Synthesis using molten KOH and properties of rare earth substituted REBa2Cu4O8 phases

Rare-earth-substituted REBa2Cu4O8 phases (RE124) are synthesized by using molten KOH to investigate phase formation and superconductivity. RE124 phases with small and heavy rare-earth elements of Yb, Er, Ho, Dy, Gd and Y are easily producible with good superconducting properties and crystallinity. Superconducting transition temperature and superconducting volume fraction decrease with increasing ion radius of the rare-earth elements. Samples using large rare-earth elements show broad peaks of RE124 pattern in x-ray diffraction also with broad peaks probably originating from RE123 and other related phases.

[1]  C. Lin,et al.  Investigation of YBa2Cu4O8 single crystal growth by KOH flux , 2008 .

[2]  C. Lin,et al.  Ambient-condition growth of superconducting YBa2Cu4O8 single crystals using KOH flux , 2007 .

[3]  I. Yamaguchi,et al.  Solid-state epitaxy of c-axis-oriented Yb124 films prepared by coating-pyrolysis process , 1998 .

[4]  Tatsumi Masakazu,et al.  Synthesis of bulk superconductors RBa2Cu4O8 (R = Tm, Er, Ho, Y, Dy and Gd) by a simple solid-state reaction method , 1996 .

[5]  A. Stacy,et al.  Precipitation of superconducting, single phase EuBa2Cu4O8 from molten hydroxide at 475 °C , 1995 .

[6]  T. Morishita,et al.  In situ preparation of Y1Ba2Cu4O8 thin films by the laser ablation technique , 1994 .

[7]  S. Tanaka,et al.  Growth of YBa2Cu4O8 thin films by metal-organic chemical vapor deposition , 1994 .

[8]  H. Adachi,et al.  Synthesis of LnBa2Cu4O8 (Ln=rare earth elements) ceramics at one atmosphere oxygen pressure , 1991 .

[9]  H. Hayashi,et al.  Growth Mechanism of YBa2Cu4O8(124) Phase in Metalorganic Chemical Vapor Deposition Film , 1991 .

[10]  H. Hayashi,et al.  The 124 Phase in Y-Ba-Cu-O Films Fabricated by Metalorganic Chemical Vapor Deposition , 1991 .

[11]  Y. Shiohara,et al.  Phase Diagram of YBa2Cu3O7-x, Y2Ba4Cu7O15-x and YBa2Cu4O8 Superconductors , 1990 .

[12]  Shoji Tanaka,et al.  Formation of Ca-doped YBa2Cu4O8 phase in thin films , 1990 .

[13]  T. Wada,et al.  Phase Stability and Decomposition of Superconductive (Y1-xCax)Ba2Cu4O8 (0≦x≦0.1) , 1990 .

[14]  J. Nickel,et al.  Conversion of 124 into 123+CuO and 124, 123 and 247 phase regions in the Y- Ba-Cu-O system , 1990 .

[15]  Buckley,et al.  Bulk superconducting Y2Ba4Cu7O15- delta and YBa2Cu4O8 prepared in oxygen at 1 atm. , 1990, Physical review. B, Condensed matter.

[16]  S. Tanaka,et al.  Tc increased to 90 K in YBa2Cu408 by Ca doping , 1989, Nature.

[17]  Scott,et al.  Eight new high-temperature superconductors with the 1:2:4 structure. , 1989, Physical review. B, Condensed matter.

[18]  W. F. Peck,et al.  Synthesis of bulk superconducting YBa2Cu4O8 at one atmosphere oxygen pressure , 1989, Nature.

[19]  J. Karpinski,et al.  Bulk synthesis of the 81-K superconductor YBa2Cu4O8 at high oxygen pressure , 1988, Nature.

[20]  Hong,et al.  Superconducting properties of a 27-A , 1988, Physical review. B, Condensed matter.

[21]  Lee,et al.  Properties of Y-Ba-Cu-O thin films with ordered defect structure: Y2Ba4Cu8O20-x. , 1988, Physical review. B, Condensed matter.

[22]  Barton,et al.  Ordered-defect structure in epitaxial YBa2Cu3O7-x thin films. , 1988, Physical review. B, Condensed matter.

[23]  R. Gronsky,et al.  Structure of (CuO)2 double layers in superconducting YBa2Cu3O7 , 1988, Nature.

[24]  R. Gronsky,et al.  SURFACE DECOMPOSITION OF SUPERCONDUCTING YBa2Cu3O7 , 1988 .