Journal ArticleDOI
Phase formation and superconductivity in REBaSrCu3−x(PO4)xOy (0 ≤ x ≤ 0.3)
TLDR
Oxy-anion substituted phases of the composition REBaSrCu 2.8 (PO 4 3− ) 0.2 O y have been synthesized as discussed by the authors, and single phase formation is achieved only for the larger rare earths (La → Ho and Y) and all the phases crystallize in the tetragonal 123 structure.Abstract:
Oxy-anion (PO 4 3− ) substituted phases of the composition REBaSrCu 2.8 (PO 4 ) 0.2 O y have been synthesized. Single phase formation is achieved only for the larger rare earths (La → Ho and Y) and all the phases crystallize in the tetragonal 123 structure. IR studies confirm the presence of a phosphate group in the structure. The total oxygen content (including that associated with the oxy-anion PO 4 3− ) has been found to be in the range 7.01 to 7.10 per formula unit. Except for RE = La, Nd, Yb and Lu, all the phases exhibit superconductivity and the T c,zero values vary from 18 to 38 K. The T c,zero increases with decreasing size of RE 3+ . ErBaSrCu 3 O 7 is multiphasic and single phase formation is achieved for the first time by phosphate substitution at the copper site. Single phase formation is encountered for x = 0.10 and 0.15 with T c,zero values of 54 and 37 K respectively.read more
Citations
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Book ChapterDOI
Chapter 190 Phase diagrams and thermodynamic properties
Pavel Karen,Arne Kjekshus +1 more
TL;DR: In this paper, the phase diagrams and thermodynamic data for selected cuprates of alkaline-earth (A) and rare earth (R) elements except Sc, along with the binary to quintenary oxides, and relevant solid-solution series with other elements.
Journal ArticleDOI
Synthesis, structure and superconductivity of [Y0.75Ca0.25]SrBaCu3−x(PO4)xOy with 0.0⩽x⩽0.30
J.C. Gonzalez Gonzalez,J. Albino Aguiar,S. Quezado,L.M. Dezanetie,C.W. Chu,A. Bustamante Domínguez +5 more
TL;DR: In this article, the authors presented X-ray and magnetization results for the compound [Y0.75Ca0.25]SrBaCu3−x(PO4)xOy with 0.30 synthesized at normal pressure and temperature.
Journal ArticleDOI
Superconductivity and magnetism in the system [Y1−xCax]SrBaCu2.80(PO4)0.20Oy with 0.10≤x≤0.40
TL;DR: In this paper, the composite [Y 1−x Ca x ]SrBaCu 2.80 (PO 4 ) 0.20 O y (0.10≤x≤0.40) was presented at normal temperature and pressure conditions.
Reference EntryDOI
Phosphates: Solid-State Chemistry
TL;DR: The most common anion is the orthophosphate group PO4 3 −, which is found in many solid phosphates, including hydrated and acid phosphate salts as mentioned in this paper.
Journal ArticleDOI
Electrical and magnetic properties of Nd3+-substituted GdBaSrCu3O7 superconductor
TL;DR: In this article, the electrical resistivity and magnetic properties of GdBaSr 1− x Nd x Cu 3 O y (where x ǫ = 0, 0.1, 0.2 and 0.3) were studied by powder X-ray diffraction and SEM analysis and the optimal sintering temperature of the compounds was found to be 950°C.
References
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Journal ArticleDOI
Copper oxide superconductors containing sulphate and phosphate groups
TL;DR: In this paper, the incorporation of sulphate and phosphate groups into the YBa 2 Cu 3 O 7−δ structure, to form materials such as YSr 2 Cu 2.
Journal ArticleDOI
The structure of the non-superconducting phase La 3 Ba 3 Cu 6 O 14+x and its relation to the high- T c superconductor YBa 2 Cu 3 O 7–δ
William I. F. David,W. T. A. Harrison,Richard M. Ibberson,Mark T. Weller,J R Grasmeder,P.C. Lanchester +5 more
TL;DR: In this paper, the authors reported time-of-flight neutron powder diffraction results which confirm that the structure of La3Ba3Cu6O14+x is isomorphous with the tetragonal variant of YBa2Cu3O7−δ; in particular, the copper coordination and calculated valencies of both compounds agree closely.
Journal ArticleDOI
Introduction of nitrate groups in the “123” structure: The 82 K superconductor YCaBa4Cu5(NO3)0.3(CO3)0.7O11
TL;DR: In this paper, the introduction of nitrate groups in the 123-type matrix has been performed for the first time, and a new superconductor, YCaBa4Cu5(NO3)0.7O11 with a Tc onset of 82 K and a Meissner volume fraction of 15% at 4.2 K has been synthesized.
Journal ArticleDOI
BO3-3 substitutions in phases related to YBa2Cu3O7. superconducting properties of (Y, Ca) (Ba, Sr)2Cu3−z(BO3)zOy
Peter R. Slater,Colin Greaves +1 more
TL;DR: In this paper, the effects of partially replacing Cu by borate anions in the system YSr 2 − x Ba x Cu 3− z (BO 3 ) z O y (YSr 2− x Ba X Cu 3 − z B z O 7−δ ) have been examined.
Journal ArticleDOI
High-pressure synthesis of perovskite-derived compounds in the Sr-Y-Cu-O system
TL;DR: In this paper, perovskite-derived compounds were found in the Sr-Y-Cu-O system treated at 1.6 GPa and the stabilities of the new compounds depended highly on oxygen pressure.