Structural and magnetic properties of La2Ni1−Co MnO6 compounds
| Autor: | A. Nandy, S. Mukherjee, Debabrata Pramanik, B. Manjunath, Asok Poddar, Shovan Dan, Manabendra Mukherjee, P. A. Joy, Papri Dasgupta, Swapan Kumar Pradhan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Valence (chemistry)
Materials science Mechanical Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Isothermal process Crystallography Ferromagnetism Octahedron X-ray photoelectron spectroscopy Mechanics of Materials Remanence Redox titration 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Materials Research Bulletin. 102:248-256 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2018.01.040 |
| Popis: | Single phase monoclinic La2Ni1−xCoxMnO6 (x = 0.2, 0.4, 0.8) compounds, henceforth, referred as LNCxMO (x = 0.2, 0.4, 0.8) have been prepared by Sol–gel technique. The structural study and redox titration suggest that the samples are both La and O deficient. The generated atomic models using Rietveld refined structural parameters show octahedral distortion in the double perovskite structure. X-ray photoelectron spectroscopy (XPS) study has been used to determine the predominant valence states of Ni, Mn and Co ions. LNCxMO (x = 0.2, 0.4) are found to be Heisenberg ferromagnets whereas LNC0.8MO is a phase segregated system. In LNC0.4MO and LNC0.8MO, at temperatures above TC, χ−1(T) curve shows the characteristics of Griffiths phase. The study of ac susceptibility and isothermal remanent magnetization (IRM) discard the possibility of any glassy state at low temperatures. The antiphase boundaries (APBs), antisite disorders (ASDs) and oxygen vacancies play important roles in this system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect