Preparation of Bi-Sr-Ca-Cu-O superconductors from oxide-glass precursors

Abstract

In this letter we report on efforts to synthesize the new Ca-Sr-Bi-Cu-O superconductors from amorphous glasses. These glasses are produced by quenching melts of the constituent oxides, followed by firing to produce the superconducting phase. This synthetic route produces denser, more uniform samples than those obtained from firing intimate mixtures of the constituent binary oxides and carbonates. Ultimately, this technique may yield pure materials with enhanced bulk properties.

Effect of Li2O on structure and optical properties of lithium bismosilicate glasses

“…The large polarizability and small field strength of Bi 3+ in oxide glasses make them suitable for optical devices such as ultra fast all optical switches, optical isolators, optical Kerr shutters (OKR) and environmental guidelines [6]. After an appropriate annealing, these glasses are also used to produce high temperature superconductors with controllable microstructure [7][8][9]. In addition, these glasses have a very high secondary emission coefficient and used in the production of electron multipliers after reduction in hydrogen atmosphere [10][11][12].…”

Vibrational spectra and structure of bismuth based quaternary glasses

“…[1]. These glasses are also used to produce after appropriate annealing high temperature super conductors [2][3][4]. Despite the fact that Bi 2 O 3 is not a classical glass former, due to its high polarizability and small field strength of Bi 3+ ions, in the presence of conventional glass formers (such as B 2 O 3 , PbO, SiO 2 ) it may build a glass network of [BiO n ] pyramids [5].…”

Bi-based high Tc superconducting fibers by melt extraction

“…Splat quenching of molten mixtures OlitO large heat sinks such as copper or stainless steel blocks is the simplest technique and has proven effective in producing high quality samples. Thin plates with dia.meters of several centimeters and thickness less than 0.3 mm can be produced in this fashion (Hinks et al, 1988). The twin roller method was also employed successfully to produce samples 20-25 pm thick, 5-15 mm wide, and 20-50 mm long (Komatsu et al, 1988b The best results achieved to date have been with tapes produeed by cold rolling…”

“…The high density and increased homogeneity of the amorphous precursors alleviate the problem of long-range diffusion during synthesis of crystalline su.perconducting samples. It was hoped that the rapid solidification route would lead to pure materials with enhanced bulk properties, such as higher critical currents (Hinks et al, 1988).…”