Synthesis and characterization of (Bi,Cu)Sr2(RE,Ca)Cu2Oz (RE: Y or rare-earth element)

✍ Scribed by Toshihiko Maeda; Tairiku Tashiro; Shigeru Horii

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 453 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2010.01.013

✦ Synopsis

Samples with nominal compositions of x = 0-0.1 in (Bi (1+3x)/3 Cu (2À3x)/3 )Sr 2 (RE 1Àx Ca x )Cu 2 O z ((Bi,Cu)-''1-2-1-2"; RE: Y or rare-earth element) were synthesized by a solid-state reaction method and characterized by means of X-ray diffractometry (XRD). It is confirmed that the (Bi,Cu)-''1-2-1-2" forms only when RE = Y, Dy and Ho. Single-or nearly single-phase samples are obtained for x = 0-0.05 and the Ca-free composition of this compound is determined to be (Bi 1/3 Cu 2/3 )Sr 2 RECu 2 O z . Since ionic radii of Y, Dy and Ho are very close to each other and this seems to be an essential factor for the stability of the (Bi,Cu)-''1-2-1-2".