Effect of annealing environments on structural and electrical properties of La0.5Nd0.5MnO3 manganites

• Published in: Materials chemistry and physics 2020-06, Vol.247, p.122833, Article 122833
• Main Authors: Udeshi, Bhagyashree, Gadani, Keval, Rathod, K.N., Boricha, Hetal, Shrimali, V.G., Solanki, Sapana, Zankat, Alpa, Vadgama, V.S., Gal, Manan, Dhruv, Davit, Joshi, A.D., Trivedi, R.K., Solanki, P.S., Shah, N.A.
• Format: Article
• Language: English
• Subjects: Crystallites; Crystallites size; Dielectric; Dielectric relaxation; Dipoles; Electrical properties; Frequency ranges; Lattice vacancies; Magnetic fields; Manganites; Nanostructure; Room temperature; Size effects; Sol-gel processes; Sol–gel; Temperature dependence
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2020.122833

In this communication, structural and electrical properties of rare earth La0.5Nd0.5MnO3 (LNMO) manganites have been studied under the effect of synthesis environments. Nanostructured LNMO samples were prepared by using cost–effective sol–gel method. In order to study the structural properties, θ–2θ X–ray diffraction (XRD) measurement was carried out, for all LNMO samples, at room temperature. Rietveld analysis was carried out to confirm the single phasic nature using fullprof software. The crystallite size was calculated using Scherer's formula. Frequency dependent dielectric response have been carried out using LCR meter in the frequency range of 20 Hz to 2 MHz at room temperature under the applied magnetic field both, H = 0 and 1T. Also, temperature dependent dipole response has been carried for all LNMO samples in the temperature range of 173K–253K. Relaxation mechanism and universal dielectric response (UDR) model have been discussed to understand the dielectric behavior of the samples. Overall, dielectric behavior has been understood in the context of role of size effects and oxygen vacancies in the lattice under the different magnetic field, process temperature and process environments. [Display omitted] •Sol-gel grown LNMO manganite was successfully synthesized under the two different process temperatures.•Effect of two different process conditions on structural and electrical properties.•Variation in dielectric has been discussed using the UDR model and related relaxation mechanisms under magnetic field.•Role of crystallite size in governing dielectric response of LNMO.