Crystals of REBa2Cu4O8 (RE = Yb, Tm, Er, Ho, Dy, and Y1-xCax) were grown at 1100°C and 600 bar of O2 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 A ̊, b ≈ 3.86 A ̊, c ≈ 27.1 A ̊, and Z = 2 As the ionic radius of the lanthanide decreased, the lattice parameters decreased. Substitution of calcium in Y1-xCaxBa2Cu4O8 crystals (x ∼ 0.02) increased Tc to 87 K.
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics