term on the right - hand side of this equation ...

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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spectrum strain stretching structural studied Taylor techniques temperature term thermal tion transition trapped units unpublished wavelengths York