New Bi-based high-Tc superconducting phases obtained by low-temperature fluorination

E. Bellingeri, G. Grasso, R. E. Gladyshevskii, M. Dhallé, R. Flükiger

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

A new superconducting phase, Bi2Sr2Ca2Cu3O8F4, was obtained by fluorination of standard Bi(2223) at moderate temperatures (250-300 °C), using as fluorine source ammonium hydrogen difluoride, NH4HF2. The presence of fluorine in this new phase was confirmed by energy-dispersive X-ray analysis. X-ray and neutron diffraction experiments furthermore showed that fluorine atoms replace oxygen atoms in the BiO layers in the ratio 2:1. The additional anions form a square-mesh layer between neighboring BiF layers. The incorporation of fluorine increases the crystallographic c-axis parameter by approximately 1.8 angstroms (a = 5.409 angstroms, b = 5.407 angstroms, c = 38.792 angstroms). The CuO2 layers remain undistorted but the distance from the Cu atom to the apical oxygen atom of the square pyramids is decreased to 2.27 angstroms, with respect to 2.42 angstroms in the original phase. The superconducting transition temperature, determined from magnetic susceptibility measurements, was found to be 75 K. When applied to Bi(2212), the same fluorination process produced the new phase Bi2Sr2CaCu2O6F4 with similar structural features.

Original languageEnglish
Pages (from-to)267-278
Number of pages12
JournalPhysica C: Superconductivity and its applications
Volume329
Issue number4
DOIs
Publication statusPublished - 15 Feb 2000
Externally publishedYes

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Fluorination
fluorination
Fluorine
fluorine
Atoms
oxygen atoms
Oxygen
difluorides
Temperature
Energy dispersive X ray analysis
Neutron diffraction
pyramids
Magnetic susceptibility
Ammonium Compounds
Superconducting transition temperature
Anions
atoms
neutron diffraction
mesh
Hydrogen

Cite this

Bellingeri, E. ; Grasso, G. ; Gladyshevskii, R. E. ; Dhallé, M. ; Flükiger, R. / New Bi-based high-Tc superconducting phases obtained by low-temperature fluorination. In: Physica C: Superconductivity and its applications. 2000 ; Vol. 329, No. 4. pp. 267-278.
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New Bi-based high-Tc superconducting phases obtained by low-temperature fluorination. / Bellingeri, E.; Grasso, G.; Gladyshevskii, R. E.; Dhallé, M.; Flükiger, R.

In: Physica C: Superconductivity and its applications, Vol. 329, No. 4, 15.02.2000, p. 267-278.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Grasso, G.

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