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Synthesis and Processing of $MgB_2$ powders and wires | | C. E. Cunningham
; C. Petrovic
; G. Lapertot
; S. L. Bud’ko
; F. Laabs
; W. Straszheim
; D. K. Finnemore
; P. C. Canfield
; | | Date: |
19 Mar 2001 | | Subject: | Superconductivity; Materials Science | cond-mat.supr-con cond-mat.mtrl-sci | | Abstract: | Sintered powders and wires of superconducting $MgB_2$ have been fabricated under a variety of conditions in order to determine details of the diffusion of the $Mg$ into $B$ and to study the types of defects that arise during growth. For samples prepared by exposure of boron to $Mg$ vapor at $950^{circ}C$, the conversion of particles of less than $100mu m$ size particles to $MgB_2$ is complete in about $2 h$. The lattice parameters of the $MgB_2$ phase determined from X-ray are independent of the starting stoichiometry and the time of reaction. Wire segments of $MgB_2$ with very little porosity have been produced by reacting $141 mu m$ diameter boron fibers in an atmosphere of excess $Mg$ vapor at $950^{circ}C$. Defects in the reacted fibers are predominantly the voids left as the boron is converted to $MgB_2$. | | Source: | arXiv, cond-mat/0103390 | | Services: | Forum | Review | PDF | Favorites | |
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