NEW HIGH-T(C) CUPRATE (TL1-XCRX)(SR2-YBAY)CA2CU3O9

A new series of 1223-type (T1,Cr)-based cuprates, (T1,Cr)(Sr,Ba)2Ca2Cu 3Oz, have been successfully synthesized and identified by powder x-ray diffraction and electron diffraction analyses. Ba partial substitutio n for Sr promotes the formation of (T1,Cr)-based 1223-type compounds. Nominal samples, (Tl1-xCrx)-(Sr2-yBay) Ca2Cu3Oz, with 0.15 less-than-o r-equal-to x less-than-or-equal-to 0.50 and 0.50 less-than-or-equal-to y less-than-or-equal-to 1.50 are pure or nearly pure 1223 phase and e xhibit T(c)(rho=0) in the range of 104-114 K. This new (Tl,Cr)-based h igh-T(c) material may be of importance in practical applications.