Give explanations for the following observations.
(a) Raising the temperature of a sample of a-Fe from 298 K to I200K (at 1 bar pressure) results in a change of coordination number of each Fe atom from 8 to 12.
(b) Although a non-metal, graphite is often used as an electrode material
(c) The semiconducting properties of silicon are improved by adding minute amounts of boron.
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