THE INFLUENCE OF SINTERING AND Sb CONTENT ON THE FORMATION OF HIGH TEMPERATURE SUPERCONDUCTING PHASE IN Bi(Pb)-Sr-Ca-Cu-O SYSTEM

1995 ◽  
Vol 09 (28) ◽  
pp. 3697-3713 ◽  
Author(s):  
S. A. SIDDIQI ◽  
BILQUEES AKHTAR ◽  
A. MAQSOOD
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Solid State Reaction Method ◽  
Superconducting Phase ◽  
Reaction Method ◽  
X Ray ◽  
Sintering Time ◽  
Different Temperatures ◽  
Time Periods ◽  
Scanning Electron

Six different compositions in ( Bi 1.5 Pb 0.5−x Sb x) Sr 2 Ca 2 Cu 3 O y (with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared by the solid state reaction method. Sintering at different temperatures (between 800–860° C) and time periods has been carried out in order to study its effect on T c values. The samples have been characterized by x ray powder diffraction (XRD), Scanning Electron Microscopy (SEM) and measurement of resistance at various temperatures. The study reveals that the incorporation of Sb up to x = 0.2 promotes the formation of a high-T c 2223 phase and large sintering time helps in reducing the number of unwanted phases. Compositions with x ≥ 0.3 result in the formation of a new monoclinic "4441 phase" (along with 2223 and 2212 minor phases) which is non-superconducting down to 77 K. Sintering time at 860°C for samples with x = 0.0, 0.1, 0.2 and 0.3 affects the respective T c values and the maximum values observed are 94 K, 96 K, 100 K and 87 K, respectively. The samples with x = 0.4 and 0.5 do not superconduct up to 77 K.

scholarly journals Pengaruh Suhu Sintering Terhadap Sintesis Silicon Carbide (SiC) Berbahan Dasar Abu Sekam Padi dan Grafit Pensil 2B

2015 ◽  
Vol 5 (01) ◽  
pp. 31
Author(s):  
Resky Irfanita ◽  
Asnaeni Ansar ◽  
Ayu Hardianti Pratiwi ◽  
Jasruddin J ◽  
Subaer S
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silicon Carbide ◽  
Rice Husk Ash ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Scanning Electron

The objective of this study is to investigate the effect of sintering temperature on the synthesis of SiC produced from rice husk ash (RHA) and 2B graphite pencils. The SiC was synthesized by using solid state reaction method sintered at temperatures of 750°C, 1000°C and 1200°C for 26 hours, 11.5 hours and 11.5 hours, respectively. The quantity and crystallinity level of SiC phase were measured by means of Rigaku MiniFlexII X-Ray Diffraction (XRD). The microstructure of SiC was examined by using Tescan Vega3SB Scanning Electron Microscopy (SEM). The XRD results showed that the concentration (wt%) of SiC phase increases with the increasing of sintering temperature. SEM results showed that the crystallinity level of SiC crystal is improving as the sintering temperature increases

scholarly journals Studi Awal Sintesis dan Karakterisasi Bi(Pb)-Sr-Ca-Cu-O dengan Penambahan Carbon Nanotube dan TiO2 Menggunakan Metoda Reaksi Padatan dan Proses Sintering Berulang [Preliminary Study Synthesis and Characterization of Bi(Pb)-Sr-Ca-Cu-O By Addition of Carbon Nanotube and TiO2 Using Solid Reaction Method and Recurrent Sintering Process]

Metalurgi ◽  
2017 ◽  
Vol 32 (3) ◽  
pp. 137 ◽  
Author(s):  
Rizki Syahfina ◽  
Bintoro Siswayanti ◽  
Sigit Dwi Yudanto ◽  
Agung Imaduddin ◽  
Nurul Suhada ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Nanotube ◽  
Volume Fraction ◽  
Morphological Structure ◽  
Solid State Reaction Method ◽  
Sintering Process ◽  
Reaction Method ◽  
X Ray ◽  
Scanning Electron

