Hydrothermal synthesis of a new perovskite-type bismuth oxide: Ba0.96Bi0.86O2.59(OH)0.41

Abstract

A new perovskite-type oxide, Ba0.96Bi0.86O2.59(OH)0.41 was prepared by low temperature hydrothermal reaction using NaBiO3·nH2O and Ba(OH)2·8H2O as starting materials. The crystal structure of this compound was refined by single crystal X-ray diffraction data, and the structure refinement with the space group Pm3m (#221) led to Rw = 0.035 and R = 0.054 for all reflections. This compound had the perovskite-type structure with the cubic cell of a = 4.2995(5) Å. The magnetic susceptibility of this compound exhibited no superconductive behavior down to 4 K.

Superconducting Double Perovskite Bismuth Oxide Prepared by a Low‐Temperature Hydrothermal Reaction

“…Another possibility is that the incorporation of Na and/or K into the B site degrades their superconductivity, as is observed in double perovskite structures of Ba 1-x K x Bi 1y Na y O 3 . Accordingly, we assumed the existence of a simple perovskite bismuth oxide, comparable to hydrothermally synthesized cubic Ba 0.96 Bi 0.86 O 2.59 (OH) 0.41 , [22] as a second phase. 27 K).…”

Superconducting Double Perovskite Bismuth Oxide Prepared by a Low‐Temperature Hydrothermal Reaction

“…We observed shoulders on the peaks, which could be indicative of a simple perovskite structure. Accordingly, we assumed the existence of a simple perovskite bismuth oxide, comparable to hydrothermally synthesized cubic Ba 0.96 Bi 0.86 O 2.59 (OH) 0.41 ,22 as a second phase. Thus, the refinement was performed considering the two‐phase model.…”

Hydrothermal synthesis and crystal structure of a novel double-perovskite-type bismuth oxide with 3 : 1 ordering at the B-site

“…The inset shows the optical absorption spectrum, and the absorption edges are located within the visible region. The band gap energy can be determined from the Tauc plot using the relation (han) 2 and hn with the assumption that the compound exhibit direct transitions. 36 Based on these assumptions, the band gap energy for polycrystalline samples has been reported to yield appropriate values for monazite-type oxides.…”

“…Among them, perovskite-type Bi oxides, a type of mixed-metal oxides, are of significant interest, and their properties have been extensively examined in the literature. [1][2][3] The diverse properties of perovskite bismuthates originate from the partial substitution of A-and/or B-site cations, resulting in both simple and double-perovskite-type compounds. 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.…”