Structural Studies of Order, Disorder, and Stoichiometry in Some High T<Subscript>c</Subscript> Nb-Base A-15 Superconductors: Fid-Bau Portal

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Structural Studies of Order, Disorder, and Stoichiometry in Some High Tc Nb-Base A-15 Superconductors

Cox, D. E. / Moehlecke, S. / Sweedler, A. R. / Newkirk, L. R. / Valencia, F. A.

Abstract X-ray intensity measurements have been made on several Nb-base A-15 type superconductors. Order parameters have been determined with reasonable accuracy even in the presence of substantial amounts of impurity phases. Chemically vapor deposited Nb3Ge of near-stoichiometric composition is characterized by a significant amount of disorder, corresponding to occupation of about 4% of the Nb sites by Ge. Annealing at 1350°C converts this material to a Nb-rich A-15 phase and Nb5Ge3. The former has essentially no Ge on Nb sites. From the lattice parameter trends in these compounds and the A-15 region of the Nb-Pt system, a B site radius of 1.43 Å for Nb is proposed. This is significantly different from the A site radius of 1.51 Å and closer to the normal metallic twelve-coordinated value.

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Structural Studies of Order, Disorder, and Stoichiometry in Some High Tc Nb-Base A-15 Superconductors

Cox, D. E. / Moehlecke, S. / Sweedler, A. R. / Newkirk, L. R. / Valencia, F. A.

Abstract X-ray intensity measurements have been made on several Nb-base A-15 type superconductors. Order parameters have been determined with reasonable accuracy even in the presence of substantial amounts of impurity phases. Chemically vapor deposited Nb3Ge of near-stoichiometric composition is characterized by a significant amount of disorder, corresponding to occupation of about 4% of the Nb sites by Ge. Annealing at 1350°C converts this material to a Nb-rich A-15 phase and Nb5Ge3. The former has essentially no Ge on Nb sites. From the lattice parameter trends in these compounds and the A-15 region of the Nb-Pt system, a B site radius of 1.43 Å for Nb is proposed. This is significantly different from the A site radius of 1.51 Å and closer to the normal metallic twelve-coordinated value.

Structural Studies of Order, Disorder, and Stoichiometry in Some High Tc Nb-Base A-15 Superconductors

Cox, D. E. / Moehlecke, S. / Sweedler, A. R. / Newkirk, L. R. / Valencia, F. A.

Abstract X-ray intensity measurements have been made on several Nb-base A-15 type superconductors. Order parameters have been determined with reasonable accuracy even in the presence of substantial amounts of impurity phases. Chemically vapor deposited Nb3Ge of near-stoichiometric composition is characterized by a significant amount of disorder, corresponding to occupation of about 4% of the Nb sites by Ge. Annealing at 1350°C converts this material to a Nb-rich A-15 phase and Nb5Ge3. The former has essentially no Ge on Nb sites. From the lattice parameter trends in these compounds and the A-15 region of the Nb-Pt system, a B site radius of 1.43 Å for Nb is proposed. This is significantly different from the A site radius of 1.51 Å and closer to the normal metallic twelve-coordinated value.

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Title:

Structural Studies of Order, Disorder, and Stoichiometry in Some High Tc Nb-Base A-15 Superconductors

Contributors:

Cox, D. E. (author) / Moehlecke, S. (author) / Sweedler, A. R. (author) / Newkirk, L. R. (author) / Valencia, F. A. (author)

Published in:

Superconductivity in d- and f-Band Metals ; 461-487

Publication date:

1976-01-01

Size:

27 pages

ISBN:

978-1-4615-8797-2 , 978-1-4615-8795-8

DOI:

https://doi.org/10.1007/978-1-4615-8795-8_28

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Neutron Diffraction Study , Waller Factor , Occupation Factor , Site Radius , Niobium System Physics , Strongly Correlated Systems, Superconductivity , Characterization and Evaluation of Materials

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