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Journal : Jurnal Teori dan Aplikasi Fisika

Pengaruh Suhu Sintering Terhadap Tingkat Kemurnian Fase Superkonduktor BPSCCO-2223 pada Kadar Ca 2,10 Menggunakan Metode Pencampuran Basah Surahman, Rizki Putri; Suprihatin, Suprihatin; Riyanto, Agus
Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (850.076 KB) | DOI: 10.23960/jtaf.v7i1.1926

Abstract

Sintering temperature has an effecton the purity level BPSCCO-2223 superconductor phase. This study has been conducted using the wet-mixing method with the materials used are Bi2O3, PbO, SrCO3, CaCO3, CuO, NHO3 and aquades. Synthesis carried out by slowly dissolving HNO3 and aquades then gradually for 40 hours dried out at a temperature of 300, 400, 600 °C. The sample was analysed with calcination for 10 hours at 800 °C and sintering for 20 hours using variations of temperature on each 850, 855, 860, and 865 °C. The XRD results show that phase purity which increases with increasing sintering temperature. The relative high volume fraction of the BPSCCO-2223-865 sample is 87,20% while, the lowest volume fraction of BPSCCO-2223-850 is 58,25%. The relative high orientation degree of BPSCCO-2223-855 is 27,64% and the lowest orientation degree of BPSCCO-2223-860 is 21,16%. The SEM result shows that all samples have layers arranged (oriented) by empty spaces between relatively small plaque (void).
Variasi Doping Pb terhadap Pertumbuhan Fase Bahan Superkonduktor Bi-2212 pada Kadar Ca 1,10 dan Suhu Sintering 830°C suprihatin, suprihatin; Pratiwi, Riandini; Syafriadi, Syafriadi
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (395.662 KB) | DOI: 10.23960/jtaf.v5i2.1494

Abstract

Abstract. Research on the effect of Pb doping is 0; 0.1; 0.2; 0.3 and 0.4 to the phase growth of the Bi-2212 Ca 1,10 superconducting material was carried out by the solid method at a calcination temperature of 800°C for 10 hours and sintering temperature of 830°C for 20 hours. The effect of Pb doping on the phase growth of superconducting material can be seen by volume fraction, impurity, and degree of orientation. The results showed that samples without doping Pb (Pb 0) had lower volume fraction values than samples with doping Pb (Pb 0.1-0.4). Addition of Pb doping (Pb 0.1-0.4) will increase the volume fraction. The highest volume fraction (Fv) in doping Pb 0.4 was 80.99%, whereas the lowest volume fraction on doping Pb 0.1 was 67.73%. Samples without doping Pb (Pb 0) had a lower orientation grade value than samples with doping Pb (Pb 0.1-0.4). The addition of Pb doping 0.1 and 0.4 has a higher orientation degree compared to Pb doping of 0.2 and 0.3. The sample with doping Pb 0,1 has the highest orientation degree value that is 24,87%. Based on the SEM results all the seals have shown layers arranged in a direction (oriented) with empty space between the slab (void) is relatively small.
Pertumbuhan Fase Bahan Superkonduktor Bi-2223 dengan Variasi Doping Pb (BPSCCO-2223) pada Kadar Ca=2,10 dan Suhu Sintering 855oC suprihatin, suprihatin
Jurnal Teori dan Aplikasi Fisika Vol 4, No 2 (2016): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v4i2.1496

Abstract

Abstract. The synthesis of BSCCO-2223 superconducting material with varians of doping Pb (BPSCCO-2223) at level of Ca = 2,10 and sintering temperature of 855oC has been done by solid state reaction method. The varians of doping Pb was used for the research are 0,00; 0,01; 0,20; 0,30; and 0,40. Variation was carried out to determine the effect of doping Pb on phase formation superconducting material of BPSCCO-2223 that views based on volume fraction, the degree of orientation and impurities. Calcination was executed for 10 hours at temperature of 800oC and sintering for 20 hours at temperature of 855oC. Result of research shows the increase of doping Pb in the sample could increase volume fraction of BPSCCO-2223 and decrease impurity. Volume fraction value of BPSCCO-2223 that is relatively high is 62,06% on doping Pb 0,40. The lowest volume fraction is 42,14% on doping Pb 0,00. The degree of orientation in the sample without doping Pb is 38.51%, the value of degrees of orientation decreases in the sample with doping Pb 0.10 to 21.81%. Then the degree of orientation will increase along with the increase of doping Pb (0.01-0.04). The degree of orientation in sample of doping Pb 0.40 is 38.13%. Besides the addition of doping Pb will decrease the value of impurities. The lowest impurity value of is 37,94% on doping Pb 0,40. Result of SEM shows that all samples have shown that layers arranged in the direction of the empty space between the plates (void) is relatively small.
Pengaruh waktu sintering Terhadap tingkat kemurnian fase Superkonduktor BPSCCO-2223 dengan Kadar Ca 2,10 Menggunakan Metode Pencampuran Basah Rahayu, Isnaini; Suprihatin, Suprihatin; Riyanto, Agus
Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (688.6 KB) | DOI: 10.23960/jtaf.v7i1.1931

Abstract

Research about the effect of sintering time on the phase purity level of superconductor BPSCCO-2223 at the level of Ca 2,10 has been synthesized using the wet-mixing method. Synthesis carried out by slowly dissolving HNO3 and aquades then gradually for 40 hours dried out at a temperature of 300, 400, 600 °C. The sample was calcined for 10 hours at 800 °C and sintered using variations of time 10, 20, 30, and 40 hours at 865°C. Variations were carried out to determine the effect of sintering time on the purification of the superconductor. XRD result shows a decrease in phase purity with increasing the sintering time. Volume fraction that is relatively high at BPSCCO-2223/ts10 is 88,88%. While the lowest volume fraction of BPSCCO-2223/ts40 is 71,51%. The relative high orientation degree of BPSCCO-2223/ts30 is 33,76% and the lowest orientation degree of BPSCCO-2223/ts20 is 22,21%. The SEM result shows that all samples have layers arranged (oriented) by empty spaces between the plate (void) is relatively small.
Efektivitas Ekstrak Daun Belimbing Wuluh (Averrhoa Bilimbi L.) Sebagai Inhibitor Pada Baja St37 Dalam Medium Korosif NaCl 3% Aprilliani, Nia; Suka, Ediman Ginting; Suprihatin, Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1812

Abstract

The effectiveness of starfruitleaves extract as an inhibitor of St37 carbon steel in a corrosive medium of 3% NaCl had been researched. The concentration of starfruit leaves extract inhibitor was used 0%. 3%. 5% and 7% with immersion time of 4 and 8 days. Corrosion rate testing was done by weight loss method. The results of the research at each immersion time, showed that the optimum concentration of leaves starfruit extract to inhibit corrosion is 5% and the longer time immersion resulted in decreasing corrosion rate on St37 carbon steel. The maximum effectiveness of inhibitor occurred at 5% concentration with 8 days immersion time which is 78.57%. Characterization using Scanning Electron Microscopy (SEM) showed that the surface of steel looks smoother with white on sampleSt37-8-5 and St37-4-5 showing that tannin in starfruit leaves extract has been adsorbed on the steel surface while St37 carbon steel on St37-8-0 and St37-4-5 has a black steel surface with holes and cracks. Characterization using Energy Dispersive Spectroscopy (EDS) obtained oxygen element on sample St37-8-0 St37-4-0 greater concentration and Fe element smaller on sample St37-8-5 and St37-4-5.