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

Köhler, Jürgen

doi:10.1002/1521-3773(20010702)40:13<2435::aid-anie2435>3.0.co;2-2

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…Ba1-xKxBiO3 (BKBO) is a very interesting superconductor with transition temperature (Tc) about 30 K because it has threedimensional (3D) perovskite structure and no transition metal elements, 1 which has been known for more than thirty years with continuous studies up to now. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Comparing to other supercon-ductors such as cuprate superconductors, 17,18 MgB2, 19,20 and Fe-base superconductors, 21,22 the studies on BKBO seem less. One possible reason may be that the pure superconducting BKBO is not easy to be obtained.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis of Superconductor Ba1-xKxBiO3

Li¹,

Li²,

Wang³

et al. 2014

Acta Physico-Chimica Sinica

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was synthesized using a topotactic reaction, which involves a conventional solidstate synthesis of pure BaBiO3, using BaCO3 and Bi2O3 as the raw materials, and subsequent treatment of BaBiO3 in a KOH flux at low temperature. All samples were characterized using X-ray diffraction (XRD) and magnetic susceptibility measurements. The XRD patterns show that there is no apparent impurity in the obtained Ba1-xKxBiO3 samples, and all the diffraction data can be indexed using a pseudo-cubic cell. All the samples showed superconductivity, and the highest superconducting transition temperature (Tc) was 30.6 K. The influences of the reaction time and the ratio of the precursor to the molten salts on the transition temperature were investigated. The best reaction conditions were treatment at 450°C for 4 h, with BaBiO3:KOH:KF mass ratio of 1:5:2.5.

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Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis of Superconductor Ba1-xKxBiO3

Li¹,

Li²,

Wang³

et al. 2014

Acta Physico-Chimica Sinica

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Boratome als Spinträger in zwei‐ und dreidimensionalen Systemen

et al. 2009

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Die ungewöhnliche Bindung von Bor in Organoboranen oder Oligoborclustern tritt nicht nur in diamagnetischen Molekülen auf, sondern auch in paramagnetischen Systemen, die gemischtvalente Verbindungen und Oligoboran/Carboran‐Clusterradikale umfassen. Das Bild zeigt das einfach besetzte Molekülorbital des Radikalions [C4B8R4H8].− gemäß DFT‐Rechnungen.magnified imageParamagnetische Verbindungen mit mindestens teilweise borzentriertem Elektronenspin lassen sich herstellen, indem entweder durch planare, π‐konjugierte organische Systeme verbrückte Boratome als idealtypische Elektronenakzeptoren verwendet werden oder indem die dreidimensionale, delokalisierte Bindung in mehrkernigen Boranen, Halogenboranen oder Carboranclustern genutzt wird. Das Konzept der Gemischtvalenz kann so von organischen und Übergangsmetallverbindungen auf Verbindungen der Hauptgruppenelemente übertragen werden. Mithilfe der Dichtefunktionaltheorie lässt sich die sehr variable Spinverteilung nachvollziehen.

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Boron Atoms as Spin Carriers in Two‐ and Three‐Dimensional Systems

et al. 2009

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Paramagnetic compounds with at least partially boron-centered electron spin can be constructed using either the prototypically electron-accepting boron atoms bridged by planar pi-conjugated organic systems, or by taking advantage of the three-dimensional delocalized bonding in oligonuclear borane, haloborane, or carborane clusters. The concept of mixed valency can thus be transferred from organic and transition-metal chemistry to main-group-element molecules, and density functional theory is capable of reproducing the variable spin distribution.

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

Cited by 5 publications

References 25 publications

Low-Temperature Synthesis of Superconductor Ba<sub>1-<em>x</em></sub>K<sub><em>x</em></sub>BiO<sub>3</sub>

Low-Temperature Synthesis of Superconductor Ba<sub>1-<em>x</em></sub>K<sub><em>x</em></sub>BiO<sub>3</sub>

Boratome als Spinträger in zwei‐ und dreidimensionalen Systemen

Boron Atoms as Spin Carriers in Two‐ and Three‐Dimensional Systems

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