J.Karthik is a Doctoral Research Scholar from School of Mechanical and Building Sciences VIT University, Chennai Campus India. He has worked as an Assistant Professor in Department of Aeronautical Engineering for 2.5 years. He is one of the academic medalists in his Post Graduate Studies and published research paper in Springer Notes and various conferences. Currently he is doing his Doctoral Research in Energy Harvesting from Smart Structures at VIT University, Chennai,India.
The recent trends in electro-mechanical technology have created a demand for low power consuming and efficient technologies to cater the needs of Industries. Energy harvesting using piezoelectric devices is one of possible way to accomplish this short term goals. The application of Piezoceramic materials is unanimously increasing in areas of Energy harvesting as it has minimum weight and appealing efficiency. In this paper we are comparing Piezoceramic material as a Single crystal and Series of Piezoceramic crystals are crystal placed in a cantilever beam are tested under excitation in a Subsonic Wind tunnel. Cantilever beam when subjected to airflow vibrates in lateral axis along with Piezoceramic crystals which produces an electrical response. The electrical response are recorded in an Oscilloscope and plotted to compare their characteristics and evaluate the maximum voltage generated for a particular force of vibration. Piezoceramic material used for our research is Brass coated with Zinc which is used in electrical buzzers. Wind Tunnel which is used for exciting the crystals is a subsonic wind tunnel and maximum speed input is 1200 rpm. From this paper we can able to compare the efficiency of electrical response of Single and Series Piezoceramic crystals under excitation
Dr. P.S. Solanki has completed his Ph.D. in 2010 from Saurashtra University, Rajkot, India and he has been selected as Fast Track Young Scientist under Department of Science and Technology (DST), New Delhi, India. Presently, he is an Assistant Professor in Physics at Department of Physics, Saurashtra University, Rajkot, India. He is working in the field of ceramic manganite and multiferroic based thin film devices for spintronic based potential applications. He has published 41 research articles in internationally and nationally reputed high impact journals.
Manganites are oxide ceramics having the general chemical formula: R1-xAxMnO3 (R is the rare earth ions and A is monovalent / divalent / trivalent / tetravalent ions) with ABO3 type perovskite structure. Manganites are known to exhibit metal – insulator transition temperature (TP), ferromagnetic – paramagnetic transition temperature (TC), magnetoresistance (MR), charge ordering (CO), orbital ordering (OO), spin ordering (SO), different ground electronic – magnetic states, etc which have been understood on the basis of zener double exchange (ZDE) mechanism, Jahn – Teller (JT) effect, charge – spin – lattice – orbital couplings, etc. In this communication, we report the results of the studies on manganite based LaMnO3– / La0.7Ca0.3MnO3 / LaAlO3 (LMO / LCMO / LAO) thin film composite fabricated by low cost and vacuum free chemical solution deposition (CSD) method. Presently studied bi-layered thin film composite was studied by X-ray diffraction (XRD) measurements for structural properties which reveal that two layers of composite, i.e. LMO and LCMO, are grown in parallel epitaxial orientations. Temperature dependent current – voltage (I – V) characteristics have been investigated for transport properties suggesting the transition from normal to backward diode like characteristics of the LMO / LCMO junction. This transformation strongly depends upon an applied voltage and temperature. Electric field dependent electroresistance (ER), recorded at different temperatures, has been discussed on the basis of various phenomena such as charge injection mechanism, tunneling phenomenon, depletion region modifications and thermal processes across LMO / LCMO interface.