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Title: Preparation, structure, and peritectic transition of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) superconductors

Abstract

A series of single-phase RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (T = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) compounds with a triple-perovskite unit cell has been prepared by solid-state reaction method. Samples with a larger radius of the R ion (R = La and Nd) are tetragonal, whereas those with a smaller radius of the R ion (R = Sm, Eu, Gd, Dy, Ho, and Y) are orthorhombic. Unit-cell parameters of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} decrease monotonically with a decrease of the radius of the R ion. A maximum at R = Nd, Sm, and Eu is found in the peritectic transition temperature (t{sub p}), the amount of oxygen loss ({Delta}w) in this transition, and the enthalpy of fusion ({Delta}H{sub f}), respectively. An increase in the {Delta}H{sub f} is correlated with increasing t{sub p} for the respective orthorhombic and tetragonal phases of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} compounds. {Tc} of the title compounds gradually increased from 52 to 86 K with a decrease in the radius of the R ion.

Authors:
; ; ;  [1]
  1. Tamkang Univ., Tamsui (Taiwan, Province of China). Dept. of Chemistry
Publication Date:
OSTI Identifier:
638343
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 33; Journal Issue: 8; Other Information: PBD: Aug 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; THERMODYNAMIC PROPERTIES; CHEMICAL PREPARATION; RARE EARTHS; YTTRIUM OXIDES; BARIUM OXIDES; STRONTIUM OXIDES; COPPER OXIDES; TETRAGONAL LATTICES; ORTHORHOMBIC LATTICES

Citation Formats

Lin, M Y, Huang, J T, Kao, H C.I., and Wang, C M. Preparation, structure, and peritectic transition of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) superconductors. United States: N. p., 1998. Web. doi:10.1016/S0025-5408(98)00092-0.
Lin, M Y, Huang, J T, Kao, H C.I., & Wang, C M. Preparation, structure, and peritectic transition of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) superconductors. United States. doi:10.1016/S0025-5408(98)00092-0.
Lin, M Y, Huang, J T, Kao, H C.I., and Wang, C M. Sat . "Preparation, structure, and peritectic transition of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) superconductors". United States. doi:10.1016/S0025-5408(98)00092-0.
@article{osti_638343,
title = {Preparation, structure, and peritectic transition of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) superconductors},
author = {Lin, M Y and Huang, J T and Kao, H C.I. and Wang, C M},
abstractNote = {A series of single-phase RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} (T = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) compounds with a triple-perovskite unit cell has been prepared by solid-state reaction method. Samples with a larger radius of the R ion (R = La and Nd) are tetragonal, whereas those with a smaller radius of the R ion (R = Sm, Eu, Gd, Dy, Ho, and Y) are orthorhombic. Unit-cell parameters of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} decrease monotonically with a decrease of the radius of the R ion. A maximum at R = Nd, Sm, and Eu is found in the peritectic transition temperature (t{sub p}), the amount of oxygen loss ({Delta}w) in this transition, and the enthalpy of fusion ({Delta}H{sub f}), respectively. An increase in the {Delta}H{sub f} is correlated with increasing t{sub p} for the respective orthorhombic and tetragonal phases of RBa{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub y} compounds. {Tc} of the title compounds gradually increased from 52 to 86 K with a decrease in the radius of the R ion.},
doi = {10.1016/S0025-5408(98)00092-0},
journal = {Materials Research Bulletin},
number = 8,
volume = 33,
place = {United States},
year = {1998},
month = {8}
}