Bi1.6Pb0.4Sr2Ca2Cu3O10+δ with the addition of carbon nanotubes (CNT) and TiO2 have been synthesized using solid state reaction method with the repeated sintering process. 0.1 wt % of CNT and 5 wt% of TiO2 have been added to analyze the effect on the synthesizing of 2223 phases. The samples were analyzed using XRD (X-ray diffractometer) and SEM (Scanning Electron Microscopy). Based on the XRD results, 2223 and 2212 were formed. The addition of CNTs and TiO2 reduced the intensity of 2223 phases. This is due to the addition of CNTs and TiO2 as an impurity and prevent the formation of the phases. Also, the repeated sintering process led to the increase of 2223 phase, and the decrease of 2212 phase. However, the repeated sintering process in the B-CNT and B-TiO samples eliminates the impurities phase thus increasing the volume fraction 2223 and decreasing the volume fraction 2212. Based on morphological structure through SEM observation, the addition of CNT in the Bi(Pb)-2223 samples formed longer plates with large porosity spaces while the addition of TiO2 formed clumps on the Bi(Pb)-2223 morphological structure. However, the repeated sintering process improves the morphological structure of B-CNT and B-TiO becomes increasingly denser and the smaller porosity space.AbstrakTelah dilakukan sintesis Bi1,6Pb0,4Sr2Ca2Cu3O10+δ dengan penambahan CNT (carbon nanotube) dan penambahan TiO2 menggunakan metode reaksi padatan dengan proses sintering berulang. Penambahan CNT sebesar 0,1 %berat dan TiO2 sebesar 5 %berat dan sintering berulang dilakukan untuk mempelajari pengaruhnya terhadap pembentukan fasa 2223 beserta pengotornya, dan mempelajari perubahan morfologi Bi1,6Pb0,4Sr2Ca2Cu3O10+δ. Bi1,6Pb0,4Sr2Ca2Cu3O10+δ yang dibuat dianalisis dengan XRD (x-ray diffractometer) dan SEM (scanning electron microscopy). Berdasarkan hasil XRD, penambahan 0,1 %berat CNT dan TiO2 sebesar 5 %berat pada superkonduktor Bi(Pb)-2223 diketahui menghasilkan fasa 2223, fasa 2212, dan juga fasa pengotor. Namun proses sintering berulang mampu mengurangi fasa impuritas, meningkatkan fraksi volume 2223, serta menurunkan fraksi volume 2212.   Berdasarkan pengamatan struktur morfologi melalui SEM, penambahan CNT pada superkonduktor Bi(Pb)-2223 membentuk serpihan memanjang dengan ruang porositas yang besar sedangkan penambahan TiO2 membentuk gumpalan pada struktur morfologi Bi(Pb)-2223. Proses sintering berulang mampu memperbaiki struktur morfologi B-CNT dan B-TiO menjadi semakin rapat dan ruang porositas yang semakin kecil.  

scholarly journals Influence of Sintering Time on Superconducting Properties of Bi, Pb-2223 Compound Doped with Indium

2021 ◽  
Vol 2114 (1) ◽  
pp. 012066
Author(s):  
M M Abbas ◽  
A K Jassim
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Solid State Reaction Method ◽  
Temperature Phase ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Time ◽  
Low Temperature Phase ◽  
Scanning Electron

Abstract This work was performed to investigate the effect of sintering time on superconducting properties of Bi1.7In0.3Pb0.3Sr2Ca2Cu3O10+d samples prepared by solid state reaction method. The samples properties have been investigated structurally by X-ray diffraction and morphologically by scanning electron microscopy. Structural analysis showed that two superconducting phases coexist in the samples. High temperature Bi-2223 and low-temperature phase 2212 with orthorhombic structure for all samples. Four point probe method used to study the electrical properties of the samples and the results showed that increasing sintering time yields superconductor samples. The sintering time 140 h improves the microstructure of the superconductor and produces greater size platelets as well as leading to the highest TC value of 113 K and highest oxygen content value. Scanning electron microscopy shows increasing sintering time changed morphology of samples. Moreover plate grains of the high Bi-2223 phase appeared in most micrographs of the superconducting samples.

scholarly journals Investigations of M3Al8O15:Eu3+,Dy3+ (M = Ba, Ca, Mg) phosphors

2016 ◽  
Vol 34 (2) ◽  
pp. 412-417
Author(s):  
Esra Öztürk
Keyword(s):  
Electron Microscopy ◽  
Solid State Reaction Method ◽  
Morphological Characterization ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Three Samples ◽  
Scanning Electron ◽  
The Eu

AbstractIn this work, aluminate type phosphorescence materials were synthesized via the solid state reaction method and the photoluminescence (PL) properties, including excitation and emission bands, were investigated considering the effect of trace amounts of activator (Eu3+) and co-activator (Dy3+). The estimated thermal behavior of the samples at certain temperatures (> 1000 °C) during heat treatment was characterized by differential thermal analysis (DTA) and thermogravimetry (TG). The possible phase formation was characterized by X-ray diffraction (XRD). The morphological characterization of the samples was performed by scanning electron microscopy (SEM). The PL analysis of three samples showed maximum emission bands at around 610 nm, and additionally near 589 nm, 648 nm and 695 nm. The bands were attributed to typical transitions of the Eu3+ ions.

scholarly journals Synthesis Growth and Characterization of Mn doped La1.8Sr0.20CuO4

2011 ◽  
Vol 8 (1) ◽  
pp. 97-100
Author(s):  
Manish Verma ◽  
N. P. Lalla ◽  
D. M. Phase ◽  
V. K. Ahire
Keyword(s):  
Electron Microscopy ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Phase Purity ◽  
Reaction Method ◽  
X Ray ◽  
Temperature Method ◽  
Mn Doped ◽  
Scanning Electron

Polycrystalline samples of La1.8Sr0.20Cu1-yMnyO4 (0≤y≤0.15) were synthesized by solid state reaction method. The phase purity was confirmed by powder X-ray diffraction. The scanning electron microscopy was done on the La1.8Sr0.20Cu1-yMnyO4 (0≤y≤0.15) samples. The superconductivity and Transition temperature were studied by four probe resistivity temperature method. The transition temperatures were measured nearly 37 k and were unchanged on Mn doping at Cu site in La1.8Sr0.20CuO4.

