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RESEARCH PRODUCT

Structural, microstructural and dielectric studies in multiferroic LaSrNiO4-δ prepared by mechanical milling method

Virgil OptasanuMohamed KhitouniA. CheikhrouhouW. Cheikhrouhou-koubaaA. ChouketO. Bidault

subject

010302 applied physicsMaterials scienceMechanical EngineeringMetals and Alloys02 engineering and technologyDielectricAtmospheric temperature range021001 nanoscience & nanotechnologyMicrostructure01 natural sciencesCrystallographyTetragonal crystal systemMechanics of Materialsvisual_art0103 physical sciencesMaterials Chemistryvisual_art.visual_art_mediumCeramicCrystalliteComposite material0210 nano-technologyPowder diffractionSolid solution

description

Abstract The solid solution LaSrNiO 4-δ has been successfully prepared by a rapid method combining mechanical milling and heat treatment. The structure and microstructure transformations were characterized by X-ray powder diffraction, scanning and transmission electron microscopy. The dielectric property was also investigated. After 10 h of milling and 8 h of heat treatment at 1300 °C, X-ray diffraction analysis revealed LaSrNiO 4-δ single phase, exhibiting tetragonal structure with space group of I4/mmm. This result was confirmed by using the ED pattern for sample using the [001] orientation. The corresponding lattice images show the compound to be well ordered, indicating the absence of stacking faults and the growth of the crystallites. Dielectric relaxation of charge-ordered LaSrNiO 4-δ ceramic was investigated in the temperature range 100–450 K. Giant dielectric response was observed in this ceramic, and only one dielectric relaxation was found on the curve of the temperature dependence of dielectric constant. The thermal activated small polaronic hopping between two charge ordering temperatures should contribute to the giant dielectric response in the present ceramics.

yearjournalcountryeditionlanguage
2016-03-01Journal of Alloys and Compounds
https://doi.org/10.1016/j.jallcom.2015.12.002