A spherically shaped piece of silicon is cut and polished from a Czochralski single crystal ingot and oxidized in a thermal oxidation furnace. Upon pulling the silicon sphere from the furnace, the color is observed to vary significantly over the surface. Why?

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter1: Atomic Structure
Section: Chapter Questions
Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?
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A spherically shaped piece of silicon is cut and polished from a Czochralski single crystal 
ingot and oxidized in a thermal oxidation furnace. Upon pulling the silicon sphere from the 
furnace, the color is observed to vary significantly over the surface. Why?

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