The nanocrystalline samples of Nd1-xSrxMnO3 （NSMO） （x=0.5, 0.55, 0.60, 0.63） were synthesized by sol-gel based polymeric pre-cursor route. Structural, magnetic and magnetotransport properties were studied systemat...The nanocrystalline samples of Nd1-xSrxMnO3 （NSMO） （x=0.5, 0.55, 0.60, 0.63） were synthesized by sol-gel based polymeric pre-cursor route. Structural, magnetic and magnetotransport properties were studied systematically. It was found that in the composition range （x=0.50-0.63）, Nd1-xSrxMnO3 showed paramagnetic to ferromagnetic （PM-FM） transition in the vicinity of TC～270 K but the FM phase was weakened as the Sr concentration increased. The appearance of weak ferromagnetism was explained in terms of the core-shell model. More-over, for x=0.63 sample, a second transition is observed below TC at T=185 K, which is possibly due to the appearance of A-AFM/ C-AFM or a mixture of both the phases. Resistivity vs temperature （ρ-T） curve showed that the resistivity of all the samples was much larger than the sin-gle crystals of corresponding compositions due to large contribution of the grain boundaries in the present nanocrystalline samples. In all samples, extrinsic kind of MR behavior dominated because of nanocrystalline nature of the samples, which was nearly of the same order （～10%） in all samples. However, the intrinsic kind of MR behavior was also significant in x=0.50 sample, because of the strongest FM feature in this sample.展开更多
In the present work, acoustoelectric effect in bone has been investigated. Rectangular bone samples prepared from the middiaphysis of the wall of animal bone are exposed by ultrasonic field having frequency of 2.5 MHz...In the present work, acoustoelectric effect in bone has been investigated. Rectangular bone samples prepared from the middiaphysis of the wall of animal bone are exposed by ultrasonic field having frequency of 2.5 MHz. The bone matrix changes under ultrasound exposure which results into the generation of potential in bone. The present study may be helpful in the development of acousto-elcctric devices.展开更多
This paper reviews the studies on acoustoelectric effect in extrinsic semiconductor materials used in various scientific and other measurements. A historical review of earlier findings is given with special reference ...This paper reviews the studies on acoustoelectric effect in extrinsic semiconductor materials used in various scientific and other measurements. A historical review of earlier findings is given with special reference to associated mechanisms. Acoustoelectric studies in solid state devioes require further attention and the work done in this area is also discussed.展开更多
文摘The nanocrystalline samples of Nd1-xSrxMnO3 （NSMO） （x=0.5, 0.55, 0.60, 0.63） were synthesized by sol-gel based polymeric pre-cursor route. Structural, magnetic and magnetotransport properties were studied systematically. It was found that in the composition range （x=0.50-0.63）, Nd1-xSrxMnO3 showed paramagnetic to ferromagnetic （PM-FM） transition in the vicinity of TC～270 K but the FM phase was weakened as the Sr concentration increased. The appearance of weak ferromagnetism was explained in terms of the core-shell model. More-over, for x=0.63 sample, a second transition is observed below TC at T=185 K, which is possibly due to the appearance of A-AFM/ C-AFM or a mixture of both the phases. Resistivity vs temperature （ρ-T） curve showed that the resistivity of all the samples was much larger than the sin-gle crystals of corresponding compositions due to large contribution of the grain boundaries in the present nanocrystalline samples. In all samples, extrinsic kind of MR behavior dominated because of nanocrystalline nature of the samples, which was nearly of the same order （～10%） in all samples. However, the intrinsic kind of MR behavior was also significant in x=0.50 sample, because of the strongest FM feature in this sample.
文摘In the present work, acoustoelectric effect in bone has been investigated. Rectangular bone samples prepared from the middiaphysis of the wall of animal bone are exposed by ultrasonic field having frequency of 2.5 MHz. The bone matrix changes under ultrasound exposure which results into the generation of potential in bone. The present study may be helpful in the development of acousto-elcctric devices.
文摘This paper reviews the studies on acoustoelectric effect in extrinsic semiconductor materials used in various scientific and other measurements. A historical review of earlier findings is given with special reference to associated mechanisms. Acoustoelectric studies in solid state devioes require further attention and the work done in this area is also discussed.
