Oxygen ionic transport in Bi 2 O 3 -based oxides: The solid solutions Bi 2 O 3 -Nb 2 O 5

The order–disorder transition in Bi2O3–Nb2O5 fluorite-like dielectrics

“…[4][5][6] The highest oxide-ion conductivity was found for Bi 2 O 3 -Nb 2 O 5 solid solutions, 3 for a composition that coincides with the minimum concentration of Nb 2 O 5 necessary to stabilize the fluorite-type fcc structure. 7 Early studies reported the existence of two different cubic forms of ␦-Bi 2 O 3 solid solutions with Nb 2 O 5 , the so-called ␦-BN SS . The crystal structure of ␦-BN SS is much more complicated than its parent fluorite structure.…”

The exchange interactions and the state of manganese atoms in the solid solutions in Bi3NbO7 of cubic and tetragonal modifications

“…The area of practical application of δ-Bi 2 O 3 is limited by a narrow temperature interval of its thermodynamic stability (730-825°С) [5]. It is possible to stabilize δ-Bi 2 O 3 by partial iso-and heterovalent replacement of bismuth atoms by atoms of transition elements (Y, Nb, Ta, W) or lanthanides (Gd, Er) [6][7][8][9][10]. It is found [11,12] that such solid solutions show mixed electronic and ionic conductivity and are promising for use in electrochemical devices.…”

“…Niobium atoms are located in distorted octahedra of oxygen atoms [9,14]. As a result of examining the crystal structure of bismuth niobate and its solid solutions by the methods of neutron and electron diffraction niobium atoms were found to be distributed in the lattice in a non-statistic manner [9,10,[14][15][16][17][18][19][20][21]. Niobium-oxygen octahedra are combined in chains and blocks via oxygen atoms.…”

Oxygen vacancy configuration of δ‐Bi2O3: an ab initio study

“…1 Introduction δ-Bi 2 O 3 is one of the most technologically important oxide ion conductors, because it can be used as the solid electrolyte material in fuel cells, high-temperature oxygen pumps and many different sensors [1][2][3]. Recently, Bi 2 O 3 -based systems mixed with other oxides have attracted increasing attention, such as Bi-Ln-O (Ln representing rare earth elements) [4,5], Bi 10 Mo 3 O 24 [6], MBi 6 V 2 O 15 (M = Pb, Sr, Ca, Cd, etc.)…”