JOURNAL OF FACULTY OF ENGINEERING & TECHNOLOGY, Vol 21, No 1 (2014)

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Structure, Dielectric and Impedance Studies of Li Doped (K0.5Na0.5)NbO3 Ceramics

Muhammad Asif Rafiq, Muhammad Nadeem Rafiq, Furqan Ahmed, Liaqat Ali, Muhammad Yousaf Anwar

Abstract


Polycrystalline, lead free (K0.5Na0.5)NbO3 and (K0.5Na0.5)0.49Li0.02NbO3 ceramics were synthesized using solid-state reaction method. X-ray diffraction studies confirmed the formation of mono-phasic ceramics. During dielectric studies some anomalies were observed around temperatures 155 ºC and 439 ºC for (K0.5Na0.5)0.49Li0.02NbO3. Complex impedance spectroscopy (CIS) technique was used to investigate the bulk (grain interior) and grain boundary contributions to the impedance as a function of temperature and frequency. CIS studies revealed that the electrical relaxation process was temperature dependent and non-Debye type. AC conductivity studies revealed that conductivity was mainly due to the ionized oxygen vacancies in (K0.5Na0.5)0.49Li0.02NbO3 ceramics.


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Faculty of Engineering & Technology

University of the Punjab

Lahore-54590-Pakistan