Investigation of Nano Size Lead Magnesium Niobate Synthesised by Combustion Method

Abstract

Lead magnesium Niobate, Pb(Mg _1/3 Nb _2/3 )O _3, samples prepared by combustion method with diffrent percentage of fuel, are found to exhibit high sintered density with low particle size (in nano range). A considerable reduction in the concentration of unwanted pyrochlore is achieved by following the combustion method. The temperature dependent XRD study in the range 200–800°C suggests a linear lattice expansion with α _a = 2 × 10 ^{− 6} nm/°C. 100% excess urea as fuel during combustion synthesis gives material with highest room temperature relative permittivity (7080) with low dissipation loss (0.04) vis-à-vis other. The enhanced relative permittivity is due to nano-particles of PMN confirmed by X-ray powder diffraction and scanning electron microscopy.

Keywords:

• Ferroelectrics
• combustion synthesis
• X-ray powder diffraction
• thermal expansion coefficient
• nano powders

Acknowledgments

Authors are thankful to DRDO, New Delhi (INDIA) for providing financial assistance to carry out this work.

Notes

*Present study.