Correlation between structure and Rayleigh parameters in the lead-free piezoceramic (1-x)Ba(Ti0.88 Sn0.12)O3-x(Ba0.7Ca0.3)TiO3

Composition dependent Rayleigh and structural analysis was carried out on the lead-free piezoceramics (1-x)(BaTi0.88Sn0.12)-x(Ba0.7Ca0.3)TiO3 at room temperature. The system exhibits tetragonal (P4mm) structure for x > 0.21, rhombohedral (R3m) for x < 0.13 and orthorhombic (Amm2) for 0.13<x<0.21. Rayleigh analysis suggests that the irreversible contribution to the dielectric response is enhanced in the single phase orthorhombic compositions in the vicinity of the R3m-Amm2 and Amm2-P4mm phase boundaries, and not in compositions exhibiting phase coexistences (x = 0.12 and 0.22). We also found a correspondence between the irreversible Rayleigh parameter and the coercive field in this system.Comment: 18 pages 5 figure

Tuning photoluminescence response by electric field in the lead-free piezoelectric Na1/2Bi1/2TiO3-BaTiO3

We show that an electrically soft ferroelectric host can be used to tune the photoluminescence (PL) response of rare-earth emitter ions by external electric field. The proof of this concept is demonstrated by changing the PL response of Eu+3 ion by electric field on a model system Eu-doped 0.94Na1/2Bi1/2TiO3-0.06BaTiO3. We also show that new channels of radiative transitions, forbidden otherwise, open up due to positional disorder in the system, which can as well be tuned by electric field.Comment: 13 pages 5 figure

Magnetic field driven enhanced ferroelectric switching in self-grown ferroelectric-ferromagnetic composite in the BiFeO3-BaTiO3 multiferroic alloy system

Over the years attempts have been made to compensate for the inherent weaknesses in the bulk state of the multiferroic BiFeO3, such as high leakage current and the absence of ferromagnetic correlation, and exploit its magnetoelectric potential by forming solid solutions with other perovskites. Studies in the recent few years have shown that alloying of BiFeO3 with BaTiO3, both with and without additives, can induce both ferroelectric and ferromagnetic switching. While the coexistence of both the ferroic orders is encouraging from the view point of technological applications, the origin of ferromagnetism in this system remains elusive. Here, we synthesized such compositions and carried out a detailed structural analysis employing magnetic separation of the powder particles. We found that the origin of ferromagnetism lies in the spontaneous precipitation of a minor ( ~ 1 wt %) barium hexaferrite (BaFe9O19) phase, often undetected in routine x-ray diffraction studies of powders sampled from the entire specimen. We also demonstrate that inspite of the insignificant fraction the ferrimagnetic phase, this self-grown composite exhibit noticeably enhanced ferroelectric switching in the presence of external magnetic field. We obtained a dc magnetoelectric coupling of ~ 9 x 10-8 s/m, a value which is comparable to what has been reported for layered ferroelectric/ferromagnetic laminates and bilayer thin film ferroelectric-ferromagnetic hetrostructures. Our study suggests that reasonably large magnetoelectric coupling is realizable in simple 0-3 ferroelectric-ferromagnetic bulk composites provided synthesis strategies are developed which induces spontaneous precipitation of the ferromagnetic phase in small volume fraction to ensure good insulating behaviour of the composite thus developed.Comment: 21 pages, 7 figure

A Novel Approach to Increase Amperometric Biosensors Response

The scope of this chapter is the advancements made in the area of amperometric biosensors. The main important discussion aspect is optimizing the biosensor’s response. This paper deals with mathematical model for amperomatric Biosensor’s outer perforated membrane in two dimensional (2-D) spaces. This model is based on reaction-diffusionmechanism. Model is consists of two layers, enzyme layer and selective layer. Our aim is to increase the accuracy of the biosensor response simulated by using 2-Dmodel. To solve numerically, finite volumemethod is to be used. The biosensor response and the current density are investigated by changing themodel parameter. We are using theMichaelis–Menten kinetics of an enzymatic reaction, which are nonlinear in nature. A novel approach ofmathematicalmodel is very useful in the detail study of substrate conversion. Mathematical modeling is nothing but a virtual experiments which is cost efficient throughwhich immense kind of scientific analysis and prediction is possible. Relative influence of model parameters is dictated by a non-dimensional number called Damkohler number, which stated as ‘the rate of enzymatic reaction to the rate of diffusion’. Our main focus is to analyse current density aftereffect of Damkholer number. Prior to our knowledge the current density of amperometric biosensors varies proportional in accordance with the concentration gradient of the reaction product at the electrode surface. And the current density of amperometric biosensors is proportional to the concentration gradient of the reaction product at the electrode surface

Explaining customer’s continuance intention to use mobile banking apps with an integrative perspective of ECT and Self-determination theory

Digital payments evolve as the next generation system to take over the global commerce landscape in the same manner in which internet and mobile telephony had dominated the traditional communication domains. The use of mobile banking apps has spurred the digital medium across the globe and resulted in a fundamental shift in retailing practices. The purpose of this paper is to comprehend various factors influencing the customer’s continuance intention-behavior to use mobile banking apps. In this study, we developed a research model that encompasses the attributes of Expectation confirmation theory (ECT) and Self-determination theory (SDT). The research model was tested using survey data collected from 744 respondents across various demographics and analyzed using structural equation modeling (SEM) to understand the usage behavior of mobile banking apps in a multi-faceted business environment. The various hypothesis of the research model indicate that mobile banking apps continuance intention usage behavior is strongly influenced by the satisfaction, intrinsic and identified regulations, whereas satisfaction is influenced by the expectation-confirmation, trust, and quality. The research findings reveal that, “An enormous potential are available for marketing managers and researchers to tape these opportunities and plan for continual and sustainable growth of mobile banking apps. “ Available at: https://aisel.aisnet.org/pajais/vol10/iss2/5

Comparison of Multi-Criteria Decision Making Methods for Multi Optimization of GTAC Process Parameters

A great deal of investigation on gas tungsten arc cladding (GTAC) is focused on the study of enhancements in the microstructure, mechanical and tribological features of the cladding. The selection of right process parameters is a critical issue for the researchers. Decision makers in the industries must analyze a wide variety of parameters based on a set of contradictory criteria. Several multi-criteria decision-making (MCDM) techniques are now available to add values in selection of these parameters. The application of the TOPSIS and MOORA techniques to identify the best configuration of processing parameters in the gas tungsten arc cladding (GTAC) process is investigated in this work. The best processing parameters set for the multiple performance attributes should be welding current: 70 amp, speed: 240, argon flow: 13 and standoff distance 3.5 (TOPSIS-PCA) and welding current: 50, speed: 300, argon flow: 13 and standoff distance 3.5 (MOORA-PCA).A comparison of MOORA-PCA and TOPSIS-PCA demonstrates the superiority of TOPSIS over MOORA technique. The prediction accuracy of the TOPSIS-PCA hybrid approach model is found better than MOORA-PCA technique