Garuda - Garba Rujukan Digital

Karakterisasi Keramik (Mg0,8Zn0,2)TiO3+4wt% Bi2O3 sebagai Material Dielectric Resonator Oscillator, Struktur, Mikrostruktur dan Densitasnya Elga Nilawati; Frida Ulfah Ermawati
Jurnal Fisika Unand Vol 10, No 2 (2021)
Publisher : Universitas Andalas

Penelitian ini bertujuan untuk mengkaji potensi aplikasi keramik (Mg0,8Zn0,2)TiO3+4wt% Bi2O3 (disingkat MZT02+4wt%Bi2O3) sebagai resonator pada rangkaian dielectric resonator oscillator (DRO) yang bekerja pada daerah frekuensi gelombang mikro, serta menguji struktur, mikrostruktur dan densitas bulk keramik. Fabrikasi keramik dilakukan dengan ball-milling antara serbuk kristalin MZT02 dengan 4wt% serbuk Bi2O3 pada kecepatan 500 rpm selama 5 jam. Serbuk hasil milling dikompaksi dengan hydraulic-hand press dan cylindrical die press untuk menghasilkan pelet. Semua pelet disinter pada suhu 1100°C selama 4, 6 dan 8 jam untuk menjadi keramik. Struktur keramik dengan waktu penahanan 4 dan 6 jam mengandung fasa MgTiO3=(97,87±8,24) %molar, sisanya fasa TiO2 rutil. Keramik dengan penahanan 8 jam mengandung fasa MgTiO3=(98,44±2,07) %molar, MgTi2O5=(1,49±0,30) %molar dan sisanya TiO2 rutil. Bertambahnya waktu tahan sinter relatif tidak menyebabkan perubahan ukuran parameter kisi, volume sel satuan sedikit berkurang dan densitas bulk juga berkurang dari 2,792, 2,776 menjadi 2,745 g/cm3. Mikrostruktur ketiga keramik berupa gumpalan butir dengan ukuran rata-rata 0,3-1,2 μm disertai pori-pori. Karakterisasi DRO merekam frekuensi resonansi pada posisi yang sama untuk ketiga keramik, yaitu 5,12 GHz memberi bukti bahwa keramik uji dapat diaplikasikan sebagai resonator DRO pada frekuensi gelombang mikro dan variasi waktu tahan sinter tidak merubah performa tersebut. This study aims to examine the potential application of (Mg0.8Zn0.2)TiO3+ 4wt% Bi2O3 (abbreviated: MZT02+4wt% Bi2O3) ceramics as a resonator in a dielectric resonator oscillator (DRO) circuit operating in microwave frequencies and to examine its structure, microstructure and bulk density. Ceramic fabrication was carried out by ball-milling between MZT02 crystalline powder and 4wt% Bi2O3 powder at 500 rpm for 5 h. The milled powder was compacted using a hydraulic-hand press and a cylindrical die press to produce pellets. All pellets were sintered at 1100°C for 4, 6 and 8 h to become ceramics. The ceramic structure with 4 and 6 h holding time contains MgTiO3 phase = (97.87 ± 8.24)% molar, the rest was TiO2 rutile phase. Ceramic with 8 h contained MgTiO3phase = (98.44 ± 2.07)% molar, MgTi2O5 = (1.49 ± 0.30) molar% and the remaining TiO2 rutile. Increasing the sinter holding time relatively did not change in the lattice parameter sizes, the unit cell volume was slightly reduced and the bulk density was also reduced from 2.792, 2.776 to 2.745 g/cm3. Microstructure of the three ceramics contain groups of grains with an average size of 0.3-1.2 μm along with pores. DRO characterization recorded the resonant frequency at the same position for the three ceramics, namely 5.12 GHz, providing evidence that the ceramics can be applied as a DRO resonator at microwave frequencies and the variation in sinter holding time did not change this performance

