Sains Malaysiana 48(2)(2019): 369–375

http://dx.doi.org/10.17576/jsm-2019-4802-14

Growth and Magnetic Behaviours of La_0.7Sr_0.3MnO₃ Nanoparticles Synthesized via Thermal

Treatment Method

(Tingkah Laku Pertumbuhan dan Magnetik Nanopartikel La_0.7Sr_0.3MnO₃ Disintesis melalui Kaedah Rawatan Terma)

PAN KAI YAP, ABDUL HALIM SHAARI*, HUSSEIN BAQIAH, CHEN SOO KIEN, JUMIAH HASSAN, MOHD MUSTAFA AWANG KECHIK, LIM KEAN PAH & ZAINAL ABIDIN TALIB

Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

Received: 16 July 2018/Accepted: 20 September 2018

ABSTRACT

La_0.7Sr_0.3MnO₃ (LSMO) nanoparticles were synthesized by thermal treatment method using water as solvent and polyvinyl pyrollidone (PVP) as capping agent. The as prepared precursor was calcined at various temperatures ranging from 500°C to 1000°C. Structural characterization using X-rays diffractions (XRD) showed that the LSMO nanoparticles, calcined at temperature ≥ 600°C, have single phase of La_0.7Sr_0.3MnO₃ with rhombohedral crystal structure without any secondary phases being detected. The average particle size of nanoparticles increased gradually from 23 to 163 nm for samples calcined at 500 to 1000°C. Magnetic measurement at room temperature using vibrating sample magnetometer (VSM) indicated that the LSMO nanoparticles had soft ferromagnetic behaviour with coercivity ranged from 3.43 to 33.78 G. The magnetic saturation (Ms) of nanoparticles increased with the increment of particle size. From Electron Spin Resonance (ESR) measurement, the g-value of LSMO nanoparticles increased with the increasing of calcination temperature. The ESR indicated a coexistence of ferromagnetic and paramagnetic phases in LSMO nanoparticles below Curie temperature (T_c). The T_c was in the range of 50-80°C for LSMO calcined at 500°C and it is in the range of 80-110°C for LSMO calcined 600, 700, 800, 900, and 1000°C.

Keywords: Electron resonance; magnetic properties; nanostructures; Rietveld analysis; thermal treatment

ABSTRAK

Zarah nano La_0.7Sr_0.3MnO₃ (LSMO) telah disintesis melalui kaedah rawatan terma menggunakan air sebagai pelarut dan polivinil pirolidon (PVP) sebagai agen penyalutan. Prekursor yang disediakan telah melalui pengkalsinan pada suhu yang berbeza dari 500°C hingga 1000°C. Pencirian struktur menggunakan pembelauan sinar-X (XRD) mendedahkan bahawa zarah nano LSMO, dikalsinkan pada suhu ≥ 600°C, mempunyai struktur fasa tunggal tanpa sebarang fasa sekunder yang dikesan. Purata saiz zarah bagi zarah nano meningkat secara beransur-ansur daripada 23 hingga 163 nm untuk sampel yang dikalsin pada suhu 500 hingga 1000°C. Pengukuran sifat magnet pada suhu bilik menggunakan magnetometer sampel bergetar (VSM) menunjukkan bahawa zarah nano LSMO mempunyai kelakuan feromagnet lembut dengan koersiviti berjulat antara 3.43 hingga 33.78 G. Ketepuan magnet (Ms) zarah nano meningkat dengan kenaikan saiz zarah. Daripada pengukuran resonans spin elektron (ESR), nilai g bagi zarah nano LSMO meningkat dengan peningkatan suhu kelembapan pengkalsinan. ESR juga menunjukkan kewujudan bersama fasa feromagnet dan paramagnet dalam zarah nano LSMO di bawah suhu Curie (T_c). T_c berada dalam lingkungan antara 50-80°C untuk LSMO yang dikalsin pada suhu 500°C dan ia berada dalam lingkungan antara 80-110°C untuk LSMO yang dikalsinkan pada suhu 600, 700, 800, 900 dan 1000°C.

Kata kunci: Analisis Rietveld; nanostruktur; rawatan terma; resonans elektron; sifat magnetik

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*Corresponding author; email: ahalim@upm.edu.my