http://localhost:8081/jspui/handle/123456789/124 Wed, 16 Jul 2025 01:48:03 GMT 2025-07-16T01:48:03Z http://localhost:8081/jspui/handle/123456789/16393 Title: FAST IONIC CONDUCTOR FOR LITHIUM-ION BATTERY Authors: Dubey, Brahma Prakash Abstract: Li –ion battery is one of the most promising primary energy storage units for the portable electronic device as well as it will continue to play an incomparable role in sustainable energy future. But Li ion battery still can’t live up to increasing demand of our society due to the low energy density and safety concern despite the decades of development. There are many complexes are associated with the state of art liquid electrolyte because of its flammability and intrinsic volatility. Solid state ionic conductor has received much attention and represents a promising class of material for the next generation high energy density battery. Garnet type super-ionic conductor has emerged as the potential candidate for solid electrolyte owing to their good chemical and thermal stability as well as high conductivity. This dissertation includes my project work on the synthesis and characterization of novel garnet type solid ionic conductor and their properties and applicability in Li-ion battery. The goal of this M.Tech. dissertation is to develop the garnet structured ionic conductor and to generate fundamental understandings with the doping effect of the Nb and Mn on frame of Li7La3Zr2O12 (LLZO) which has been successfully achieved through solid state (ceramic) method. The garnet-structured Al substituted (LLZO) electrolyte surfaces and interfaces properties and multi doping effect is also included and discussed properly in this thesis. The sample Li7La3Zr2O12 and Li6.25Al0.25La3Zr2O12 are synthesized by solid state reaction as well as have made an attempt to understand the structural properties and morphological studies, thermal and chemical stability as well as conductivity measurement of the synthesized samples. The analysis of material properties as structural characterizations is done by Powder X- Ray diffraction (PXRD) technique and morphological studies with the help of Scanning electron microscopy (SEM). We have done TGA/DTA analysis for thermal stability and EDX for the elemental analysis of LLZO. Further FTIR spectroscopy has been done for identification of bonding in the material. For the confirmation of porous nature as well as pore size and its distribution in the material, we have done the BET surface area analysis and at last for the electronic and ionic conductivity measurement, two probe method and Electrochemical impedance spectroscopy (EIS) is performed. Mon, 01 May 2017 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/16393 2017-05-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/16392 Title: MIXERS USING HEMT FOR MICROWAVE APPLICATIONS Authors: Singh, Dharmendra Kumar Abstract: In the communication system microwave circuits are mostly used for wireless communication, while RF mixer is the part of communication circuitry. Mixer mostly used for combining two signals or subtracting two signals. The speed, Isolation at input port and conversion gain of RF mixer plays important role in the receiver. This project work dealing with all the parameters of mixer and trying to improve performance of the mixer. Designing simulation based on ADS key sight 2016 environment with making hardware for this and tested physically circuit performance at appropriate RF and LO frequencies. Nevertheless, applying a local oscillator in place of the operating Frequency increased difficulty. The matching circuitry is so important consideration for mixer designing and trying to simulate with maximum power transferred to the port. Mon, 01 May 2017 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/16392 2017-05-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/16391 Title: PATTERING OF SI WAFERS FOR SOLAR CELL APPLICATIONS Authors: Kumar, Hemant Abstract: In this research, a series of comparative etching experiments on silicon wafers have been carried out using sodium hydroxide (NaOH) for different concentration of isopropyl alcohol (IPA) on (100) orientation p-type silicon wafers. The surface morphology analysis indicates that the specific position of the wafer, with respect to the different concentration of isopropyl alcohol (IPA). Initially etched the silicon wafers by the sodium hydroxide (NaOH) etchant for different concentration of isopropyl alcohol (IPA). Surface morphology of the silicon wafers are measured by the atomic force microscopy (AFM) and scanning electron microscopy (SEM). The height of pyramids, the separation between the two pyramids and regular arrangement of pyramids are different for different concentration of isopropyl alcohol. Average roughness, reflectance spectra, and other optical constant (refractive index and extinction coefficient) spectra are examined for different of concentration of isopropyl alcohol (IPA). Mon, 01 May 2017 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/16391 2017-05-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/16390 Title: SYNTHESIS AND CHARACTERIZATION OF FERRITE BASED NANOSTRUCTURES Authors: Radhesham, Kadgaye Chetan Abstract: The study of the properties of ferrite nanoparticles has attracted considerable interest in recent years because of their importance in the fundamental understanding of physical processes as well as their proposed applications for many technological purposes. So in the present work Magnetite (Fe3O4) and Cobalt ferrite (CoxFe3-xO4 Different characterization techniques like X-ray diffraction (XRD), Field Effect Scanning Electron Microscopy (Fe-SEM), Energy Dispersive X-Ray Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM), UV visible spectroscopy, Vibrating Sample Magnetometer (VSM), etc. were used to study the different properties of the prepared samples. Structural and morphology of ferrite nanoparticles were examined using XRD and Fe-SEM respectively. Chemical structure analysed by FTIR and EDS. Optical characterization is done by UV Spectroscopy. Results of VSM trace the magnetic properties of the both the ferrite samples which were sintered at different temperatures. where x=0.21, 0.47, 0.68 and 1) Nano particles were successfully synthesized by co-precipitation method. Chemical combinations used were the ferric nitrite nonahydrate with potassium chloride for synthesis of the Magnetite, whereas the ferric nitrite nonahydrate with cobaltous nitrate for synthesis of Cobalt ferrite. In all the combinations sodium hydroxide (NaOH, 0.5 M) was used as a hydrolyzing agent which will enable the precipitates formation of the respective ferrites. Subsequently the precipitates of ferrites surpassed the washing and drying stage then they were kept at different sintering temperatures to understand effect of the temperature on the properties of nano particles of respective ferrites. Mon, 01 May 2017 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/16390 2017-05-01T00:00:00Z