634 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1956 



lithium — also used for local charge density in Poisson's 



equation — also used for density of diffusing positive ions in 



relaxation 

 Po resistivity of gallium-doped germanium before saturation 



with lithium . J 



Pi n/e I 



a conductivity during relaxation | 



a^ conductivity in relaxed state 



S conductance between probe points 



So conductance before diffusion begins in diffusion experiments; 



S„ conductance after diffusion is over in diffusion experiments 



T relaxation time 



$ constant in relaxation formula for conductivity 



"^ local electrostatic potential in ionic atmosphere 



w proportionality constant connecting conductance between 



probe points with integral over carrier concentration 



CO; number of states in jih. level of electronic energy diagram 



ion pairing equilibrium constant 



D vacant lattice site in covalent crystal 



n~ negatively charged cation vacancy 



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