Abstract:Double-perovskite
Bi oxides are a new series of superconducting
materials, and their crystal structure and superconducting properties
are under investigation. In this paper, we describe the synthesis
and characterization of a new double-perovskite material that has
an increased superconductive transition temperature of 31.5 K. The
structure of the material was examined using powder neutron diffraction
(ND), synchrotron X-ray diffraction (SXRD), and transmission electron
microscopy (TEM). Rietveld refinement of… Show more
“…For example, the material (K1.00)(Ba1.00)3(Bi0.89Na0.11)4O12 shows ordering of the A-site K and Ba, while the B-site Bi and Na share the same crystallographic position to give a body-centred cubic unit cell with edge length double the conventional perovskite structure, Figure 22. [243] In the case of (Ba0.62K0.38)(Bi0.92Mg0.08)O3, the A-site and Bsite cations show no ordering, [244] and the metallic nature of the material was verified using first-principles calculations. [245] For several of these materials the onset of superconductivity was measured by detecting the characteristic diamagnetism in a polycrystalline powder, but also from resistivity measurements of pressed pellets.…”
Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.
“…For example, the material (K1.00)(Ba1.00)3(Bi0.89Na0.11)4O12 shows ordering of the A-site K and Ba, while the B-site Bi and Na share the same crystallographic position to give a body-centred cubic unit cell with edge length double the conventional perovskite structure, Figure 22. [243] In the case of (Ba0.62K0.38)(Bi0.92Mg0.08)O3, the A-site and Bsite cations show no ordering, [244] and the metallic nature of the material was verified using first-principles calculations. [245] For several of these materials the onset of superconductivity was measured by detecting the characteristic diamagnetism in a polycrystalline powder, but also from resistivity measurements of pressed pellets.…”
Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.
“…3 shows a comparative graphical representation of the unit cell volume versus the sum of the ionic radii of the A and B cations of Ba 4 Bi 3 NaO 12 and the previously reported perovskitetype superconducting and semiconducting bismuth oxides. [3][4][5][6][7]10,11,13,14,30,43,46 The novel compound (blue circle) exhibited an almost linear relationship with the semiconducting bismuth oxides (red circle). It was also located near the region of some superconducting bismuth oxides (green circle); however, this compound may not be a superconductor because of the presence of only Bi 5+ at the B-site.…”
Section: Crystal Structurementioning
confidence: 99%
“…4,5 Recently, a variety of perovskite-type bismuth oxides have been synthesized by a low-temperature hydrothermal method using NaBiO 3 ÁnH 2 O as the starting material. [4][5][6][7][8][9] In this method, the partial substitution of A-and B-site cations significantly affects the structure and various properties of the compounds. Monoclinic BaBiO 3 was found to be semiconducting with a distorted perovskite-type structure, and the BiO 6 octahedra were tilted at a lower angle.…”
Section: Introductionmentioning
confidence: 99%
“…28,29,[34][35][36] Moreover, hydrothermally prepared single-and double-perovskite-type bismuth oxides exhibited superconductivity with relatively high transition temperatures. 4,6,7,13,30 Therefore, based on the exploration of more compounds, a novel perovskitetype bismuth oxide was developed via a facile hydrothermal reaction using NaBiO 3 ÁnH 2 O as the starting material. This study discusses the crystal structure, thermal stability, photocatalytic activity, and electronic band structure of the newly synthesized bismuth oxide.…”
A low-temperature hydrothermal method was successfully used to synthesize a novel bismuth oxide Ba4Bi3NaO12. Here, NaBiO3·nH2O was used as one of the starting materials. Single-crystal X-ray diffraction revealed the triclinic...
“…[9][10][11][12][13] While 4d or 5d transition metal based layered perovskite structures of Dion-Jacobson, Ruddlesden-Popper and Aurivillius phases are obtained by the exfoliation method, 9 the exploration of other 2D perovskite oxide systems with strongly correlated d-orbital electrons is impeded by the expensive physical techniques. Equipped with exotic properties such as high oxygen mobility, extensive stoichiometric range, redox exibility and thermal stability, the applications of perovskites span a rich spectrum of high temperature superconductivity, 14 colossal magnetoresistance, 15,16 ferroelectricity, 17 high dielectric constant, 18 sensing, 1 fuel cells, 19,20 electrocatalytic conversion, 21,22 and storage. 23,24 Planar manifestation of this outstanding class of complex oxides, especially with rst row transition metals, by avant-garde methods is expected to imbibe state-of-the-art fundamental properties leading to newer functionalities and devices.…”
The catalyst surface undergoes reversible structural changes while influencing the rate of redox reaction, the atomistic structural details of which are often overlooked when the key focus is to enhance...
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