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Title: Novel features of rapidly quenched melts of Bi2(Ca,Sr)3Cu2O8+δ
Authors: Varma, K B R
Rao, K J
Rao, C N R
Keywords: Bismuth Calcium Copper Strontium Oxides Mixed
Differential scanning calorimetry
Microwave absorption
Amorphous state
Electrical conductivity
Superconducting transition
X ray diffraction
High temperature superconductor
Transition metal Compounds
Issue Date: 2-Jan-1989
Publisher: American Institute of Physics
Citation: Applied Physics Letters 54(1), 69-71 (1989)
Abstract: 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.
Description: Restricted Access
Other Identifiers: 0003-6951
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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