The possibility of solid-phase synthesis of multicomponent bismuth niobates and tantalates with pyrochlore-type structure (sp. gr. Fd-3m), containing atoms of transition 3d-elements in equimolar quantities is shown. The composition of this type pyrochlores can be described by stoichiometric formula Bi2Cr1/6Mn1/6Fe1/6Co1/6Ni1/6Cu1/6Ta(Nb)2O9 ± ?. A feature
of synthesis of pyrochlores is a multi-stage high-temperature heat treatment process at a temperature of 650, 850, 950, 1050 °С for 60 hours. In the case of bismuth tantalate based pyrochlore, impurity phase of triclinic bismuth orthotantalate ?-BiTaO4 (sp. gr. P-1) is formed in trace amounts (? 8 mol.%). Complex pyrochlore based on bismuth niobate is characterized by a dense, low-porous microstructure in contrast to loose, porous tantalum pyrochlore with an average grain size of ? 2 µm. The unit cell parameter for pyrochlores containing niobium and tantalum is 10.4927(10.4922) ?, respectively.
Kristina N. Parshukova – bachelor of Chemistry Department, Syktyvkar State University, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Elena P. Rylchenko – bachelor of Chemistry Department, Syktyvkar State University, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Vitaly A. Muravyov – bachelor of Chemistry Department, Syktyvkar State University, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Ksenia A. Badanina – bachelor of Chemistry Department, Syktyvkar State University, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Boris A. Makeev – Candidate of Geological-Mineralogical Sciences, Researcher at the Laboratory of Mineralogy of the Institute of Geology FRC Komi SC UB RAS, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Roman I. Korolev – Senior Lecturer, Department of Radiophysics and Electronics, Syktyvkar State University, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Nadezhda A. Zhuk – Candidate of Chemical Sciences, Associate Professor, Senior Researcher of Laboratory of Ceramic Materials Science, Syktyvkar State University, Syktyvkar, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
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