Kinetics and stability of R(Ba1.5Sr0.5)Cu3Oy (R=La, Nd, Sm, Eu, Gd, Dy, Ho) superconductors in water

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Title:	Kinetics and stability of R(Ba1.5Sr0.5)Cu3Oy (R=La, Nd, Sm, Eu, Gd, Dy, Ho) superconductors in water
Authors:	Lin, C. H.;高惠春;Kao, H. C. I.;王啟銘;Wang, C. M.
Contributors:	淡江大學化學學系
Keywords:	Superconductors;Solid state synthesis;Corrosion;Oxygen stoichiometry
Date:	2003-11-15
Issue Date:	2009-12-01
Publisher:	Elsevier
Abstract:	The reaction of R(Ba1.5Sr0.5)Cu3Oy (RS123, R=La, Nd, Sm, Eu, Gd, Dy, Ho) powder with water is studied quantitatively. The initial reaction rate law is R0=k[S]0a[H3O+]0b, where [S]0 is the initial surface area of the RS123 superconducting powder. For the entire RS123 series, a is close to 1, indicating that the reaction rate is linearly dependent on the surface area of the powder. However, b is variable for the whole series. For R=La, Nd, Sm, Eu, Gd, Dy, and Ho, b equals to 0.75, 0.70, 0.62, 0.56, 0.51, 0.56, and 0.60, respectively. It is found that the stability of RS123 in water is correlated with the oxygen stoichiometry of RS123. The stability decreases with increasing the oxygen stoichiometry.
Relation:	Materials Chemistry and Physics 82(2), Pp.435-439
DOI:	10.1016/S0254-0584(03)00321-3
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article [Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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