Judul: Synthesis and Characterizations of Barium Titanate (BaTiO3) Thin Film with Varied Concentration of Iron (II) Acetate (Fe(CH3COO)2) as Dopant
Abstrak: Sintesis film tipis BaTiO3 dengan variasi konsentrasi pendadah Fe (0%; 2%; 4%; dan 6%) menggunakan metode chemical solution deposition (CSD) berhasil dilakukan. Larutan sampel dideposisikan di atas substrat silikon (100) tipe-p dengan teknik spin coating pada kecepatan anguler 8000 rpm selama 60 detik. Proses annealing dimulai pada suhu kamar hingga mencapai suhu 850°C dan ditahan selama 8 jam dengan kelajuan suhu sebesar 1,67°C/menit, dilanjutkan dengan pendinginan hingga suhu kamar selama 12 jam. Ketebalan film dihitung dengan metode volumetrik dan hasilnya berturut-turut yaitu 3,9867 μm; 3,8759 μm; 3,6913 μm; dan 3,0454 μm. Analisis dengan persamaan Cramer-Cohen menghasilkan parameter kisi a = b yaitu 3,843 Å; 3,882 Å; 3,898 Å; dan 3,909 Å serta parameter kisi c yaitu 4,002 Å; 3,938 Å; 4,070 Å; dan 4,024 Å dengan struktur kristal tetragonal. Nilai enegi band gap hasil analisis dengan fungsi Kubelka Munk untuk indirect transition berada dalam rentang 3,0689 – 3,2051 eV dan direct transition berada dalam rentang 2,7660 – 3,0417 eV., The synthesis of BaTiO3 thin film with variations in concentration of Fe as dopant (0%; 2%; 4%; and 6%) using chemical solution deposition (CSD) method has been successfully done. The solutions was deposited on p-type silicon (100) substrates with spin coating technique at the angular speed of 8000 rpm for 60 seconds. The annealing process was started at room temperature until 850°C and was held for 8 hours with a temperature speed of 1.67°C/minutes, followed by cooling process to room temperature for 12 hours. Film thickness was calculated using volumetric method and the results are 3.9867 μm; 3.8759 μm; 3.6913 μm; and 3.0454 μm. The results of the analysis using Cramer-Cohen equation obtained that the lattice parameters a = b are 3.843 Å; 3.882 Å; 3.898 Å; and 3.909 Å and c are 4.002 Å; 3.938 Å; 4.070 Å; and 4.024 Å with tetragonal crystal structure. The values of band gap energy that was analyzed using Kubelka-Munk method equation are in range of 3.0689 – 3.2051 eV for indirect transition and 2.7660 – 3.0417 eV for direct transition.
Keyword: thin film, barium titanate, cramer-cohen, kubelka-munk, dopant

Judul: Optical Properties and Crystal Structure  of Ferrum-doped Barium Titanate (BaTiO3) thin film.
Abstrak: Film tipis Barium Titanat didadah Ferrum telah berhasil disintesis menggunakan metode chemical solution depositioni (CSD) dan teknik spin coating. Film dibuat dengan mendeposisikan laruta kimia 2M pada substrat Si (100) tipe-p, lalu diputar menggunakan piringan spin coater pada kecepatan 3000 rpm dalam waktu 60 detik dan proses pendeposisian ini dilakukan sebanyak 5 kali. Sifat optik berdasarkan karakterisasi UV-Vis menunjukkan bahwa semakin tinggi konsentrasi Ferrum di dalam film Barium Titanat (0%; 0,5%; 1%) nilai reflektansinya akan semakin meningkat dan nilai band gap yang diperoleh menurun dari 2,8 eV – 2,4 eV. Jarak antara fonon optik longitudinal dan optik transversal mengecil seiring bertambahnya konsentrasi Ferrum. Hasil karakterisasi XRD menunjukkan parameter kisi yang menurun seiring dengan meningkatnya konsentrasi Ferrum di dalam film Barium Titanat, karena jari-jarik ionik atom Ferrum (0,77 Å) lebih kecil dibandingkan jari-jari Barium (1,36 Å)., Fe-doped Barium Titanate thin film in has been successfully synthesized using chemical solution deposition (CSD) method and spin coating technique. The film was made by depositing a 2M chemical solution on a p-type Si(100) substrate, then spin it using a spin coater plate at 3000 rpm for 60 seconds and this deposition process was carried out 5 times. The optical properties based on UV-Vis characterization show that the higher the concentration of Ferrum in the Barium Titanate film (0%; 0,5%; 1%) the reflectance value will increase and the band gap value decrease from 2,8 eV – 2,4 eV. The distance between the longitudinal and transverse optical phonons decrease on increasing the concentration of Ferrum. The XRD characterization results show that the lattice parameters decrease on increasing Ferrum concentration in the Barium Titanate film, because the ionic radius of the Ferrum atom (0,77 Å) is smaller than that of Barium atom (1,36 Å).
Keyword: barium titanat, energi bandgap, mode fonon, parameter kisi, bandgap energy, barium titanate, lattice parameters, phonon mode

Judul: Infeksi Neospora caninum: Kajian Morfopatologi
Abstrak: Neospora caninum is an intracellular obligate parasite newly recognized in late 1980’s. Neosporosis caused neuromuscular dysfunction (progressive lameness, hindlimb paresis and paralysis) in dog and abortion in cow. The dog is a definitive host of Neospora caninum. Cow, sheep, goat, horse, deer, water buffalo, rhinocheros, and fox could be an intermediate host. Gross examination was found in heart, liver, central nervous system, dan skeletal muscle. Histopatological examination demonstrated multifocal necrosis of brain, interstisial non-suppurative myocarditis, and multifocal inflammation in liver. This study reviews information on pathomorphological, pathogenesis, prevention, and treatment of neosporosis
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