Single-crystal growth and characterization of REBa2Cu4O8 and Y1−xCaxBa2Cu4O8

✍ Scribed by C.A. Hijar; C.L. Stern; K.R. Poeppelmeier; K. Rogacki; Z. Chen; B. Dabrowski

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 554 KB
• Volume: 252
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00462-9

✦ Synopsis

Crystals of REBa2Cu40 s

(RE = Yb, Tm, Er, Ho, Dy, and Yl-xCax)

were grown at 1100°C and 600 bar of 02 pressure in a hot isostatic press furnace. Single crystal X-ray diffraction data show that all compounds crystallized in space group Ammm (#65) with the approximate lattice parameters a ~-3.82 ,~, b = 3.86 ,~, c --27.l A, and Z= 2. As the ionic radius of the lanthanide decreased, the lattice parameters decreased. Substitution of calcium in Yt_xCaxBa2Cu408 crystals (x ~ 0.02) increased T~ to 87 K.