In this manuscript, we are reporting structural, bonding, optical, dielectric, and electrical properties of Gd-doped ZnO composite samples (Zn<sub>1</sub><sub>−</sub><sub>x</sub>Gd&...In this manuscript, we are reporting structural, bonding, optical, dielectric, and electrical properties of Gd-doped ZnO composite samples (Zn<sub>1</sub><sub>−</sub><sub>x</sub>Gd<sub>x</sub>O, x = 0, 0.05, 0.10) prepared by solid-state reaction method. XRD spectra confirm the wurtzite hexagonal phase with a grain size distribution of 42 - 47 nm. The FT-IR spectra confirm bonding behavior like Zn-O, O=C=O, and O-H stretching modes. FESEM micrographs show that the grains of crystallites possess nearly spherical morphology. Optical absorption spectra confirm that the optical band gap decreases systematically from 3.19 eV to 3.15 eV for x = 0.0 to x = 0.10 samples. For all samples, PL spectra exhibited near-band emission, blue emission, and green emission peaks. The dielectric constant decreases as the applied frequency increases. Hall effect results show that with increasing doping concentration of Gd, mobility and resistivity increase while bulk concentration decreases. Current-Voltage study shows that current increases when temperature is increased. Rare earth-doped ZnO is potential material used for optoelectronics and spintronics device applications. Properties of Gd-doped ZnO are studied by various research groups, but dielectric studies are limitedly reported. Therefore, the present research work aims to study the change of electrical, optical, and dielectric properties of Gd-doped ZnO for device applications.展开更多
Background:For long dietary guidelines,it is recommended to avoid foods rich in saturated fatlike Ghrita,also named clarified butter or ghee,which is considered as the culprit of cardiovascular diseases,diabetes,strok...Background:For long dietary guidelines,it is recommended to avoid foods rich in saturated fatlike Ghrita,also named clarified butter or ghee,which is considered as the culprit of cardiovascular diseases,diabetes,stroke,etc.Contradictory to the modern medical science,Ayurveda advocated for numerous benefits of the usage of Ghrita in the judicious manner.This paper systematically reviews and analyses the scientific researches that carried out on the benefits and harms associated with the usage of Ghrita.Methods and Findings:A search over the various search engines like Pubmed,Google was made.The relevant articles and chapters from books retrieved in English language were saved to a folder and analysed for their utility relevant to the topic and the matter was presented in a systematic manner.Results:Ghrita consisted various fats(saturated,monosaturated and polyunsaturated),fatty acids,minerals,vitamins etc.And the composition of Ghrita varies along with the method of preparation.Scientific researches carried out on Ghrita plain as well as medicated have reported about the depressant effects of medicated Ghrita in gross behavioural tests,potentiated phentobarbitone sleeping time,analgesic effect and stimulatory effect on cognition.Further,studies conducted to evaluate the effect of Ghrita on the serum lipid levels showed a dose dependant decrease in the total cholesterol,low density lipoproteins,and very low density lipoproteins.Ghrita was also reported to have wound healing activity.Conclusion:The results of the study suggest the beneficial effects of plain as well as medicated Ghrita on the various components of health and break the myth associated to the exclusion of Ghrita in diet.These researches also substantiate the claims made by the classical texts of Ayurveda.展开更多
Pure and Antimony (Sb, x = 0.01%, 0.02% and 0.03%) doped Bi0.5Na0.5TiO3 electro ceramics were successfully synthesized by a conventional solid state reaction route. X-ray diffraction analysis showed that a distinct 00...Pure and Antimony (Sb, x = 0.01%, 0.02% and 0.03%) doped Bi0.5Na0.5TiO3 electro ceramics were successfully synthesized by a conventional solid state reaction route. X-ray diffraction analysis showed that a distinct 002/200 peak splitting appears when doping percentage changes from 0.02 to 0.03, referring to a hexagonal symmetry. The data show the Lorentzian deconvolution of the 002 and 200 peaks of the tetragonal phase and the 202 peak of the rhombohedral phase. There is no significant change in the Raman spectra for the prepared compositions while some additional peaks around 151, 281, 585 and 853 cm-1 compared to the peaks observed in BNT. It may be possible that a morphotrophic phase boundary (MPB) exists around x = 0.03. Analysis of peak positions, widths and intensities of Raman spectroscopy study also confirmed the existence of structural change around x = 0.03 composition.展开更多
