الأسس الفلسفية لأسلوب الحياة الإسلامية وغير الإسلامية وأثرها فى المجتمع: دراسة مقارنة

Philosophical Foundations of Islamic and Un-Islamic Pattern of Life and its Impact upon Society: A Comparative Study It is self-evident that human beliefs had great influence on character, actions, ethics, behavior and way of life. The possessors of correct belief produced positive effects and those who possessed incorrect belief promoted negative values in the community. Undoubtedly, the diversity in belief produced diverse ethics, actions, behaviour which gave birth to the different patterns of life in society. Regardless of subdivisions, by looking towards the philosophical foundations, these patterns of life could be divided into four categories in the light of the Qur’an and Sunnah. These lifestyles (also mentioned by Abū ’l-A‘lā Maudūdī in Tajdīd wa Iḥyā-i Dīn) are: Atheistic pattern of life, Polytheistic pattern of life, Monastic pattern of life and Islamic pattern of life. As each pattern had its particular tenets, therefore it formed a particular way of life by leaving its effects upon individual, social, political, economic, cultural and civilizational life. This research work aimed to explain the basic mechanism of these four patterns and their impact on human life. The method used for the collection and analysis of data was descriptive and analytical. The research concluded that three patterns of life (except Islamic pattern of life) produced harmful and negative effects into the society whereas the only Islamic pattern of life ensured the peace and prosperity. Moreover, Islamic pattern of life played a vital role in growth of all disciplines including political social, and economic system. It is therefore suggested that Islamic scholars should uncover the hollowness of Un-Islamic life style and present Islamic pattern of life in logical and systematic way. On one hand, this exercise will encounter the evils and on the other hand would promote good into the society.

Correlation of Crystal Structure and Dielectric Characteristics of Pyrochlore Based Oxides

Rare earth-based materials with pyrochlore structure have shown a potential for practical applications due to their stable crystal structure with tunable lattice parameters. Pyrochlore structure-based compounds have shown valuable interest in practical applications because of their structure tunability and stability. In this context, the stability of pyrochlore structure in a particular phase is quite essential for practical optimization of valuable dielectric, impedance and other multifunctional characteristics of rare-earth pyrochlores. This work contains a successful synthesis of pure phase pyrochlore based compounds including zirconates and niobates, with A and B-site substitution to determine their structural tunability and its effects on dielectric and other multifunctional properties. These rare-earth based pyrochlores not only show practically viable dielectric characteristics but also have significant ferroelectric and magnetic features. Most of the pyrochlores show disordered magnetic structure and have not been investigated properly yet. In this context, following detailed study of these thermally stable pyrochlores has been accomplished for their practical applications. A wet chemical sol-gel technique was utilized to synthesize pure phase pyrochlores. This method was found feasible, energy efficient and cost effective. Diffraction studies using X-rays revealed their stable pyrochlore structure with Fd ̅m space group. Structural tunability through A and B-site substitution was confirmed through Rietveld refinement. Perfect fitting and low residual factors from refinement prove the synthesis of pure phase pyrochlores. Calcination temperature of 1200 °C for 1 h was found to be the most favorable condition for the synthesis of these highly complex metal oxides. Field emission scanning electron microscopy operated in different operating modes at several voltages has confirmed the growth of nanoparticles with substitution, promoting the densification of the prepared ceramics. This densification led us to study the energy storage capability of these materials as they have already shown good ferroelectric properties. To check the variation in recoverable energy density of the material under consideration, the charge-discharge curves were plotted at different field strengths to study the recoverable energy density, energy loss density and energy storage efficiency as a function of applied field. Furthermore, magnetic properties of these pyrochlores were determined through vibrating sample magnetometer. Superparamagnetic effect was found in these pyrochlores with reasonably good magnetic susceptibility and small coercive fields. In addition, the variation in magnetic properties was also related to the particle size which showed that the maximum magnetization increases with decrease in particle size. Lastly, the magneto-dielectric study has been performed. The study of relative change in dielectric properties of the material with change in external magnetic field is called magneto-dielectric analysis. This analysis is actually the investigation of coupling between the magnetic properties of the material with its dielectric characteristics. Magneto-dielectric analysis exposed that dielectric behavior of the samples is influenced inversely with the application of external magnetic field. Negative behavior of magneto-dielectric coefficient can be understood on the basis of application of external magnetic field randomizes the electric dipoles present in the material which usually follow the external applied electric field. This study was also explained on the basis of Maxwell-Wagner‟s model.