Title
|
|
|
|
Facile synthesis of superconductors via hydride route
|
|
Author
|
|
|
|
|
|
Abstract
|
|
|
|
We have developed a fast, easy, and scalable synthesis method for Ba1xKxFe2As2 (0 ≤ x ≤ 1) superconductors using hydrides BaH2 and KH as a source of barium and potassium metals. Synthesis from hydrides provides better mixing and easier handling of the starting materials, consequently leading to faster reactions and/or lower synthesis temperatures. The reducing atmosphere provided by the evolved hydrogen facilitates preparation of oxygen-free powders. By a combination of methods we have shown that Ba1xKxFe2As2 obtained via hydride route has the same characteristics as when it is prepared by traditional solid-state synthesis. Refinement from synchrotron powder X-ray diffraction data confirms a linear dependence of unit cell parameters upon K content as well as the tetragonal to orthorhombic transition at low temperatures for compositions with x < 0.2. Magnetic measurements revealed dome-like dependence of superconducting transition temperature Tc upon K content with a maximum of 38 K for x close to 0.4. Electron diffraction and high-resolution high-angle annular dark-field scanning transmission electron microscopy indicates an absence of Ba/K ordering, while local inhomogeneity in the Ba/K distribution takes place at a scale of several angstroms along [110] crystallographic direction. |
|
|
Language
|
|
|
|
English
|
|
Source (journal)
|
|
|
|
Journal of the American Chemical Society. - Washington, D.C., 1879, currens
|
|
Publication
|
|
|
|
Washington, D.C.
:
American Chemical Society
,
2014
|
|
ISSN
|
|
|
|
0002-7863
|
|
DOI
|
|
|
|
10.1021/JA509907R
|
|
Volume/pages
|
|
|
|
136
:48
(2014)
, p. 16932-16939
|
|
ISI
|
|
|
|
000345883900040
|
|
Pubmed ID
|
|
|
|
25386877
|
|
Full text (Publisher's DOI)
|
|
|
|
|
|
Full text (open access)
|
|
|
|
|
|