STUDY  OXYGEN  CONTENT EFFECTS  ANNEALING FOR HIGH TEMPERATURE(Bi2Ba2Ca1  Cu2O7-δ)

Mohammed, Hussein Ali; FATHI, Dr-SABAH.J.

doi:10.32894/kujss.2009.40109

	STUDY OXYGEN CONTENT EFFECTS ANNEALING FOR HIGH TEMPERATURE(Bi2Ba2Ca1 Cu2O7-δ)
Kirkuk Journal of Science
Article 1, Volume 4, Issue 1, 2009, Pages 35-47 PDF (0 K)
Document Type: Research Paper
DOI: 10.32894/kujss.2009.40109
Authors
Hussein Ali Mohammed; Dr-SABAH.J. FATHI
College of Science-Uninversity of Kirkuk
Abstract
samples of high temperature superconductors(Bi2 Ba2 Ca1 Cu2 O7-δ) [System2212] were prepared by solid state reaction method with different sintering temperature (i.e790,830,860,890). C° X-ray analysis techniques were used to examine the structure of the compound, the study showed ,that the sample prepared during sintering temparture at 860 ċ exhibite tetragonal phase with lattice parameter, (a=b=5.43A° ,c=31.55 A°) while the compound prepared at 890C° Exhibit achange of structure from (tetragonal to orthorhombic) phase this is due to decreasing in(c) axise and increasing in the other two axises (a,b)and the value of lattice parameters were a=5.45A° , b=5.48A° ,c=30,9 5A° Electric resistivity method were used to determine the critica temperature T of these compounds using liquid nitrogen cryostat the compounds prepared at [790,830,860 and 890]. C°Showed Tc volues of [89, 101.5,121.0 and85]k respective and the values of Oxygen content is[6.25,6.43,6.51,and6.75] The change of TC values can be explained on the basis that increasing the sintering temperature produces a more uniform crystal structure and an increased oxygen content in the compound .
Keywords
Study; Oxygen; content; EFFECTS ANNEALING; high; temperature

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