Cation Composition and Oxygen Content Dependence of Crystal Structure and Tc for Tl2-xBa2Ca2Cu3+zOy

AbstractThe crystal structure of several RBa2Cu3-yO6+z (R=Y,Ho) crystals are investigated by neutron diffraction using an exact solution for the twinned orthorhombic samples. For an oxygen concentration >0.35 in the chains, the structure is orthorhombic due to an exclusive occupancy of the 0(4) site. A systematic and variable copper deficiency is observed on the Cu(l) site leading to a correlated defect on the chain oxygen O(4) and on the bridging oxygen O(l). Due to the presence of these defects, a transverse disorder is observed for the highest oxygen content with a residual occupancy of the forbidden O(5) site.

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Dependence of crystal structure, phase transition temperature, chemical state of Fe, oxygen content and electrical conductivity of Ba2-La Fe2O5+ (x= 0.00–0.15) on La content

Solid State Ionics ◽

10.1016/j.ssi.2016.03.019 ◽

2016 ◽

Vol 290 ◽

pp. 71-76 ◽

Cited By ~ 9

Author(s):

Tsubasa Sato ◽

Takashi Okiba ◽

Katsumi Shozugawa ◽

Motoyuki Matsuo ◽

Fumito Fujishiro ◽

...

Keyword(s):

Crystal Structure ◽

Phase Transition ◽

Electrical Conductivity ◽

Transition Temperature ◽

Oxygen Content ◽

Phase Transition Temperature ◽

Chemical State ◽

Structure Phase ◽

Structure Phase Transition

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Investigate Oxygen Content in YBa2Cu3O7-δ Superconductors

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.979.124 ◽

2014 ◽

Vol 979 ◽

pp. 124-127 ◽

Cited By ~ 1

Author(s):

Thitipong Kruaehong

Keyword(s):

Crystal Structure ◽

Oxygen Content ◽

Resistivity Measurement ◽

Solid State Reaction Method ◽

Superconducting Phase ◽

X Ray Diffraction ◽

Atomic Position ◽

Reaction Method ◽

X Ray ◽

Structure Properties

The YBa2Cu3O7-δ(Y123) compounds were synthesized by solid state reaction method. The home-made four-probes apparatus was used for the resistivity measurement. The highest Tc is 91.95 K in sample C and sample A has lowest Tc onset at 89.85 K. The crystal structure properties and oxygen content were characterized by powder X-ray diffraction using CuKα radiation (λ=1.5406 Å). The Pmmm and Pnma space group corresponding on the superconducting phase and the non-superconducting phase. The atomic position of samples were consisted of various element atom. The longer time of oxygen-doping, the increase the critical temperature , superconducting phase and c lattice parameters.

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Oxygen-content dependence of crystal structure and Tc of (Nd0.675Ce0.325)2(Ba0.664Nd0.336)2Cu3.00Oy

Physica C Superconductivity ◽

10.1016/s0921-4534(99)00559-6 ◽

2000 ◽

Vol 329 (1) ◽

pp. 29-36 ◽

Cited By ~ 5

Author(s):

Yasushi Idemoto ◽

Yoshihisa Hayakawa ◽

Nobuyuki Koura ◽

James W Richardson ◽

Chun-Keung Loong

Keyword(s):

Crystal Structure ◽

Oxygen Content

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