Growth and structural characterization of superconducting Ba1–xKxBiO3 single crystals

Hydrothermal synthesis of superconductors Ba1−xKxBiO3 and double perovskites Ba1−xKxBi1−yNayO3

“…Moreover, some non-superconductor phases, such as layered bismuthate ((Ba,K) 3 Bi 2 O 7 ) [14] and the body-centered double cubic perovskite (Ba 1−x K x Bi 1−y Na y O 3 ) [15], could also be formed during the electrolysis. Although the molten salt process seems somewhat straightforward, the multiphase usually occurs and the crystal morphologies of Ba 1−x K x BiO 3 are comparatively poor [16][17][18]. Thus, a facile and mild synthesis method is worthwhile to prepare Ba 1−x K x BiO 3 system and even to exploit new superconducting materials.…”

Noncuprate superconductors

“…K 1 ions replace some of the Ba 21 ions in the C site, and Bi ions occupy the E sites of Eq. (7.2) (Hinks et al, 1988a, b;Kwei et al, 1989;Pei et al, 1990;Salem-Sugui et al, 1991;Schneemeyer et al, 1988). Some oxygen sites are vacant, as indicated by Hinks et al (1989a,b), and Pei et al (1990) determined the structural phase diagram (cf.…”

Superconductivity in MgB2 at 39 K—A Sensational and Curious Discovery

“…[10] The best superconductor of this modern generation indeed works above 100 K, but cannot transport sufficient current for practical applications without being cooled far below its critical temperature. Conventional superconductors with higher T C values have been found only recently, for example 33 K in Cs x Rb y C 60 , [11] 30 K in Ba 1Àx K x BiO 3 , [12] and 52 K in hole-doped surfaces of C 60 crystals. [13] MgB 2 with a transition temperature of 39 K lies in this order of magnitude and has been simply overlooked during the search for new superconductors over the past decades.…”