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Substitution induced magnetic phase transitions and related electrical conduction mechanisms in LaFeO3 nanoparticle.
- Source :
- Journal of Applied Physics; 8/14/2019, Vol. 126 Issue 6, pN.PAG-N.PAG, 12p, 2 Charts, 10 Graphs
- Publication Year :
- 2019
-
Abstract
- The effects of disorder on the magnetic phases as well as on the conduction process are extensively studied in LaFeO<subscript>3</subscript> nanoparticles in a wide field and temperature ranges. The disorder induced by Na in LaFeO<subscript>3</subscript> alters its robust magnetic phase to the coexistence of distinctly different magnetic orders. The phase purity of the samples, which plays an important role, is detected by synchrotron x-ray diffraction. Detailed magnetic measurements are carried out to investigate the evolution of phases due to substitutions. The samples show the coexistence of a superparamagnetic phase along with a weak ferromagnetic phase, and the ratio of the two distinct phases varies with substitutions. The Mössbauer measurement supported the said magnetic phases in the samples. The X-ray photoelectron spectroscopy analysis clarifies the simultaneous presence of Fe<superscript>3+</superscript> and Fe<superscript>4+</superscript> due to Na<superscript>+</superscript> incorporation. Furthermore, the electrical conduction is found to be greatly influenced by such substitutional disorder. From the dielectric measurement, a p-type polaronic conduction mechanism is found in 25% Na incorporation, which is mainly due to the hole hopping between Fe<superscript>4+</superscript> and Fe<superscript>3+</superscript> states. The semicircles in the whole temperature range in the Cole–Cole plots of impedance and modulus spectra are the co-contribution of the grain and the grain boundary effect in the conduction process. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 126
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 138094861
- Full Text :
- https://doi.org/10.1063/1.5097981