Perancangan Alat Ukur Tegangan Permukaan dengan Induksi Elektromagnetik Indarniati Indarniati; Frida Ulfah Ermawati
Jurnal Fisika dan Aplikasinya Vol 4, No 1 (2008)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Tegangan permukaan merupakan sifat permukaan suatu zat cair akibat pengaruh tegangan. Guna mengetahui seberapa besar nilainya dilakukan pengukuran dengan menggunakan susunan alat hasil rancangan yang menggunakan sensor induksi elektromagnetik, menggantikan Newtonmeter yang selama ini dipergunakan. Perancangan tersebut dimaksudkan untuk mengetahui apakah sensor induksi elektromagnetik dapat dipergunakan sebagai pengganti Newtonmeter dalam pengukuran tegangan permukaan zat cair, dan dapat menunjukkan proses fisika yang terjadi selama pengukuran tegangan permukaan berlangsung karena mengetahui perubahan tiap gaya tarik yang terjadi selama pengukuran, nilai gaya tarik tersebut, serta nilai tegangan permukaan zat cair dapat diketahui secara langsung. Hal ini dimungkinkan karena data ditampilkan dalam bentuk grafik. Penelitian mencakup persiapan, perencanaan, dan perakitan alat sampai dengan pengujian (studi kelayakan) hasil rancangandengan menggunakan oli SAE 20W-50, oli SAE 30, dan bensin sebagai sampel uji.

Optical Activity of an Asymmetric Substance Frida Ulfah Ermawati
Jurnal Fisika dan Aplikasinya Vol 6, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

This paper reported the investigation on the property of optical activity from three different isomers of L-, Dand DL--alanine (CH3CHNH2CO2H), a proposed radiation dosimetric material. The aim was to confirm the impact of attachment of -carbon atom of the systems to the four different groups, that is, the -carbon or methyl group, H-group, CO2H-group and NH2-group, to their response to any incoming plane-polarized light. Optical activity of a substance is a measure of the ability of a substance to rotate a plane of polarization, if solution of the substance is placed in the path of plane-polarized light. A polarimeter of Perkin-Elmer Model 141 with a Sodium lamp of 584-nm wavelength (D-line) and equipped with a digital counter was occupied in this work to measure the number of degrees of rotation of plane-polarized light at room temperature due to 8.3% concentration of each L-, D- and DL--alanine solutions. It was obtained that molecules of L-isomer rotate the counter of the polarimeter clockwise, from the observer’s point a view. While the molecules of D-isomer rotate the counter anti clockwise, at the similar amount of rotation. These results confirm the asymmetric structure belong to the -alanine system. Molecules of DL-isomer, however, do not rotate the counter at all. The existence of similar number of the D- and L-molecules in the DL-solution is the cause.

Five-Tier Diagnostic Test Instrument for Uniform Circular Motion Concepts: Development, Validity, Reliability and Limited Trials Nisrina Nur Ramadhani; Frida Ulfah Ermawati
Jurnal Pendidikan Fisika Vol 9, No 1 (2021): PENDIDIKAN FISIKA
Publisher : Universitas Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26618/jpf.v9i1.4763

Students' understanding on Physics concepts could be different from each other. Based on the conceptual diagnostic test, especially in five-tier format, the students' different understanding can be categorized into several conception levels. One of them is misconception. For example, students consider that all objects moving on a circular trajectory called uniform circular motion (UCM). According to the Physics concept, an object in UCM must meet three criteria: an object travels along a circular path, the radius of the path is always fixed, and the object moves at a constant speed. However, a standardized conceptual diagnostic test instrument in five-tier format is not yet available. This work aims to develop a five-tier diagnostic test instrument for UCM concepts, perform validity and reliability test and use the developed instrument to identify a number of students’ conception level. The research development method was employed to produce 15 valid and reliable questions. The validity test consisted of internal and external (content and construct empirical) aspects. The internal validity obtained was 88% (very valid). The content aspect, i.e. the false positive=4.95% and the false negative=5.59% both met the criteria 10%. The construct aspect obtained by a Pearson product moment correlation was (5% sig. level). The reliability level of the Alpha Cronbach coefficient shows that the developed instrument was valid and reliable. The limited trial result shows that the students’ conception levels on the UCM concepts was generally lack of knowledge.

