Sintesis dan Karakterisasi Nanopartikel Magnetik CoZnFe204 dengan Metode Kopresipitasi

Heri Kiswanto; Edi Suharyadi; Takeshi Kato; Satoshi Twata

doi:10.17509/wafi.v5i1.24084

Authors

Heri Kiswanto Program Studi Fisika, lnsitut Teknologi dan Sains Nahdlatul Ulama Pekalongan, lndonesia
Edi Suharyadi Departemen Fisika, Universitas Gad}ah Mada, lndonesia
Takeshi Kato Department of Electronics, Nagoya University, Japan
Satoshi Twata lnsitute of Materials and Systems Sustainability, Nagoya University, Japan

DOI:

https://doi.org/10.17509/wafi.v5i1.24084

Keywords:

Nanopartikel CoZnFe204, suhu annealing, struktur kristal, sifat kemagnetan

Abstract

Nanopartikel CoZnFe₂O₄ telah berhasil disintesis dengan metode kopresipitasi dan diannealing pada suhu yang berbeda, yaitu 400°C, 600°C, 800°C, dan 1000°C selama 2 jam. Ukuran kristalit diestimasi dengan formula Scherrer's dan ditemukan meningkat dari 13,4 hingga 39,2 nm akibat pertumbuhan butir. Parameter kisi ditemukan meningkat dari 8,18 hingga 8,25 A akibat subtitusi Zn akibat subtitusi Zn yang memiliki radius ionic lebih besar. Spektra FTIR mengkonfirmasi adanya vibrasi stretching pada bilangan gelombang sekitar 478 dan 586 cm^-1 pada kisi tetrahedral dan kisi oktahedral. Baik koersivitas (Hc) maupun magnetisasi saturasi (Ms) meningkat dari 51-191 emu/g dan 150 – 250 0e dengan meningkatnya suhu annealing karena adanya pertumbuhan butir serta perubahan mikrostruktur. Citra TEM menunjukan bahwa morfologi dan mikrostruktur berubah secara signifikan selama annealing. Pada suhu 1000°C memberikan hasil optimum pada nilai Ms dan Hc nanopartikel CoZnFe₂O₄.

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