Abstract
AbstractLa1−xNaxMnO3 perovskite manganite in the form of circular pellets was prepared with the composition of x = 0.10, 0.15 and 0.20 by the solid-state reaction technique. To confirm the crystalline nature of the samples, X-ray diffraction patterns of the samples were obtained. It is found that the samples have a rhombohedral structure with R3c space group. Particle size was determined from the obtained scanning electron microscope images. Ultrasonic velocity and the attenuation measurements were carried out on the samples employing the transmission technique in the temperature range from 300 to 400 K. The anomalous behaviour obtained in the ultrasonic measurements was used to explore the transition temperature of the prepared La1−xNaxMnO3 perovskite samples. The temperatures 320, 328 and 334 K are the ferromagnetic to paramagnetic phase transition temperatures of the samples x = 0.10, 0.15 and 0.20, respectively.
Highlights
In recent years, advance materials such as perovskite manganite with the general formula R1−x AxMnO3 (R—rare earth element and A—doping elements such as Sr, Ba, Ca, Na and K) assume significant importance in view of their special physical properties such as colossal magneto resistance (CMR), metal–insulator (MI) phase transition and ferromagnetic (FM) to paramagnetic (PM) phase transition (Lalitha & Reddy, 2009; Park et al, 1998; Tokura, 1997)
In this investigation, perovskite manganite samples LNMO10, LNMO15 and LNMO20 were prepared by the solid-state reaction technique
The particle size of the samples was determined from the obtained scanning electron microscope (SEM) images
Summary
Advance materials such as perovskite manganite with the general formula R1−x AxMnO3 (R—rare earth element and A—doping elements such as Sr, Ba, Ca, Na and K) assume significant importance in view of their special physical properties such as colossal magneto resistance (CMR), metal–insulator (MI) phase transition and ferromagnetic (FM) to paramagnetic (PM) phase transition (Lalitha & Reddy, 2009; Park et al, 1998; Tokura, 1997). Besides the DE interaction, there are few other phenomena such as charge and orbital instabilities, electron-lattice, spin-lattice coupling (Millis, 1995; Zheng, Zhu, Xie, Huang, & Zi, 2002), Jahn–Teller (JT) interaction, charge-orbital ordering, AFM super exchange interaction (Chen & Cheong, 1996; Radaelli, Cox, Marezio, & Cheong, 1997) that play a role in their properties
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