Study of the Influence of Temperature on the Optical and Structural Properties of Dolomite

2020 ◽  
Vol 74 (10) ◽  
pp. 1280-1286
Author(s):  
Lucas Train Loureço ◽  
Celso de Araujo Duarte ◽  
Dietmar William Foryta ◽  
Bruno Guimarães Titon ◽  
Eleonora Maria Gouvêa Vasconcellos
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermal Treatment ◽  
X Ray Diffraction ◽  
Electron Dispersive Spectroscopy ◽  
Influence Of Temperature ◽  
X Ray ◽  
Different Temperatures ◽  
Influence Of Temperature On ◽  
Scanning Electron

The present work reports the results of structural and optical investigations in samples of natural dolomite, subjected to thermal treatment at different temperatures (500 ℃ to 700 ℃) and times (one up to three hours). The motivation is the evaluation of the changes that may occur in carbonaceous asteroids and meteorites, respectively, subjected to the action of the solar radiation and heated during the fall in the atmosphere. We carried out scanning electron microscopy, electron dispersive spectroscopy, X-ray diffraction, optical reflectance and photoluminescence measurements

Microwave Synthesis of BaTiO3 from BaCO3 and TiO2

2007 ◽  
Vol 336-338 ◽  
pp. 669-671
Author(s):  
Yan Yi Liu ◽  
Wei Pan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Microwave Oven ◽  
X Ray Diffraction ◽  
X Ray ◽  
Batio3 Powder ◽  
Domestic Microwave Oven ◽  
Intermediate Phases ◽  
Different Temperatures ◽  
Scanning Electron

BaTiO3 powder was synthesized from BaCO3 and TiO2 using a domestic microwave oven. The samples were synthesized under different temperatures with various holding times. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to examine the phase compositions and morphologies of the result samples. The main phase obtained at 950°C was BaTiO3, and the intermediate phases Ba2TiO4 and Ba4TiO9 were also detected. The pure, well-crystallized BaTiO3 powder could be obtained at 1050°C within 10 minutes and the particle size ranged from 300~500nm. In comparison with conventional synthesis, faster speed and finer grains could be achieved through microwave heating.

Effect of Sintering Temperature on (Bi2O3Fe2O3)0.8(Nb2O5)0.2

2017 ◽  
Vol 883 ◽  
pp. 3-6
Author(s):  
Sadia Tasnim Mowri ◽  
Quazi Delowar Hossain ◽  
M.A. Gafur ◽  
Aninda Nafis Ahmed ◽  
Muhammad Shahriar Bashar
Keyword(s):  
Electron Microscopy ◽  
Dielectric Property ◽  
Niobium Oxide ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Reaction Method ◽  
X Ray ◽  
Scanning Electron

(Bi2O3Fe2O3)0.8(Nb2O5)0.2 was synthesized by solid state reaction method. (Bi2O3Fe2O3)0.8(Nb2O5)0.2 was made for the investigation of X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Dielectric property. XRD pattern reveals that three phases were obtained with Bismuth Iron Niobium Oxide. SEM elicits that grain size increases with the enhancement of sintering temperature. Dielectric property decreases with the augmentation of frequency.

Study of Synthesis and Crystal Structure of Barium Cerate at High Temperatures

2017 ◽  
Vol 891 ◽  
pp. 473-477
Author(s):  
Renáta Verbová ◽  
Viktor Kavečanský ◽  
Pavel Diko ◽  
Samuel Piovarči
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Barium Cerate ◽  
X Ray Diffraction ◽  
Oxalate Precursor ◽  
X Ray ◽  
Different Temperatures ◽  
Average Size ◽  
Scanning Electron

Crystalline barium cerate was synthesized by oxalate coprecipitation from nitrates of barium and cerium [1]. The oxalate precursor prepared by chemical methods was calcined at different temperatures up to 950°C. The barium cerate was studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). X-ray diffraction investigation enables the determination of the phases that originate at different stages of synthesis and the crystal structure of final barium cerate, as well. From XRD patterns the average size of coherent regions was estimated by using Halder-Wagner method [2]. Both size and shape of crystallites were also studied by scanning electron microscopy. It was found that crystallites of barium cerate arise within the initial particles of the oxalate precursor.

Research of Rough Structure of Superhydrophobic Film

2011 ◽  
Vol 287-290 ◽  
pp. 253-256
Author(s):  
Zhan Shen Zheng ◽  
Rui Jiao Li ◽  
Pei Qi Yan ◽  
Rong Yang ◽  
Peng Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Scanning Electron

Superhydrophobic film was fabricated mainly by ethyl silicate (TEOS) and ethanol (EtOH) using sol-gel method. SiO2 gel and samples coated with SiO2 sol were calcined at different temperatures, and their morphology and composition were studied using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results indicate that increasing calcining temperature appropriately improved the bond of nanoparticles of film successfully. Furthermore, there were only amorphous SiO2 and hydroxyl existing in the calcined film which would be benefit for the further modification.

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