Dielectric relaxation phenomenon and conductivity in lead-free ceramics

Relaxation phenomena and electric conductivity of (1-x) KNbO3-xK0.5Bi0.5TiO3 system where x = 0, 0.025, 0.05, 0.075, 0.1, 0.2, 0.3 have been studied at high temperature. A relaxation behavior was observed in temperature range 400 K ≤ T ≤ 550 K for orthorhombic solid solutions at room temperature. Th...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2018-09, Vol.545, p.346-351
Main Authors: Krad, Imen, Zaiter, Nissrine, Bidault, Olivier, Megriche, Adel, El Maaoui, Mohamed
Format: Article
Language:English
Subjects:
(1-x)KNbO3-xK0.5Bi0.5TiO3
Ceramics
Conductivity
Dielectric relaxation
Dielectrics
Electric conductivity
Electrical resistivity
High temperature
Lead free
Oxygen
Oxygen ions
Oxygen vacancies
Potassium niobates
Relaxation phenomenon
Solid solutions
Vacancies
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Summary:Relaxation phenomena and electric conductivity of (1-x) KNbO3-xK0.5Bi0.5TiO3 system where x = 0, 0.025, 0.05, 0.075, 0.1, 0.2, 0.3 have been studied at high temperature. A relaxation behavior was observed in temperature range 400 K ≤ T ≤ 550 K for orthorhombic solid solutions at room temperature. The activation energy (Ea) of this phenomenon was range from 0.68 eV for x = 0–0.489 eV for x = 0.075 with τ0 = 10−13 s. The relaxation was attributed to hopping of oxygen vacancies for solid solutions x ≤ 0.075. Substitution by K0.5Bi0.5TiO3 does not affect the electrical conductivity of KNbO3 too much, while the mobility of species such as oxygen vacancies and oxygen ions allow the increase of the conductivity σac at high temperatures. •DPT was show for (1-x) KN-xKBT ceramics.•Two origins of relaxation were detected.•Origin of conductivity at high temperatures.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2018.06.022