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Title: The effect of heat treatment on the properties of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {delta}}

Abstract

In synthesis of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 2}O{sub {delta}} (2-2-2-3 phase), which is known to belong to a homologous series of bismuth-based superconductors, several routes have been reported to date to yield materials with a high content, around 95% of the main phase. This phase is characterized by the highest superconducting-transition temperature {Tc} among all known high-{Tc} materials. Based on literature data, heat-treatment conditions are expected to affect strongly the {Tc} of the 2-2-2-3 phase, as they do for other high-{Tc} materials. An optimal oxygen content in 2-2-2-3 was presumed to be the deciding factor for attainment of high {Tc}`s. However, heating below {approximately} 870 K in air causes no change in oxygen content in the 2-2-2-3 phase. At the same time, it is oxidizing annealing at T < 970 K that increases {Tc} up to 105-110 K. The conclusions found that changes in oxygen content for (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 2}O{sub {delta}} (2-2-2-3 phase) do not affect T{sub c}, which remains unchanged after shor anneals at 370-1020 Kelvin in different atmospheres. In order to obtain high T{sub c}`s, it will suffice to exclude long anneals at 1020-1090 Kelvin from the technology. For the 2-2-2-3 phase, a degradation process, whichmore » does not change the composition of the phase, is like that for YBa{sub 2}Cu{sub 3}O{sub 6+delta}. Proposed is that different structural planes participate in mass exhanage with an atmosphere: (BiO) planes which do not participate to superconductivity, participate in oxygen exchange; and H{sub 2}O and CO{sub 2} penetrate into the CuO{sub 2} planes, which are responsible for superconductivity in the 2-2-2-3 phase.« less

Authors:
; ;  [1]
  1. Institute of Solid-State Chemistry, Ekaterinburg (Russian Federation)
Publication Date:
OSTI Identifier:
98716
Resource Type:
Journal Article
Journal Name:
Inorganic Materials
Additional Journal Information:
Journal Volume: 30; Journal Issue: 8; Other Information: PBD: Aug 1994; TN: Translated from Neorganicheskie Materialy; 30: No. 8, 1074-1077(1994)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; HEAT TREATMENTS; STRUCTURAL CHEMICAL ANALYSIS; BISMUTH OXIDES; SUPERCONDUCTIVITY; LEAD OXIDES; STRONTIUM OXIDES; CALCIUM OXIDES; COPPER OXIDES; ANNEALING; TRANSITION TEMPERATURE; CHEMICAL PREPARATION; OXYGEN

Citation Formats

Fetisov, A V, Yasnikov, A G, and Fotiev, A A. The effect of heat treatment on the properties of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {delta}}. United States: N. p., 1994. Web.
Fetisov, A V, Yasnikov, A G, & Fotiev, A A. The effect of heat treatment on the properties of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {delta}}. United States.
Fetisov, A V, Yasnikov, A G, and Fotiev, A A. 1994. "The effect of heat treatment on the properties of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {delta}}". United States.
@article{osti_98716,
title = {The effect of heat treatment on the properties of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {delta}}},
author = {Fetisov, A V and Yasnikov, A G and Fotiev, A A},
abstractNote = {In synthesis of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 2}O{sub {delta}} (2-2-2-3 phase), which is known to belong to a homologous series of bismuth-based superconductors, several routes have been reported to date to yield materials with a high content, around 95% of the main phase. This phase is characterized by the highest superconducting-transition temperature {Tc} among all known high-{Tc} materials. Based on literature data, heat-treatment conditions are expected to affect strongly the {Tc} of the 2-2-2-3 phase, as they do for other high-{Tc} materials. An optimal oxygen content in 2-2-2-3 was presumed to be the deciding factor for attainment of high {Tc}`s. However, heating below {approximately} 870 K in air causes no change in oxygen content in the 2-2-2-3 phase. At the same time, it is oxidizing annealing at T < 970 K that increases {Tc} up to 105-110 K. The conclusions found that changes in oxygen content for (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 2}O{sub {delta}} (2-2-2-3 phase) do not affect T{sub c}, which remains unchanged after shor anneals at 370-1020 Kelvin in different atmospheres. In order to obtain high T{sub c}`s, it will suffice to exclude long anneals at 1020-1090 Kelvin from the technology. For the 2-2-2-3 phase, a degradation process, which does not change the composition of the phase, is like that for YBa{sub 2}Cu{sub 3}O{sub 6+delta}. Proposed is that different structural planes participate in mass exhanage with an atmosphere: (BiO) planes which do not participate to superconductivity, participate in oxygen exchange; and H{sub 2}O and CO{sub 2} penetrate into the CuO{sub 2} planes, which are responsible for superconductivity in the 2-2-2-3 phase.},
doi = {},
url = {https://www.osti.gov/biblio/98716}, journal = {Inorganic Materials},
number = 8,
volume = 30,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 1994},
month = {Mon Aug 01 00:00:00 EDT 1994}
}