Segregation and dissolution reactions of the 2223 phase in the Bi, Pb-Sr-Ca-Cu-O system on annealing in air

Y. Kusano, Tokuro Nanba, J. Takada, T. Egi, Y. Ikeda, M. Takano

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Thermal behavior of the Pb-substituted Bi-2223 phase was examined by characterizing samples annealed at 500°C to 850°C in air and also those subsequently reheated at 850°C in air by XRD, SEM and magnetic measurements. Very interesting reactions occurred, which were segregation of precipitates on annealing below 830°C and dissolution of the precipitates on subsequent reheating at 850°C into the 2223 phase. The precipitates were identified as Sr2.5Bi0.5Pb3Ca2CuO2. The precipitation and the dissolution were clearly confirmed by morphological observations of a fixed portion of a sample before and after heat treatments. These results strongly suggest that the 2223 phase changes its composition reversibly between the relatively Pb-rich composition stabilized above 850°C and relatively Pb-poor ones stabilized in essentially the same structure below 830°C. However, Tc remained almost constant at 113 K.

Original languageEnglish
Pages (from-to)366-370
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume219
Issue number3-4
DOIs
Publication statusPublished - Jan 15 1994

Fingerprint

Precipitates
precipitates
dissolving
Dissolution
Annealing
annealing
air
Air
Magnetic variables measurement
Chemical analysis
magnetic measurement
heat treatment
Heat treatment
Scanning electron microscopy
scanning electron microscopy
heating
Hot Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Segregation and dissolution reactions of the 2223 phase in the Bi, Pb-Sr-Ca-Cu-O system on annealing in air. / Kusano, Y.; Nanba, Tokuro; Takada, J.; Egi, T.; Ikeda, Y.; Takano, M.

In: Physica C: Superconductivity and its Applications, Vol. 219, No. 3-4, 15.01.1994, p. 366-370.

Research output: Contribution to journalArticle

@article{aa83f3b3cbc34e54a5a4314e6d7f5590,
title = "Segregation and dissolution reactions of the 2223 phase in the Bi, Pb-Sr-Ca-Cu-O system on annealing in air",
abstract = "Thermal behavior of the Pb-substituted Bi-2223 phase was examined by characterizing samples annealed at 500°C to 850°C in air and also those subsequently reheated at 850°C in air by XRD, SEM and magnetic measurements. Very interesting reactions occurred, which were segregation of precipitates on annealing below 830°C and dissolution of the precipitates on subsequent reheating at 850°C into the 2223 phase. The precipitates were identified as Sr2.5Bi0.5Pb3Ca2CuO2. The precipitation and the dissolution were clearly confirmed by morphological observations of a fixed portion of a sample before and after heat treatments. These results strongly suggest that the 2223 phase changes its composition reversibly between the relatively Pb-rich composition stabilized above 850°C and relatively Pb-poor ones stabilized in essentially the same structure below 830°C. However, Tc remained almost constant at 113 K.",
author = "Y. Kusano and Tokuro Nanba and J. Takada and T. Egi and Y. Ikeda and M. Takano",
year = "1994",
month = "1",
day = "15",
doi = "10.1016/0921-4534(94)90388-3",
language = "English",
volume = "219",
pages = "366--370",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - Segregation and dissolution reactions of the 2223 phase in the Bi, Pb-Sr-Ca-Cu-O system on annealing in air

AU - Kusano, Y.

AU - Nanba, Tokuro

AU - Takada, J.

AU - Egi, T.

AU - Ikeda, Y.

AU - Takano, M.

PY - 1994/1/15

Y1 - 1994/1/15

N2 - Thermal behavior of the Pb-substituted Bi-2223 phase was examined by characterizing samples annealed at 500°C to 850°C in air and also those subsequently reheated at 850°C in air by XRD, SEM and magnetic measurements. Very interesting reactions occurred, which were segregation of precipitates on annealing below 830°C and dissolution of the precipitates on subsequent reheating at 850°C into the 2223 phase. The precipitates were identified as Sr2.5Bi0.5Pb3Ca2CuO2. The precipitation and the dissolution were clearly confirmed by morphological observations of a fixed portion of a sample before and after heat treatments. These results strongly suggest that the 2223 phase changes its composition reversibly between the relatively Pb-rich composition stabilized above 850°C and relatively Pb-poor ones stabilized in essentially the same structure below 830°C. However, Tc remained almost constant at 113 K.

AB - Thermal behavior of the Pb-substituted Bi-2223 phase was examined by characterizing samples annealed at 500°C to 850°C in air and also those subsequently reheated at 850°C in air by XRD, SEM and magnetic measurements. Very interesting reactions occurred, which were segregation of precipitates on annealing below 830°C and dissolution of the precipitates on subsequent reheating at 850°C into the 2223 phase. The precipitates were identified as Sr2.5Bi0.5Pb3Ca2CuO2. The precipitation and the dissolution were clearly confirmed by morphological observations of a fixed portion of a sample before and after heat treatments. These results strongly suggest that the 2223 phase changes its composition reversibly between the relatively Pb-rich composition stabilized above 850°C and relatively Pb-poor ones stabilized in essentially the same structure below 830°C. However, Tc remained almost constant at 113 K.

UR - http://www.scopus.com/inward/record.url?scp=0028274368&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028274368&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(94)90388-3

DO - 10.1016/0921-4534(94)90388-3

M3 - Article

VL - 219

SP - 366

EP - 370

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 3-4

ER -