Yarı-Katkılı La0.5Ba0.5MnO3 Perovskit Nanoparçacıklarının Yapısal, Morfolojik ve Manyetik Özelliklerinin İncelenmesi

Year 2024, Volume: 9 Issue: 1, 22 - 34, 29.06.2024

Yusuf Samancıoğlu

https://doi.org/10.56171/ojn.1434647

Abstract

Bu çalışma La0.5Ba0.5MnO3 (LBMO) yarı katkılı perovskit manganit bileşiğinde lantan (La) yerine baryum (Ba) yer değişiminin manyetik özellikleri üzerindeki etkisi araştırıldı. Numune sol-jel yöntemi kullanılarak hazırlandı ve 1000°C'de 24 saat ısıl işleme tabi tutuldu. Taramalı elektron mikroskobu (SEM)-enerji dağılım spektroskopi (EDS) analizi LBMO yüzeyinde rastgele BaMnO3 nano çubuk oluşumunu ortaya çıkardı. LBMO perovskit bileşiğinin parçacık boyutu dağılımının yaklaşık 60 nm olduğu bulundu. Ayrıca, analizler sonucunda BaMnO3 nano çubukların genişliği 100-250 nm ve uzunluğu 5-20 μm aralığında değiştiği gözlendi. X-ışını kırınımı (XRD) analizi, ana perovskit bileşiğinin (LBMO) kübik kristal yapıda (a= 3.9108 Å) olup, nano çubukların ise altıgen (a=5.6454 Å, c=4.8224 Å) kristal yapıya sahip olduğu gösterildi. Manyetik özelliklerin ortaya konabilmesi için sıfır alan soğutma (ZFC) ve alan altında soğutma (FC) eğrilerinden yararlanarak Curie sıcaklığını oda sıcaklığına yakın (TC) 323 K olduğu tespit edildi. Mıknatıslanma ölçümleri verileri kullanılarak hesaplanan manyetik entropi değişiminin (−ΔSM), 1 T'de 0,62 J/kgK ve 6 T'de 2,25 J/kgK olduğu bulundu.

Keywords

Yarı katkılı perovskit manganitler, BaMnO3, nanoçubuklar, Curie sıcaklığı

Project Number

BAP Project No: 15/145

Structural, Morphological and Magnetic Investigation of Half-Doped La0.5Ba0.5MnO3 Perovskite Nanoparticles

Abstract

This study investigated the effect of barium (Ba) substitution for lanthanum (La) on the magnetic properties of the half-doped perovskite manganite compound La0.5Ba0.5MnO3 (LBMO). The LBMO sample was prepared via the sol-gel method and sintered in air at 1000°C for 24 hours. Scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDS) analysis revealed random formation of BaMnO3 nanorods on the LBMO surface. The LBMO perovskite exhibited a particle size distribution of approximately 60 nm, while the BaMnO3 nanorods possessed widths ranging from 100-250 nm and lengths between 5-20 μm. X-ray diffraction (XRD) analysis found that the main perovskite compound (LBMO) exhibits a cubic crystal structure (a = 3.9108 Å), while the nanorods (BaMnO3) possess a hexagonal crystal structure (a = 5.6454 Å, c = 4.8224 Å). The Curie temperature (TC) was determined to be approximately 323 K, close to room temperature, zero field cooling (ZFC) and field cooling (FC) curves to elucidate the magnetic properties. Furthermore, magnetization measurements yielded a magnetic entropy change (ΔSM) of 0.62 J/kgK at 1 T and 2.25 J/kgK at 6 T.

Keywords

Half-doped perovskite manganites, BaMnO3, nanorods, Curie temperature

Supporting Institution

Muğla Sıtkı Koçman University-Scientific Research Projects Coordination Unit (BAP)

Project Number

BAP Project No: 15/145

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