SYNTHESIS AND PROPERTIES OF NIOBIUM-, COBALT-SUBSTITUTED SOLID SOLUTIONS OF BISMUTH TITANATE WITH LAYERED PEROVSKITE STRUCTURE
https://doi.org/10.29235/1561-8331-2018-54-2-154-160
Abstract
The Bi4Ti3–2xNbxCoxO12 (x = 0.05, 0.10, 0.15) solid solutions have been synthesized using ceramic method, their crystal structure, thermal expansion, electrical and dielectric properties have been studied. It has been established that Bi4Ti3–2xNbxCoxO12 titanates are p-type semiconductors whose electrical conductivity at low temperatures is higher, but
at high temperatures is lower than for the base Bi4Ti3O12 bismuth titanate. It has been found that partial co-substitution of titanium by niobium and cobalt in Bi4Ti3O12 leads to the increase in the size of the unit cell of the Bi4Ti3–2xNbxCoxO12 solid solutions, a decrease in their Curie temperature, a decrease in the dielectric constant and dielectric losses, and slightly affects the magnitude of their linear thermal expansion coefficient. For Bi4Ti3.8Nb0.1Co0.1O12 and Bi4Ti3.7Nb0.15Co0.15O12 solid solutions, a sharp increase in the activation energy of electrical conductivity has been observed at the transition from the ferroelectric region to the paraelectric region.
Keywords
layered bismuth titanate,
dielectric permittivity,
dielectric losses,
electrical conductivity,
thermo-EMF,
thermal expansion
Supporting agencies: State Program of Scientific Investigations “Physical Materials Sciencs, New Materials and Technolo- gies”
About the Authors
A. I. Klyndyuk
Belarusian State Technological University.
Belarus
Belarus
Andrei I. Klyndyuk – Ph. D. (Chemistry), Associate
Professor.
13A, Sverdlova Str., 220006, Minsk.
E. A. Chizhova
Belarusian State Technological University.
Belarus
Belarus
Ekaterina A. Chizhova – Ph. D. (Chemistry), Associate Professor.
13A, Sverdlova Str., 220006, Minsk.
A. A. Glinskaya
Belarusian State Technological University.
Belarus
Belarus
Anna A. Glinskaya – Ph. D. (Chemistry), Senior Lecturer.
13A, Sverdlova Str., 220006, Minsk.
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