Pelatihan Dasar Robot Line Tracer Analog bagi Siswa MAN 1 Jombang Meta Yantidewi; Dzulkiflih Dzulkiflih; Frida Ulfah Ermawati; Abu Zainuddin
Madaniya Vol. 3 No. 4 (2022)
Publisher : Pusat Studi Bahasa dan Publikasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53696/27214834.308

Teknologi robotika berkembang semakin pesat di era Revolusi Industri 4.0. Berbagai macam robot semakin mewarnai kehidupan sehari-hari. Keadaan yang demikian menjadikan pelajar tertarik mempelajarinya, sehingga MAN 1 Jombang sebagai salah satu lembaga pendidikan menjadikan robotika sebagai salah satu kegiatan ekstrakurikulernya. Sayangnya, ekstrakurikuler robotika di MAN 1 Jombang semakin sedikit pesertanya. Untuk mengantisipasi semakin menurunya anggota ekstrakurikuler ini, MAN 1 Jombang dan tim PKM Jurusan Fisika Universitas Negeri Surabaya mengadakan pelatihan dasar robot line tracer analog yang ditujukan bagi para siswa MAN 1 Jombang. Sebanyak 17 siswa MAN 1 Jombang yang terbagi dalam enam kelompok mengikuti pelatihan ini. Dari keenam kelompok tersebut telah berhasil dirakit enam buah robot line tracer analog. Para siswa peserta pelatihan sangat antusias mengikuti kegiatan ini bahkan merasa termotivasi untuk mempelajari lebih lanjut bidang robotika meskipun beberapa merasa bahwa bidang ini tidaklah mudah dipelajari.

Socialization and Practice of Processing Coconut Cooking Oil based on SNI 3741:2013 Quality Standard for Residents in Gondoruso Village, Pasirian Lumajang Frida Ulfah Ermawati; Dzulkiflih Dzulkiflih; Tony Seno Aji; Choirul Anna Nur Afifah; Abu Zainuddin
Lumbung Inovasi: Jurnal Pengabdian kepada Masyarakat Vol. 7 No. 3 (2022): September
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/linov.v7i3.766

Gondoruso village, Pasirian Lumajang has many coconut trees. However, the coconuts were only harvested and sold in the local market at a price of IDR 2,000-3,000/fruit. Some local residents had initiated efforts to process coconuts into cooking oil, but the resulting oil smelled rancid so they stopped it. This paper reported the results of our community service activities in assisting Gondoruso Village residents to proceed coconut into cooking oil that meets the SNI 3741:2013 quality standard. The aim was to train the residents’ skills in producing qualified coconut cooking oil so they could earn extra family income. Eight old coconuts were grated, and thick coconut milk was taken. The coconut milk was left overnight in the refrigerator to produce lumps of coconut milk. The lumps of coconut milk were taken and cooked over low heat. About 10 minutes later, the oil started to come out, and the cooking process continued for 40-45 minutes until all the oil-came out, and 550 ml of cooking oil was produced. The SNI 3741:2013 quality test revealed that the cooking oil was of very good quality because the values of 6-SNI parameters met the standard, i.e., organoleptic is liquid, clear yellow, sweet coconut, and tasteless; moisture content=0.13% w/w; acid number=0.06% w/w; peroxides number=0; the pelican oil=negative, and the linoleic acid=0.13%. The production and market analyses stated that the production cost of 550 ml of coconut oil=IDR 27,600, while the selling price in the market=IDR 80,000/500 ml.

Pengaruh Waktu Tahan Kalsinasi terhadap Komposisi Fasa dan Ukuran Kristalit Serbuk Mg(Ti0,99Sn0,01)O3 Hasil Sintesis dengan Metode Pencampuran Larutan Syadza Aisyah Hermadianti; Frida Ulfah Ermawati
Jurnal Inovasi Fisika Indonesia (IFI) Vol 12 No 2 (2023): Vol 12 No 2
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v12n2.p1-9

