Bulletin of Materials Science

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Study of Josephson effects in microbridges of Bi-Sr-Ca-Cu-O films made by spray pyrolysis
Bulletin of Materials Science - Tập 14 - Trang 1119-1123 - 1991
D K Walia, A K Gupta, G S N Reddy, V N Ojha, V S Tomar, Neeraj Khare, N D Kataria, K C Nagpal
Superconducting Bi-Sr-Ca-Cu-O (2212) films were prepared by spraying stoichiometric aqueous solutions of nitrates of bismuth, strontium, calcium and copper on heated MgO (100) substrates and subsequent annealing in air. TheR-T curves of the films show metallic behaviour above the superconducting transition temperature.T c (R=0) is observed between 80 and 85 K. Annealing temperature has a profound ... hiện toàn bộ
Thư giãn điện môi trong một hỗn hợp polymer được pha dop cadmium chloride Dịch bởi AI
Bulletin of Materials Science - Tập 42 - Trang 1-16 - 2019
Basavarajeshwari M Baraker, Blaise Lobo
Các quá trình thư giãn phụ thuộc vào nhiệt độ và tần số trong các phim của một hỗn hợp polymer bao gồm copolymer polyvinyl alcohol (PVA)/polyvinyl acetate (PVAc) được trộn với polyvinyl pyrrolidone (PVP) theo tỷ lệ bằng nhau theo trọng lượng, và được doping với muối kim loại vô cơ, cadmium chloride $$(\hbox {CdCl}_{2})$$, ở mức độ doping 0.0 wt% và 10.2 wt%. Sử dụng quang phổ thư giãn điện môi (DR... hiện toàn bộ
Synthesis and thermophysical studies of polyanilines
Bulletin of Materials Science - Tập 42 - Trang 1-9 - 2019
K S Patil, P H Zope, U T Patil, P D Patil, R S Dubey, G R Gupta
Aniline was polymerized under different experimental conditions such as interfacial polymerization, rapid mixing in hydrochloric acid medium and classical bulk polymerization method using p-toluene sulphonic acid. The resulting polyanilines were characterized by infrared, X-ray diffraction, conductance and scanning electron microscopic analysis. The main emphasis of the paper is to study the therm... hiện toàn bộ
Effect of stabilizer on the morphology of Au@TiO2 spheres: a combined experimental and theoretical study
Bulletin of Materials Science - Tập 39 - Trang 1685-1690 - 2016
JIAN QI, XUECHAO GAO, QUAN JIN
In this study, two different particle sizes of Au nanoparticles (NPs) were synthesized using two different stabilizers, and then two different morphologies Au@TiO2 hollow spheres were obtained when the corresponding Au NPs solutions were added to the TiF4 ethanol–water solution under hydrothermal condition. The computational simulation is employed to provide the fundamental support to explain why ... hiện toàn bộ
Macroporous silica-alumina composites with mesoporous walls
Bulletin of Materials Science - Tập 24 Số 2 - Trang 211-214 - 2001
Gautam Gundiah
Electrical and magnetic studies of iron (III) vanadate
Bulletin of Materials Science - Tập 18 - Trang 229-236 - 1995
N Suresh Rao, O G Palanna
Iron(III) vanadate (FeVO4) is an n-type semiconductor between 300 and 800 K. Electrical conduction in this phase occurs due to small deviation from oxygen stoichiometric composition. The mechanism of electrical transport is of a thermally activated hopping of charge carriers (electrons) on equivalent iron lattice sites. The FeVO4 obeys Curie-Weiss law between 80 and 300 K. The measured magnetic mo... hiện toàn bộ
Transient charging and discharging current study in pure PVF and PVF/PVDF fluoro polyblends for application in microelectronics
Bulletin of Materials Science - Tập 34 - Trang 105-112 - 2011
A K GUPTA, R BAJPAI, J M KELLER
The transient current were analysed by considering the effect of variation of forming time, temperature, field and composition of blend specimens. Measurements indicated that transient charging and discharging currents exhibited thermally activated character but did not show mirror image behaviour at different temperatures and field values. The log $\emph{I}$ –log $\emph{t}$ plots were found to fo... hiện toàn bộ
Gibbs’ energy of formation of YBa2Cu3O7-x (tetragonal)
Bulletin of Materials Science - Tập 14 - Trang 983-987 - 1991
A M Azad, O M Sreedharan, K T Jacob
The high temperature ceramic oxide superconductor YBa2Cu3O7-x (1–2–3 compound) is generally synthesized in an oxygen-rich environment. Hence any method for determining its thermodynamic stability should operate at a high oxygen partial pressure. A solid-state cell incorporating CaF2 as the electrolyte and functioning under pure oxygen at a pressure of 1·01 × 105 Pa has been employed for the determ... hiện toàn bộ
Exploring the electrochemical properties of Cu-substituted Li2CoTi3O8 as anode material for lithium-ion batteries
Bulletin of Materials Science - - 2022
Motaz G Fayed, Saad G Mohamed, Yosry F Barakat, E E El-Shereafy, M M Rashad
Spinel Li2Co1–xCuxTi3O8 nanopowders (x = 0, 0.25, 0.5 molar ratios) were synthesized via a sol–gel auto-combustion scheme. The preparation conditions like annealing temperature, Cu2+ ion substituted on the crystallinity, microstructure and chemical composition were inspected using X-ray diffraction, X-rays photoelectron spectroscopy and field emission scanning electron microscopy. Furthermore, the... hiện toàn bộ
Synthesis and characterization of CuO nanoparticles using strong base electrolyte through electrochemical discharge process
Bulletin of Materials Science - Tập 39 - Trang 469-478 - 2016
PURUSHOTTAM KUMAR SINGH, PANKAJ KUMAR, MANOWAR HUSSAIN, ALOK KUMAR DAS, GANESH CHANDRA NAYAK
In the present study, cupric oxide (CuO) nanoparticles were synthesized by electrochemical discharge process using strong base electrolytes. The experiments were carried out separately using NaOH and KOH electrolytes. The mass output rate and the crystal size were obtained with variation of the rotation speed of magnetic stirrer for both types of electrolytes. The mass output rate of CuO nanoparti... hiện toàn bộ
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