Lead-Free Piezoelectric Material – Agnbo3

Kharga, D (2014) Lead-Free Piezoelectric Material – Agnbo3. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

In the present work, silver niobate (AgNbO3), a potential lead-free piezoelectric material has been synthesized by conventional solid-state method. Dielectric and impedance studies of the compound in a wide frequency range and at different temperatures have been studied. Structural analysis confirms the single phase of the compound, with orthorhombic (Pmc21) crystal structure at room temperature. Microstructure and surface property of the sintered compound was investigated, and Raman measurements were also performed with the compound. Variation of dielectric constant with temperature at different frequencies, depicts the phase transitions that the compound undergoes. Frequency dependent studies of impedance Z″ (loss spectrum) shows the existence of strong dispersion in the relaxation time. In order to better understand the relaxation mechanism, Nyquist plots have been studied at temperature, T ≥ 360 0C up to 400 0C. Relaxation time was found to decrease with increase in temperature and obey Arrhenius relationship. Variation in ac conductivity as a function of temperature was studied and activation energy was calculated.

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