Relaxation effects in nonstoichiometric NBT-based ceramics

Politova, ED and Strebkov, DA and Belkova, DA and Kaleva, GM and Panda, PK (2019) Relaxation effects in nonstoichiometric NBT-based ceramics. Defect and Diffusion Forum, 391. pp. 95-100. ISSN 10120386

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Effects of cation nonstoichiomtry on crystal structure parameters, microstructure, and dielectric properties of ceramics (Na0.5+xBi0.5)TiO3 and (Na0.5-xBi0.5)TiO3 with Bi/Na<1 and of solid solutions [(Na0.5Bi0.5)1-xKx]TiO3 and (Na0.5Bi0.5)(Ti1-xMgx)O3 with x = 0 – 0.1 have been studied. Changes in the unit cell parameters and microstructure of the samples observed in ceramics prepared correlate well with both preparation conditions and radii of substituting cations. Ferroelectric phase transitions near ~ 400 K and ~ 600 K were confirmed ib the systems studied. Phase transitions near ~ 400 K demonstrate a pronounced relaxor behavior determined by the presence of polar regions in a nonpolar matrix. Besides, additional anomalies related to presence of relaxing dipoles formed by oxygen vacancies were observed on temperature dependences of dielectric permittivity at temperatures higher than 700 K. The results obtained confirmed that increase in nonstoichiometry lead to increase in ionic conductivity of the samples.

Item Type: Article
Uncontrolled Keywords: Bismuth-Sodium Titanate, Nonstoichiometry, Perovskite Structure, Relaxor Properties
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Nonmetallic Materials
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 20 Jul 2022 09:42
Last Modified: 20 Jul 2022 09:42

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