Khalid Sultan

Title : Oxygen vacancies based modifications in properties of Sr doped Nd2NiMnO6

Abstract:

In this paper we have discussed about the structural and dielectric properties of Sr doped Nd₂NiMnO₆. There is no effect on the structure of compound Nd₂NiMnO₆ if doped upto the Sr concentration of x=0.3 in Nd_2-xSr_xNiMnO₆ and the observed structure is monoclinic indexed with P2₁/n space group. Raman spectroscopy depicts the existence of disorder in the samples due to Sr doping and a rise in disorder with increase in concentration of Sr has been observed.  All samples have a mixed valence of Ni²⁺, Ni³⁺, Mn²⁺, Mn³⁺ and Mn⁴⁺ associated with oxygen vacancies. Dielectric studies on all the samples show a decrease in dielectric constant as well as dielectric loss with increase in frequency, the usual behavior of polar dielectrics. The temperature effect on the dielectric properties shows an increase with increase in temperature. Conductivity and impedance studies have been investigated for all the three samples of Nd_2-xSr_xNiMnO₆ (x=0.0, 0.1, 0.3) and the results obtained are inter-related with each other.

Audience take away:

• In this talk I will talk about the dielectric properties of oxide double perovskite and their modifications by doping and creating defects.
• By doping the dielectric constant increases and thus the doped compound becomes a potential candidate for energy storage devices
• Researchers can modify this material either by doping with other dopant or depositing thin films of same compound

Biography:

Dr. Khalid Sultan is an Assistant Professor in the Department of Physics, Central University of Kashmir. He has been awarded Ph. D in Solid State Physics from the National Institute of Technology Srinagar. Dr. Khalid has qualified CSIR-NET/JRF twice and is a recipient of various awards, including Bharat Vikas Award 2017 and Best Paper award in JK Science Congress 2013. He is one among the six outstanding students from all over India felicitated by the Honorable President of India. Dr. Sultan has a good research background, and his research interest is in Rare-earth based transition metal oxides and their irradiation study. He has a good number of publications in National and International Journals of repute. He has also completed a major Research project, and another project is in progress. Currently, Dr. Sultan is working on double perovskites and is guiding five Ph. D scholars.