Abstrak Pada penelitian ini, serbuk Mg(Ti0,99Sn0,01)O3 (disingkat MTS001) disintesis menggunakan metode pencampuran larutan yang dikalsinasi pada suhu 800 °C. Sintesis serbuk MTS001 dilakukan dengan bahan awal berupa serbuk logam Mg, Ti, dan Sn (Merck) dan HCl 12 M (37 %). Serbuk MTS001 hasil sintesis kemudian dikalsinasi selama 2, 4, dan 6 jam untuk menganalisis pengaruh waktu tahan kalsinasi terhadap %molar, %berat, densitas atom, parameter kisi, volume sel satuan, dan ukuran kristalit. Data struktural menunjukkan bahwa fasa utama adalah MgTiO3 (86,61-92,10 %berat) dan fasa impurity TiO2, diikuti dengan ekstra fasa MgO khususnya pada waktu tahan 4 jam. Data volume sel satuan dan parameter kisi mengalami kenaikan dari waktu tahan 2 jam menuju 4 jam, kemudian menurun pada 6 jam. Kenaikan kedua data tersebut dipengaruhi oleh terbentuknya fasa impurities yang lebih banyak dibandingkan waktu tahan yang lain, yaitu fasa TiO2 dan MgO, sehingga mempengaruhi transformasi pembentukan fasa MgTiO3. Perubahan data tersebut membuktikan bahwa telah terbentuk larutan padat substitusi MTS001. Seiring dengan naiknya waktu tahan kalsinasi 2-6 jam, nilai densitas atom dan ukuran kristalit mengalami kenaikan, sehingga menyebabkan terjadinya pelebaran puncak. Kata Kunci: serbuk Mg(Ti0,99Sn0,01)O3, komposisi fasa, ukuran kristalit, densitas atom, waktu tahan kalsinasi Abstract In this study, Mg(Ti0.99Sn0.01)O3 powders (abbreviated as MTS001) were synthesized using a liquid mixing method calcined at 800 °C. The synthesis of MTS001 powders were carried out with raw materials in the form of Mg, Ti, and Sn metal powders (Merck) and 12 M HCl (37 %). The synthesized MTS001 powders were then calcined for 2, 4, and 6 hours to analyze the effect of calcination holding time on %molar, %weight, atomic density, lattice parameters, unit cell volume, and crystallite size. The structural data showed that the main phase was MgTiO3 (86.61-92.10 wt%) and TiO2 impurity phase, followed by extra MgO phase especially at 4 h holding time. Unit cell volume data and lattice parameters increased from 2 hours to 4 hours, then decreased at 6 hours. The increase of both data is influenced by the formation of of more impurities compared to other holding times, namely the TiO2 and MgO phases, thus affecting the transformation of the formation of the MgTiO3. The change in data proves that the MTS001 substitution solid solution has been formed. Along with the increase in calcination holding time 2-6 hours, the value of atomic density and crystallite size has increased, thus causing peak broadening. Keywords: Mg(Ti0.99Sn0.01)O3 powders, phase composition, crystallite size, atomic density, holding time calcination

The MICROSTRAIN PADA SERBUK Mg(Ti0,95Sn0,05)O3 HASIL SINTESIS DENGAN METODE PENCAMPURAN LARUTAN AKIBAT VARIASI WAKTU TAHAN KALSINASI Muhammad Fikri Zulfy Fardhany; Frida Ulfah Ermawati
Inovasi Fisika Indonesia Vol 12 No 3 (2023): IN PRESS Vol 12 No 3
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v12n3.p10-19

Serbuk magnesium titanat dengan struktur ilmenit merupakan salah satu material favorit yang diaplikasikan dalam sistem telekomunikasi gelombang mikro sebagai antena, fillter, dan resonator. Pada penelitian ini, serbuk Mg(Ti0,95Sn0,05)O3 (disingkat MTS005) disintesis dengan metode pencampuran antara larutan MgCl2, TiCl4, dan SnCl4. Serbuk amorf dikalsinasi pada suhu 800 ᵒC selama 4, 6 dan 8 jam sehingga didapatkan serbuk kristalin. Uji X-Ray Diffraction (XRD) digunakan untuk menganalisis data fasa kristalin dan Full Widht at Half Maximum (FWHM). Didapatkan struktur kristal MTS005 pada ketiga waktu tahan kalsinasi tersebut terdiri dari MgTiO3 sebagai fasa utama (87,00 – 93,98) %molar dan sisanya berupa fasa impurity TiO2. Penggunaan doping ion Sn4+ pada ion Ti4+ diduga menyebabkan terjadinya microstrain pada MTS005. Microstrain tersebut menyebabkan pelebaran puncak yang ditandai dengan perbedaan nilai FWHM pada orientasi (hkl) yang sama tiap waktu tahan kalsinasi. Microstrain mengalami tren menurun yang berbanding lurus dengan tren FWHM. Selain Microstrain, defect juga dikonfirmasi berkontribusi terhadap terjadinya pelebaran puncak. Kata Kunci: MTS005, FWHM, pelebaran puncak, microstrain, defect Abstract Magnesium titanate powder with an ilmenite structure is one of the favorite materials used in microwave telecommunication systems as antennas, fillers and resonators. In this study, Mg(Ti0.95Sn0.05)O3 powder (abbreviated as MTS005) was synthesized by mixing MgCl2, TiCl4 and SnCl4 liquid solutions. The amorphous powder was calcined at 800 ᵒC for 4, 6 and 8 hours to obtain a crystalline powder. The X-Ray Diffraction (XRD) examination was used to analyze the crystalline phase and Full Widht at Half Maximum (FWHM) data. The crystal structure of MTS005 at the three calcination holding times was obtained, consisting of MgTiO3 as the main phase of (87.00 – 93.98) % molar, and the remaining molar fraction belongs to impurity TiO2 phase. The use of Sn4+ ion doping on Ti4+ ion suspected of causing microstrain on MTS005. The microstrain causes a broadening of the peak which was characterized by a difference in the FWHM value at the same (hkl) orientation on each holding time. Microstrain experienced a downward trend which was directly proportional to the FWHM trend. Besides microstrain, defects was also confirmed to contribute to the peak broadening. Keywords: MgTiO3, FWHM, peak broadening, microstrain, defect