文摘In this manuscript, we are reporting structural, bonding, optical, dielectric, and electrical properties of Gd-doped ZnO composite samples (Zn<sub>1</sub><sub>−</sub><sub>x</sub>Gd<sub>x</sub>O, x = 0, 0.05, 0.10) prepared by solid-state reaction method. XRD spectra confirm the wurtzite hexagonal phase with a grain size distribution of 42 - 47 nm. The FT-IR spectra confirm bonding behavior like Zn-O, O=C=O, and O-H stretching modes. FESEM micrographs show that the grains of crystallites possess nearly spherical morphology. Optical absorption spectra confirm that the optical band gap decreases systematically from 3.19 eV to 3.15 eV for x = 0.0 to x = 0.10 samples. For all samples, PL spectra exhibited near-band emission, blue emission, and green emission peaks. The dielectric constant decreases as the applied frequency increases. Hall effect results show that with increasing doping concentration of Gd, mobility and resistivity increase while bulk concentration decreases. Current-Voltage study shows that current increases when temperature is increased. Rare earth-doped ZnO is potential material used for optoelectronics and spintronics device applications. Properties of Gd-doped ZnO are studied by various research groups, but dielectric studies are limitedly reported. Therefore, the present research work aims to study the change of electrical, optical, and dielectric properties of Gd-doped ZnO for device applications.
文摘Background:For long dietary guidelines,it is recommended to avoid foods rich in saturated fatlike Ghrita,also named clarified butter or ghee,which is considered as the culprit of cardiovascular diseases,diabetes,stroke,etc.Contradictory to the modern medical science,Ayurveda advocated for numerous benefits of the usage of Ghrita in the judicious manner.This paper systematically reviews and analyses the scientific researches that carried out on the benefits and harms associated with the usage of Ghrita.Methods and Findings:A search over the various search engines like Pubmed,Google was made.The relevant articles and chapters from books retrieved in English language were saved to a folder and analysed for their utility relevant to the topic and the matter was presented in a systematic manner.Results:Ghrita consisted various fats(saturated,monosaturated and polyunsaturated),fatty acids,minerals,vitamins etc.And the composition of Ghrita varies along with the method of preparation.Scientific researches carried out on Ghrita plain as well as medicated have reported about the depressant effects of medicated Ghrita in gross behavioural tests,potentiated phentobarbitone sleeping time,analgesic effect and stimulatory effect on cognition.Further,studies conducted to evaluate the effect of Ghrita on the serum lipid levels showed a dose dependant decrease in the total cholesterol,low density lipoproteins,and very low density lipoproteins.Ghrita was also reported to have wound healing activity.Conclusion:The results of the study suggest the beneficial effects of plain as well as medicated Ghrita on the various components of health and break the myth associated to the exclusion of Ghrita in diet.These researches also substantiate the claims made by the classical texts of Ayurveda.
文摘Pure and Antimony (Sb, x = 0.01%, 0.02% and 0.03%) doped Bi0.5Na0.5TiO3 electro ceramics were successfully synthesized by a conventional solid state reaction route. X-ray diffraction analysis showed that a distinct 002/200 peak splitting appears when doping percentage changes from 0.02 to 0.03, referring to a hexagonal symmetry. The data show the Lorentzian deconvolution of the 002 and 200 peaks of the tetragonal phase and the 202 peak of the rhombohedral phase. There is no significant change in the Raman spectra for the prepared compositions while some additional peaks around 151, 281, 585 and 853 cm-1 compared to the peaks observed in BNT. It may be possible that a morphotrophic phase boundary (MPB) exists around x = 0.03. Analysis of peak positions, widths and intensities of Raman spectroscopy study also confirmed the existence of structural change around x = 0.03 composition.
