PITTSBURGH, Oct. 26 -- II-VI Inc. has acquired, via an asset purchase agreement, the Litton Systems Inc. Silicon Carbide (SiC) Group. Terms of the transaction were not disclosed. The acquired group will remain in New Jersey to continue its research and development of SiC. The company said the efforts of this newly acquired group will complement its existing SiC research and development activities, which have been ongoing since 1998.