Identification of Pb-doped Bi-Sr-Ca-Cu-O superconducting phases by convergent beam electron diffraction

Fung, K. K.; Yang, C. Y.; Yan, Y. F.
July 1989
Applied Physics Letters;7/17/1989, Vol. 55 Issue 3, p280
Academic Journal
Pb-doped Bi[sub 2] Sr[sub 2] Ca[sub 2] Cu[sub 3] O[sub 10] (2223) and Bi[sub 2] Sr[sub 2] Ca[sub 3] Cu[sub 4] O[sub 12] (2234) superconducting phases have been identified by convergent beam electron diffraction. The c parameters of the 2223 and 2234 phases are 37.6 and 44 Ã…, respectively. The two phases trove the same symmetry; their common point group is mmm. Both phases are modulated, but the modulations are different from and considerably weaker than that in the unleaded Bi[sub 2] Sr[sub 2] CaCu[sub 2]O[sub 8]. This work confirms for the first time the existence of the 2234 phase.


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