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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Fibusi (Jurnal Online Fisika) Jurnal Keramik dan Gelas Indonesia MESIN Jurnal Keramik dan Gelas Indonesia eProceedings of Engineering al Kimiya : Jurnal Ilmu Kimia dan Terapan
Dani Gustaman Syarif
Badan Tenaga Nuklir Nasional
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Pembuatan Keramik Dielektrik Dari Sistem (ZnO-TiO2) Pada Suhu Sinter 1450°C dan Karakterisitiknya Firmansyah, Lutfi; Suhandi, Andi; Syarif, Dani Gustaman
MESIN Vol 9, No 2 (2007): MEMINIMALKAN KERUGIAN KAMPUS AKIBAT BANJIR
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Formation Dielectric Ceramic from (ZnO-TiOJ System at 1450C SinteringTemperature and Their Characteristics, Synthesis of dielectric ceramics from (ZnO-TiOJ system at145&C and their characterization had been carried out. This investigation was done in order to knowthepossibility of the application of the ceramics for dielectric ceramics. The ceramics were produced bymixing powder ofZnO and Ti02 with the concentration in such away so that the concentration ofTiO?larger than thestoichiometric concentration ofZn2Ti04 andbysintering at I450"C. Characterization wascarriedout through XRD, microstructural and electrical analyses. The XRDand microstructure analysesshowed that the (ZnO-TiOJ system ceramics formed Zn2.xTi.x04 solid solution which accompanied bytheformation ofZn vacancy defect. No second phasefound in the ceramics. Lattice constant ofthe Zn2.xTii x04solid solution decreasedfollowing the increase ofthe concentration ofTi02 excess (expressed byx). The Ti02 excess affected the grain size of the Zn2.xTi, x04 ceramics although the effect was notsignificant. At high temperature, the excess of Ti02 increased the dielectric constant and dissipationfactor. The ceramicsproduced in this work had relatively low dielectric constant and loss tangent andgood stability in relation to temperature change, so they can be applied as ceramic substrate andcapasitor dielectric.
KARAKTERISASIKERAMIK TERMISTOR Fe203:lmTi HASIL SINTER DAN PERLAKUAN PANAS Syarif, Dani Gustaman
MESIN Vol 9, No 1 (2007): Bahan Bakar Alternatif
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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This studywas done to know the effect ofTi02 addition on the characteristics qfFe203ceramics and the effect of a heat treatment at low temperature on the electrical characteristics ofFe203:lmTi ceramics including the mechanism ofits change as well. The Fe203:lmTi ceramics wereproduced bysintering some green pellets from mixture of 99.9 mole %Fe203 and I mole %Ti02 at1200°C for I hour in air. A heat treatment was carried out at 75(fC in air with a cooling rate ofTC/minute. Electrical resistivity ofthe ceramics was measured at different temperatures before andafter heat treatment. X-ray diffraction (XRD) analysis was done to know the crystal structure of theceramics and phases formed therein. It was known that the crystal structure of the Fe203 andFe203:lmTi ceramics was thesame i.e. that similar to hematite. The electricalcharacteristics showedthat the room temperature resistivity (psn) of the Fe203 ceramics drastically decreased with I mole %Ti02 addition and showedthat the (pSR) oftheFe203:lmTi ceramics increased significantly while thevalue of the thermistor constant (B) relatively did not change, after the heat treatment. The increase of(psn) after the heat treatment was caused by lessformation of oxygen vacancies which behave as theelectron sourcefor conduction band.
STUDI APLIKASI KERAMIK ZnBiCo SEBAGAI TERMISTOR NTC Syarif, Dani Gustaman; Henny, Henny; Suhandi, Andi
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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STUDY ON THE APPLICA TION OF ZnBiCo CERAMICS AS NTC THERMISTORS. A study onthe application ofZnO-Bi203-CoO (ZnBiCo) ceramicsfor NTC thermistors had been carried out. The aim ofthisstudywas tofind alternative NTCthermistors. The studywas done as follow. Powder ofZnO, CoO andBi203 with concentration of Bi203 of 0, 0.25, 0.5, and 0.75 mole % and of CoO of 2 mole % werehomogeneously mixed. The mixedpowder was pressed with pressure of3.9ton/cm2 into pellets and sinteredat HOCfC in airfor 1 hour. The sintered pellets were evaluated using x-ray diffraction (XRD), opticalmicroscope andSEM(Scanningelectron microscope). Resistivity-temperature characteristic (p-Tcurve) wasdetermined through measurement of resistivity at various temperatures from room temperature to WCfC.XRD andmicrostructure datashowed thatmostofCoOformed a solid solution withZnOmatrix while Bi203was segregated at grain boundaries as ZnO,24Bi203 second phase. It was known that the all ceramicsproducedin this studyhad the same structure i.e. hexagonal. It was known also that the addition ofBi203increased the average grain size of the ZnBiCo ceramics. Electrical data showed that Bi203 increased theroom temperature resistivity (ps^) and the thermistor constant (B) of the ZnBiCo ceramic thermistors. Thethermistor constant and sensitivity (a) of the thermistor ceramics in this study were relatively high (largerthan 200(fKfor Band larger than 2.2 (°K)~lfor a)andsuitableforcommercial application.
Co-Authors - Wiendartun A. Suhandi A.A. Ketut Agung Cahyawan W Abrar Abrar Ahmad Aminudin Anceu Murniati Aria Respati, Aria Arie Hardian Atiek Rostika Noviyanti Dwi Harjono E. Suhendi Halim, Riyan Haryadi, Hendi Jaenudin Kamal, Jaenudin Jasmansyah, Jasmansyah Jenatu, Yolanda Maryani Jovi Kusuma Dilaga, Jovi Kusuma Karya, Teguh Lutfi Firmansyah, Lutfi Muhammad Reza Nafisah, Aulia Zakiyatun Nanda Dwimar Hakim Nur Tursina Nurhayati, Mita Puspita Sari Sanusi Sanusi Soni Setiadji Tety Sudiarti