In an N+1 protection scheme for a router in a data or telecommunications network, a processor-based protection unit has a replica device handle, corresponding to each of the N working units, stored in the protection unit’s local memory. The ingot is grown generally in accordance with the Czochralski method; however, the manner by which the ingot is cooled from the temperature of solidification to a temperature which is in excess of about 900 C. The invention also relates to a composition comprising the derivative and its use.