FTIR and dielectric studies of nickel doped potassium hexa-titanate (K₂Ti₆O₁₃) fine ceramics

Author： Siddiqui Mohd. Chandel Vishal Shariq Mohammad Azam Ameer

ISSN： 0957-4522

Source： Journal of Materials Science: Materials in Electronics, Vol.24, Iss.12, 2013-12, pp. : 4725-4731

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Abstract

The dielectric and electrical properties such as relative permittivity $$(varepsilon^{prime } )$$ $({&egr;}^{'})$ , loss tangent (tanδ), and ac conductivity (σ_ac) have been studied in the temperature range 373–773 K at three different frequencies 100, 200, 400 kHz for doped potassium hexa-titanate (K₂Ti₆O₁₃) samples. It was observed that dielectric constant and loss tangent decreases while ac conductivity increases with the increase in frequency. The temperature dependent relative permittivity showed a phase transition for all samples. Dielectric loss mechanism was observed to include space charge polarization and dipole orientation. Moreover, electron-hopping conduction was observed to be dominant in the low temperature region, whereas intratunnel ionic conduction prevailed at higher temperatures. Fourier transform infrared spectroscopy analysis was also carried out to identify the chemical bonds present in the specimens.