## Proceedings of the International School of Physics "Enrico Fermi.", Volume 22N. Zanichelli, 1963 - Nuclear physics |

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Page 348

pletely through the rod, the

equal to the rod diameter. This sets a limit on the maximum diameter which can

be used. In the case of silicon, rods over 2 cm in diameter are commonly handled

...

pletely through the rod, the

**zone**length at the surface needs to be approximatelyequal to the rod diameter. This sets a limit on the maximum diameter which can

be used. In the case of silicon, rods over 2 cm in diameter are commonly handled

...

Page 362

The maximum reduction in impurity concentration, after an infinite number of

by an equation expressing the ultimate concentration as a function of distance

along ...

The maximum reduction in impurity concentration, after an infinite number of

**zone**passes (which for practical purposes may be as few as 10 or 20), is givenby an equation expressing the ultimate concentration as a function of distance

along ...

Page 363

The most generally useful means of arriving at a uniform impurity distribution is

by «

say, a pure rod. If an impurity with a small distribution coefficient is added to the ...

The most generally useful means of arriving at a uniform impurity distribution is

by «

**zone**-leveling ». Consider the problem of preparing uniform material from,say, a pure rod. If an impurity with a small distribution coefficient is added to the ...

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absorption acceptor approximation assumed band edge band structure Brillouin zone calculated carrier centre charge Chem coefficient components compound concentration conduction band consider constant corresponding crystal curves cyclotron resonance degenerate density diffusion direct transition discussed donor doping effective mass electric field energy gap energy surfaces equation equilibrium example exciton experimental expression Faraday rotation foreign atoms free electron frequency germanium given hence holes imperfections impurity indium antimonide InSb interaction interband ionization ions Journ lattice levels linear liquid magnetic field matrix measurements melt mobility momentum obtained optical p-type phonon Phys potential pressure quantum range reciprocal lattice region samples scattering semiconductors shown in Fig spherical spin spin-orbit structure elements symmetry tensor theory thermodynamic thermodynamic potentials tion transverse valence band valley Voigt effect wave functions wave vector Zeeman effect zero zone