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Novel features of rapidly quenched melts of Bi2(Ca,Sr)3Cu2O8+δ

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3 Author(s)
Varma, K.B.R. ; Materials Research Centre and Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India ; Rao, K.J. ; Rao, C.N.R.

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By roller quenching and water quenching melts of Bi2(Ca, Sr)3Cu2O8+δ, glasses have been obtained. These glasses exhibit two glass transitions as well as two crystallization transitions. Microwave absorption studies show the glass to be weakly superconducting at 77 K, probably due to the presence of ultramicrocrystallites. The glass on crystallization at 870 K gives the crystalline n=1 member of the homologous series Bi2(Ca, Sr)n+1CunO2n+4 and the n=2 member on annealing at 1100 K. The glass route provides a unique means of obtaining the n=2 member of the series. On prolonged annealing of the glass at 1120 K, the n=3 member seems to be formed.

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Applied Physics Letters  (Volume:54 ,  Issue: 1 )