http://nopr.niscair.res.in/handle/123456789/7603 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/10875 Title: Effect of sintering temperature on structural and electrical properties of BiFeO₃ multiferroics <br/> <br/>Authors: Pandu, Ratnakar; Yadav, K L; Kumar, Amit; Reddy, P Ravinder; Gupta, A V S S K S <br/> <br/>Abstract: Polycrystalline samples of BiFeO₃ are synthesized at low temperature using sol-gel technique. From the XRD analysis it is seen that crystallite size increases and the strain in the crystallites decreases with increasing sintering temperature. As the crystallite size increases with increasing temperature the lattice parameter (<i style="">a_R</i>) decreases. SEM micrographs show that the samples are homogeneous. It is also confirmed from the SEM micrographs that the grain size increases with increasing sintering temperature. Analyzing the SEM micrographs it can be concluded that the particle size follows the Gaussian distribution. Ferroelectric to paraelectric transition temperature (<i style="">T</i>_c) is detected by DTA analysis, which shows that the Curie temperature of pure BiFeO₃ is 814°C which is very close to the ideal value (827°C) found by dielectric measurement. <br/> <br/>Page(s): 481-485 http://nopr.niscair.res.in/handle/123456789/10874 Title: Synthesis of NiO nano crystals through nitrate eutectic melt <br/> <br/>Authors: Rastogi, R P; Singh, N B; Shukla, S K <br/> <br/>Abstract: Nanostructured materials are of considerable interest in both fundamental as well as applied research areas due to their unique physical and chemical properties and also promising applications in nanodevices. In recent years, variety of nanomaterials have been prepared by using different methods. Molten nitrates and particularly nitrate eutectic melts, because of low melting temperatures, are frequently used as nonaqueous solvents for studying a number of chemical reactions and preparation of materials. Nano size nickel oxide (about 15 nm) has been prepared by the reaction of nickel sulphate in NaNO₃- KNO₃ eutectic melt. The specific reaction conditions for the preparation of nano size NiO have been specified using TG and DTA techniques. NiO produced has been characterized by X-ray powder diffraction (XRD) and scanning electron microscopic (SEM) techniques. Probable reaction mechanism for the reaction has also been proposed. <br/> <br/>Page(s): 477-480 http://nopr.niscair.res.in/handle/123456789/10873 Title: Tensile behavior of glass fiber reinforced plastics subjected to different environmental conditions <br/> <br/>Authors: Agarwal, A; Garg, S; Rakesh, P K; Singh, I; Mishra, B K <br/> <br/>Abstract: Glass fiber reinforced plastic (GFRP) composites are being used in a large number of diverse applications ranging from aerospace to sports equipment. The mechanical and environmental characterization of these materials is necessary to further enhance their application spectrum. GFRP composites are subjected to different working environments when put into service. The mechanical behavior of polymeric matrix composites in particular is affected by the environmental conditions. There is an imminent need to investigate the mechanical behavior of these materials when subjected to various types of environments for different exposure times. The objective of the present research endeavor is to characterize the tensile behavior of the GFRP composites when exposed to brine, acid and base solution, Ganga water, freezing conditions and kerosene oil for four different exposure times. The experimental results show that the tensile strength of GFRP plates is affected at different levels when subjected to selected environmental conditions for various exposure times. <br/> <br/>Page(s): 471-476 http://nopr.niscair.res.in/handle/123456789/10872 Title: Influence of cutting parameters on thrust force and torque in drilling of E-glass/polyester composites <br/> <br/>Authors: Jayabal, S; Natarajan, U <br/> <br/>Abstract: This paper discusses the influence of cutting parameters in drilling of glass fiber reinforced composites. The experiments are conducted to study the effect of point angle, spindle speed and feed rate on thrust force and torque using HSS twist drills. This paper presents a mathematical model for correlating the interactions of drilling parameters and their effects on thrust force and torque. The optimum value of cutting parameters is also determined to get minimum value of thrust force and torque. <br/> <br/>Page(s): 463-470