Effect of doping with iron and magnesium on high-temperature stability and physicochemical properties of bismuth tanalates
Nekipelov S.V.
1,2, Zhuk N.A.
2, Krzhizhanovskaya M. G.
3, Sivkov V.N.1
1Komi Science Centre of the Ural Division of the Russian Academy of Sciences
2Syktyvkar State University, Syktyvkar, Russia
3St. Petersburg State University, St. Petersburg, Russia
Email: NekipelovSV@mail.ru, nzhuck@mail.ru, krzhizhanovskaya@mail.ru, SivkovVN@mail.ru
Bismuth tantalum pyrochlores doped with iron and magnesium atoms were obtained thermally stable up to a temperature of 1140oC: Bi2MgxFe1-xTa2O9.5-Δ (x=0-1). The effect of Fe and Mg codoping on their crystal structure has been studied. The unit cell parameter of solid solutions increases uniformly from 10.4871(2) Angstrem (x=0) to 10.54607 Angstrem (x=1). According to the XPS and NEXAFS spectroscopy data, it was found that the ions in these solid solutions are in the charge states Bi(+3), Mg(+2), Fe(+3), Ta(+5-δ). The dopant atoms iron and magnesium are introduced into the positions of the tantalum atom without distorting the symmetry of the crystal lattice. Keywords: bismuth tantalates, pyrochlores, XPS, NEXAFS.
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