SINTESIS BAHAN MAGNETIK ZnxFe(3-x)O4 DENGAN METODE KO-PRESIPITASI SEBAGAI PENYERAP GELOMBANG MIKRO
DOI:
https://doi.org/10.29122/mipi.v13i2.3241Abstract
Bahan magnetik ZnxFe(3-x)O4 (x = 0,75; 1 dan 1,25) disintesis dengan mencampurkan serbuk ZnCl2 dan FeCl2 sesuai dengan perbandingan molnya dengan metode ko-presipitasi, kemudian dikalsinasi pada suhu 1000 ºC selama 5 jam. Hasil identifikasi fasa dengan XRD (X-ray diffractometer) menunjukkan bahwa sampel dengan nilai x=0,75 membentuk fasa ZnFe2O4 dan Fe2O3, untuk nilai x=1 membentuk fasa tunggal dari ZnFe2O4, sedangkan untuk nilai x=1,25 membentuk fasa ZnFe2O4 dan ZnO. Pengukuran sifat magnet VSM (vibrating sample magnetometer) menunjukkan bahwa sampel berperilaku ferromagnetik dengan nilai Ms semakin tinggi (pada rentang 21,2 – 31,7 emu/g) sedangkan nilai Hc semakin kecil (pada rentang 254 – 135 Oe) seiring dengan penambahan kandungan ion Zn2+. Kemampuan penyerapan gelombang mikro yang diukur dengan VNA (Vector Network Analyzer) menunjukkan nilai RL (Reflection Loss) maksimum pada komposisi sampel x = 1,0 (ZnFe2O4) adalah -12,77 dB pada frekuensi 10,18 GHz. Berarti bahwa serbuk ZnFe2O4 mampu menyerap gelombang mikro sebesar 94,69 % pada frekuensi 10,18 GHz. Dengan demikian, ZnFe2O4 dapat diaplikasikan sebagai bahan penyerap gelombang mikro.
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