| 摘要 |
1526152 Semiconductive ceramics MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 17 Jan 1977 [20 Jan 1976 28 Jan 1976 13 Feb 1976 (2) 16 March 1976 (3) 10 April 1976] 01797/77 Heading C1J A composition comprising at least two of Cu 2 0, Bi 2 O 3 , MnO 2 and Li 2 CO 3 is thermally diffused as an insulating layer in the grain boundaries in a polycrystalline ceramic semi-conductor composed mainly of SrTiO 3 . Small amounts of Nb 2 O 5 and Ta 2 O 5 may be present in the SrTi0 3 . |
