Zn0.90Ni0.10O nanoparticles have been synthesized by single-bath two-electrode electrodeposition at constant voltage. X-ray diffraction, UV vis and photoluminescence studies reveal that a single-phase polycrystalline ...Zn0.90Ni0.10O nanoparticles have been synthesized by single-bath two-electrode electrodeposition at constant voltage. X-ray diffraction, UV vis and photoluminescence studies reveal that a single-phase polycrystalline hcp wurtzite crystal structure of ZnO is evolved. The material consists of a large number of defects such as oxygen vacancy (Ov) and zinc interstitial (Zi). The magnetization study reveals that the sample exhibits room-temperature global ferromagnetism and the ferromagnetic ordering seems to be defect induced via bound magnetic polaron mechanism, and double exchange is also expected to have played role. Interesting optoelectronic properties have been found in the synthesized sample and the material seems to be a potential candidate to be used as a UV sensor. Such a transition metal doped ZnO based dilute magnetic semiconducting system exhibiting room-temperature ferromagnetism is likely to be first of its kind in the sense that such materials have not yet been reported to be synthesized by the simple method of electrodeposition to the best of our knowledge on the basis of ample literature review.展开更多
In this paper,we present impedance spectroscopy of Sodium Bismuth Titanate-based materials belonging to(1-x)TNa_(1/2)Bi_(1/2)TiO_(3)-xBaTiO_(3)(x=0.04)(NBT-BT)system.NBT-BT ceramics are prepared by high temperature so...In this paper,we present impedance spectroscopy of Sodium Bismuth Titanate-based materials belonging to(1-x)TNa_(1/2)Bi_(1/2)TiO_(3)-xBaTiO_(3)(x=0.04)(NBT-BT)system.NBT-BT ceramics are prepared by high temperature solid-state reaction method.X-ray diffraction technique showed single-phase polycrystalline sample with an ABO3 perovskite structure.Dielectric behavior and the impedance relaxation were investigated in a wide range of temperature(room temperature(RT)-500℃)and frequency(1 kHz-1 MHz).A broad dielectric constant peak was observed over a wide temperature range around the phase transition temperature.The complex impedance plot exhibited one impedance semicircle identified over the frequency range of 1 kHz-1MHz,which is explained by the grain effect of the bulk.The centers of the impedance semicircles lie below the real axis,which indicates that the impedance response is a Cole-Cole type relaxation.展开更多
基金Project supported by the UGC-DAE,Consortium for Scientific Research,Indore through its CRS project bearing No.CSR-IC/MSRSR-12/CRS-220/2017-18/1301.
文摘Zn0.90Ni0.10O nanoparticles have been synthesized by single-bath two-electrode electrodeposition at constant voltage. X-ray diffraction, UV vis and photoluminescence studies reveal that a single-phase polycrystalline hcp wurtzite crystal structure of ZnO is evolved. The material consists of a large number of defects such as oxygen vacancy (Ov) and zinc interstitial (Zi). The magnetization study reveals that the sample exhibits room-temperature global ferromagnetism and the ferromagnetic ordering seems to be defect induced via bound magnetic polaron mechanism, and double exchange is also expected to have played role. Interesting optoelectronic properties have been found in the synthesized sample and the material seems to be a potential candidate to be used as a UV sensor. Such a transition metal doped ZnO based dilute magnetic semiconducting system exhibiting room-temperature ferromagnetism is likely to be first of its kind in the sense that such materials have not yet been reported to be synthesized by the simple method of electrodeposition to the best of our knowledge on the basis of ample literature review.
文摘In this paper,we present impedance spectroscopy of Sodium Bismuth Titanate-based materials belonging to(1-x)TNa_(1/2)Bi_(1/2)TiO_(3)-xBaTiO_(3)(x=0.04)(NBT-BT)system.NBT-BT ceramics are prepared by high temperature solid-state reaction method.X-ray diffraction technique showed single-phase polycrystalline sample with an ABO3 perovskite structure.Dielectric behavior and the impedance relaxation were investigated in a wide range of temperature(room temperature(RT)-500℃)and frequency(1 kHz-1 MHz).A broad dielectric constant peak was observed over a wide temperature range around the phase transition temperature.The complex impedance plot exhibited one impedance semicircle identified over the frequency range of 1 kHz-1MHz,which is explained by the grain effect of the bulk.The centers of the impedance semicircles lie below the real axis,which indicates that the impedance response is a Cole-Cole type relaxation.
