Experimental studies of yttrium barium(2)(copper(1-x)iron(x))(3)oxygen(7+delta) and bismuth(2)stront...

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" 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 "
H. Lu F. D. Medina

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112634
Doc. No	:	TLpq194069614
Main Entry	:	F. D. Medina
	:	H. Lu
Title & Author	:	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\ H. LuF. D. Medina
College	:	Florida Atlantic University
Date	:	1990
student score	:	1990
Degree	:	M.S.
Page No	:	122
Abstract	:	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.
Subject	:	Condensation
	:	Pure sciences