Abstract
The structural, electric, and magnetic properties of La1−x Na x MnO3 (0.05 ≤ x ≤ 0.35) compounds have been investigated. The compounds were prepared by a standard sol–gel method then sintered at 1400°C for 24 h. The crystal structures were orthorhombic (Pbnm) for all Na concentrations, and the unit cell volumes, determined from the x-ray diffraction data, tended to decrease with increasing Na content. The high-temperature-sintering process resulted in a grainy structure with grain sizes of 5–30 μm. The Curie temperature (T C) increased with increasing Na concentration up to x = 0.20, then decreased with further increase in Na concentration. The maximum magnetic entropy change (−ΔS M) under a field change of 1.6 T was calculated to be ∼3 J/kg K for the sample containing 15% Na.
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Irmak, A.E., Taşarkuyu, E., Coşkun, A. et al. Structural, Electrical, and Magnetic Properties of High-Temperature-Sintered La1−x Na x MnO3 (0.05 ≤ x ≤ 0.35) Compounds. J. Electron. Mater. 44, 326–331 (2015). https://doi.org/10.1007/s11664-014-3514-6
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DOI: https://doi.org/10.1007/s11664-014-3514-6