Abstract
AbstractIn this present work, nanocrystalline powders of Pb-doped LaMnO3 or La0.64Pb0.36MnO3 (LPMO) have been synthesized with various grain sizes by a solid-state reaction method followed by ball milling technique. Based on the dependence of crystallite size, the magnetic properties of the LPMO nanoperovskites have been investigated. The nanoperovskites have been structurally characterized. Further, the synthesized nanoperovskite manganite materials with various grain sizes are systematically studied for ultrasonic longitudinal velocity (UL), shear velocity (US) and longitudinal and shear attenuation (αL and αS) in wide range of temperatures. All the nanoperovskites revealed an anomalous behaviour in concern with ultrasonic velocities and attenuation towards the phenomenon of phase transition.
Highlights
Perovskite manganites have been the subject matter of a large number of studies due to their exotic property (Arulraj, Dinnebier, Carlson, Hanfland, & van Smaalen, 2007; Jin et al, 1994; Martin, Chu, & Ramesh, 2010; Xu, Meier, Das, Koblischka, & Hartmann, 2002) along with extraordinary structural, electrical and magnetic properties
This research work addressed the investigation of grain size effect on phase transition and structural properties of LPMO nanoperovskite samples towards ultrasonic studies
The LPMO nanoperovskite samples are prepared by solid-state reaction followed by the ball milling method
Summary
Perovskite manganites have been the subject matter of a large number of studies due to their exotic property (Arulraj, Dinnebier, Carlson, Hanfland, & van Smaalen, 2007; Jin et al, 1994; Martin, Chu, & Ramesh, 2010; Xu, Meier, Das, Koblischka, & Hartmann, 2002) along with extraordinary structural, electrical and magnetic properties. La1−xPbxMnO3 (LPMO) perovskite manganite demonstrates a ferromagnetic metallic phase at room temperature besides large magnetoresistance. Due to their unique physicochemical and large giant magnetoresistant properties, LPMO nanophase manganites have shown potential for a wide range of applications such as magnetic field sensors, piezoelectric transducers and actuators, ultrasonic devices, fuel cells, infrared devices, magnetic reading heads for memory devices and non-volatility memory devices and microwave active components (Ling et al, 2005; Ramesh Babu et al, 2009; Zhang et al, 2006). A systematic study has been made on ultrasonic longitudinal velocity (UL), shear velocity (US) and longitudinal and shear attenuation (αL and αS) in nanostructured LPMO perovskites manganite materials for different grain sizes with wide range of temperatures. The structural properties along with the morphology of the prepared LPMO nanoperovskite samples have been characterized using different techniques
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