ANALISIS RIETVELD POLA XRD SERBUK Mg(Ti0,98Sn0,02)O3 HASIL SINTESIS DENGAN METODE PENCAMPURAN LARUTAN Muhammad Dhafi Zainal Abror; Frida Ulfah Ermawati
Inovasi Fisika Indonesia Vol 12 No 3 (2023): IN PRESS Vol 12 No 3
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v12n3.p26-34

Serbuk Mg(Ti0,98Sn0,02)O3 (disingkat MTS002) disintesis menggunakan metode pencampuran larutan dengan doping ion Sn4+ terhadap ion Ti4+ pada suhu kalsinasi 800 °C serta variasi waktu tahan 4, 6, dan 8 jam. Bahan awal yang digunakan berupa serbuk logam Mg, Sn, dan Ti dengan kemurnian tinggi (>98%) yang masing-masing ditimbang sesuai dengan stoikiometrinya, serta HCl 12 M. Tujuan dari penelitian ini adalah menganalisis data komposisi fasa serbuk MTS002 secara kuantitatif menggunakan metode Rietveld berupa parameter kisi, volume sel satuan, %berat, %molar, dan densitas atom dari pola XRD hasil kalsinasi pada suhu 800 °C yang ditahan selama 4, 6, dan 8 jam tersebut. Hasil menunjukkan bahwa terbentuk fasa dominan MgTiO3 (PDF No. 06-0494) sebesar (83,57-89,37) %berat, dan sisanya adalah fasa impurity TiO2 (PDF No. 21-1276) dan MgO (PDF No. 43-0945) khusus pada waktu tahan 8 jam. Nilai parameter kisi dan volume sel satuan mengalami perubahan seiring dengan naiknya waktu tahan kalsinasi. Perubahan tersebut disebabkan oleh terbentuknya larutan padat MTS002 sebagai akibat dari doping ion Sn4+ tersebut. Naiknya waktu tahan kalsinasi juga berpengaruh terhadap nilai densitas atom di mana berhubungan dengan kerapatan dan keteraturan atom. Kata Kunci: MgTiO3, waktu tahan, kalsinasi, Match, Rietveld Abstract Mg(Ti0.98Sn0.02)O3 powder (abbreviated as MTS002) was synthesized using the solution mixing method by doping Sn4+ ions to Ti4+ ions at a calcination temperature of 800 °C and variations in holding time of 4, 6, and 8 hours. The starting materials used are high purity (>98%) Mg, Sn, and Ti metal powders, each of which is weighed according to its stoichiometry and 12 M HCl. The purpose of this research is to analyze the phase composition data of MTS002 powder quantitatively using the Rietveld method in the form of lattice parameters, unit cell volume, %weight, %molar, and atomic density from the XRD pattern of calcination results at 800 °C held for 4, 6, and 8 hours. The results show that the dominant phase MgTiO3 (PDF No. 06-0494) is formed at (83.57-89.37) % weight, and the rest are impurity TiO2 (PDF No. 21-1276) and MgO (PDF No. 43-0945) phases specifically at a holding time of 8 hours. The value of lattice parameters and unit cell volume changes as the calcination holding time increases. These changes are caused by the formation of MTS002 solid solution as a result of the doping of Sn4+ ions. The increase in calcination holding time also affects the value of atomic density which is related to the density and orderliness of atoms. Keywords: MgTiO3, holding time, calcination, Match, Rietveld

Title

Found 9 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 9 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 9 Documents
Search