عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
NATIONAL BIBLIOGRAPHY NUMBER
Number
TLpq194069614
LANGUAGE OF THE ITEM
.Language of Text, Soundtrack etc
انگلیسی
TITLE AND STATEMENT OF RESPONSIBILITY
Title Proper
Experimental studies of yttrium barium(2)(copper(1-x)iron(x))(3)oxygen(7+delta) and bismuth(2)strontium(2)calcium(n-1)copper(n)oxygen(2n+4) high T(c) superconductors
General Material Designation
[Thesis]
First Statement of Responsibility
H. Lu
Subsequent Statement of Responsibility
F. D. Medina
.PUBLICATION, DISTRIBUTION, ETC
Name of Publisher, Distributor, etc.
Florida Atlantic University
Date of Publication, Distribution, etc.
1990
PHYSICAL DESCRIPTION
Specific Material Designation and Extent of Item
122
DISSERTATION (THESIS) NOTE
Dissertation or thesis details and type of degree
M.S.
Body granting the degree
Florida Atlantic University
Text preceding or following the note
1990
SUMMARY OR ABSTRACT
Text of Note
Fe-substituted Y123 and Bi-based high usd\rm T\sb{c}usd superconducting samples were prepared and studied. Magnetic susceptibility measurements, x-ray diffraction and Scanning Electron Microscopy were used to study the transition temperature usd\rm T\sb{c}usd, preferential grain orientation and phase formation of the compounds. usd\rm T\sb{c}usd was found to decrease more rapidly with Fe concentrations above 2.5%. Thermally reducing the oxygen content shows that Fe clusters form at high Fe concentrations. Magnetic susceptibility and x-ray diffraction measurements show that only the 80 K phase is present in usd\rm Bi\sb4Sr\sb3Ca\sb3Cu\sb6O\sb{x}usd samples. For usd\rm Bio\sb{0.7}Pb\sb{0.3}SrCaCu\sb{1.8}O\sb{x}usd and usd\rm Bi\sb{1.8}Pb\sb{0.2}Sr\sb2Ca\sb2Cu\sb3P\sb{x}usd samples, the 110 K phase becomes dominant after sintering for 126 hours and 48 hours respectively. Preferential grain orientation was also observed in these materials.
TOPICAL NAME USED AS SUBJECT
Condensation
Pure sciences
PERSONAL NAME - PRIMARY RESPONSIBILITY
F. D. Medina
H. Lu
ELECTRONIC LOCATION AND ACCESS
Electronic name
مطالعه متن کتاب p
[Thesis]
276903
a
Y
