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
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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
Oxyanion derivatives of cuprate superconductors superconducting 123 phosphates
TL;DR: In this article, a stable tetragonat derivative of the formula $YBaSrCu{2.8} (PO_4)_{0.2}O_y (T_c\approx47 K) was obtained by partial substitution of Y by Ca.
Journal ArticleDOI
Structure and properties of oxyanion derivatives of 123 cuprate superconductors: Effect of substitution of carbonate and nitrate ions in the Cu(1) position of YBaSrCu3O7−δ
TL;DR: In this paper, the carbonate and carbonato-nitrate derivatives were shown to coordinate strongly and are not present as free ions in these oxyanion cuprate derivatives, but the structure remains the same but superconductivity is retained.
Journal ArticleDOI
Strong rare-earth size dependence of Tc in RSr2Cu2.85Re0.15Oz.
M. Murugesan,M. S. Ramachandra Rao,L. C. Gupta,Reynaldo D. Pinto,Madhuri Sharon,R. Vijayaraghavan +5 more
TL;DR: A strong correlation is observed between the superconducting transition temperature and the orthorhombicity of the structure, which itself is R-size dependent.
Journal ArticleDOI
Stabilization of a superconducting TbSr2Cu2.85Re0.15O7+δ compound and the valence state of terbium
M. Murugesan,P. Selvam,Maheshwar Sharon,Manohar Rao,L. C. Gupta,R. Pinto,Chinnakonda S. Gopinath,S. Subramanian +7 more
TL;DR: A single phase Sr-based Tb-123 phase has been synthesized by chemical stabilization as mentioned in this paper, which exhibits superconductivity at Tc, zero=22 K. Tb is present as a trivalent ion in the superconducting phase as derived from x-ray photoelectron spectroscopy.