Mo6+ Modified (K0.5Na0.5)NbO3 Lead Free Ceramics: Structural, Electrical and Optical Properties

doi:10.1016/j.jmst.2013.10.022

J. Mater. Sci. Technol.

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Mo⁶⁺ Modified (K_0.5Na_0.5)NbO₃ Lead Free Ceramics: Structural, Electrical and Optical Properties

Jyoti Rani¹, Piyush Kumar Patel¹, Nidhi Adhlakha¹, Hemant Singh¹, K.L. Yadav¹, Satya Prakash²

1 Smart Materials Research Laboratory, Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
2 Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, India

Received:2013-05-12 Revised:2013-07-16 Online:2014-05-15 Published:2014-05-15
Contact: K.L. Yadav
Supported by:
Authors acknowledge the financial support from Council of Scientific and Industrial Research, New Delhi India under the research Grant No. 03(1156)/10/EMR II.

Abstract

Abstract:

Lead free polycrystalline ceramics (K_0.5Na_0.5)Nb_(1−x)Mo_xO₃ (x = 0, 0.02, 0.04, 0.06 and 0.08) have been synthesized via solid state reaction method. The formation of single phase perovskite structure up to 6 mol% of Mo⁶⁺ has been confirmed by X-ray diffraction pattern. Impedance spectroscopy reveals that bulk resistance decreases with increasing temperature, which indicates negative temperature coefficient of resistance (NTCR) behaviour of the compounds. The diffuse reflectance spectroscopy results indicate a red shift of the band gap energy of K_0.5Na_0.5NbO₃ (KNN, from 4.28 to 3.61 eV) with increasing Mo⁶⁺ concentration due to structural modification. The photoluminescence spectra of doped samples are composed of two emission bands at room temperature. One emission band is near band edge ultraviolet (UV) emission (∼354 nm) and other is visible emission band (∼397 nm) which may explore the possibility of these ceramics to be used in optical device applications.

Jyoti Rani, Piyush Kumar Patel, Nidhi Adhlakha, Hemant Singh, K.L. Yadav, Satya Prakash. Mo⁶⁺ Modified (K_0.5Na_0.5)NbO₃ Lead Free Ceramics: Structural, Electrical and Optical Properties[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.10.022.

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Mo⁶⁺ Modified (K_0.5Na_0.5)NbO₃ Lead Free Ceramics: Structural, Electrical and Optical Properties

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