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Didin Sahidin Winatapura
Pusat Sains dan Teknologi Bahan Maju-BATAN
Materials Science & Nanotechnology

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STRUKTUR DAN SIFAT KEMAGNETAN NANOPARTIKEL HEKSAFERIT BaFe(12-2X)(MnNi)XO19 HASIL KOPRESIPITASI Didin Sahidin Winatapura; Deswita Deswita; Nanang Sudrajat
Jurnal Sains Materi Indonesia Vol 18, No 3: APRIL 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.18.3.4116

Abstract

Nanopartikel heksaferit BaFe(12-2x)(MnNi)xO19 (x = 0,0; 0,3; 0,7; 1,0) telah berhasil disintesis. Tujuan dari penelitian ini adalah untuk membuat heksaferit BaFe (12-2x)(MnNi)xO19 dan mengamati pengaruh konsentrasi doping ion Mn dan Ni di dalam bahan heksaferit terhadap perilaku struktur dan sifat magnet. Heksaferit BaFe (12-2x)(MnNi)xO19dibuat dari bahan dasar Fe(NO3)3, Ba(NO3), Mn(NO3) dan Ni(NO3) dengan metoda kopresipitasi, yang kemudian diikuti perlakuan panas pada suhu 925 oC selama 3 jam. Produk BaFe (12-2x)(MnNi)xO19 yang dihasilkan kemudian dikarakterisasi menggunakan peralatan difraktometer sinar-X (XRD), Scanning Electron Microscope (SEM), Vibrating Sample Magnetometer (VSM) dan Fourier Transform-Infra Red (FT-IR). Data XRD yang dihasilkan dianalisis menggunakan program General Structure Analysis System (GSAS). Hasil refinement XRD menunjukkan bahwa substitusi ion-ion Ni dan Mn kedalam Ba heksaferit dapat mengubah perilaku parameter struktur, seperti parameter kisi, volume unit sel dan kerapatan atom. Bentuk dan distribusi ukuran partikel Ba heksaferit mengalami perubahan dengan penambahan doping ion Mn dan Ni. Demikian pula , perilaku sifat kemagnetan seperti koersivitas intrinsik (Hci), magnet saturasi (Ms) dan magnet remanen (Mr) dari Ba heksaferit hasil substitusi berubah dengan penambahan substitusi ion-ion Ni dan Mn.
THE EFFECT OF CALCINATION ON MICROWAVE ABSORBING PROPERTIES OF Fe3O4/TiO2 COMPOSITE Adel Fisli; Didin Sahidin WinataPura; Wisnu Ari Adi; Yana Taryana
Jurnal Sains Materi Indonesia Vol 20, No 2: JANUARY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.541 KB) | DOI: 10.17146/jsmi.2019.20.2.5292

Abstract

THE EFFECT OF CALCINATION  ON MICROWAVE ABSORBING PROPERTIES OF Fe3O4/TiO2 COMPOSITE. The Fe3O4/TiO2 composites have been fabricated by simple precipitation method for microwave absorbing. The obtained powder of Fe3O4/TiO2 which 10 % iron oxide containing were calcinated from 300oC – 700oC for 3 hours. The characteristic of samples was investigated by various techniques. The TEM image showed the composites form agglomeration with particles size of around 20 nm.  The all sample contents most of the anatase phase. The increasing of calcination temperature is the bigger of crystallite size. The Raman bands shift towards lower wavenumber and their full-widths at half-maximum (FWHM) of the bands decreases as the particles size increase. The measurement of the magnetic properties illustrated that the Fe3O4/TiO2 exhibited paramagnetic behavior at room temperature. The microwave absorbing properties of the sample was measured by VNA  using frequency microwave filter in  X-band range  (8-12 GHz). The reflection loss (RL) values were calculated for thickness 1 mm of the sample. The minimum reflectivity peak value tends to decrease with the increase of the calcination temperature due to increasing the crystallite size of the particles. The lowest reflectivity value of Fe3O4/TiO2 was occurred calcinated at 600oC with -13.4 dB loss at 10.9 GHz, that is more 80% absorbed of the electromagnetic wave in thickness 1 mm of the sample. The microwave absorption properties the calcinated 700oC the sample decrease due to the loss of magnetic properties of the sample. This study concluded that increase in average crystalline size, microwave absorption properties increased. However, the decrease dratisly of magnetic properties of the sample causes microwave absorption properties to decrease.
Co-Authors Adel Fisli Deswita Deswita Nanang Sudrajat Wisnu Ari Adi Yana Taryana