Thermogravimetric analysis — a powerful tool for the refinement of the synthesis process of Hg-based superconductors

Tautkus, Stasys; Kazlauskas, Rolandas; Kareiva, Aivaras

doi:10.1016/s0039-9140(00)00317-9

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…1(a) shows the TG/DTA curves for the dried gel recorded in air. Gel is a complex network of polymers, formed by complex reactions, such as condensation and hydrolysis involving organic solvents and metal oxides [18]. The composition of the gel depends on the initial ingredients used in the sol-gel reaction.…”

Section: Resultsmentioning

confidence: 99%

Dielectric and impedance spectroscopic studies on (Ba0.5Sr0.5)Mnx(Ti0.95Fe0.05)1−xO3 ceramics synthesized by using sol–gel method

Akhtar

Mahmood

Iqbal

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Dielectric and impedance spectroscopic studies on (Ba0.5Sr0.5)Mnx(Ti0.95Fe0.05)1−xO3 ceramics synthesized by using sol–gel method

Akhtar

Mahmood

Iqbal

et al. 2015

Journal of Alloys and Compounds

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“…Between ~ 570 o C and ~ 700 o C, the decrease in weight is also larger for the Te-doped samples. This implies that there are larger amounts of impurity phase HgCaO 2 in those samples [10,12]. However, it is believed that the impurity phase can be removed by annealing the samples at 750 o C in the flowing O 2 [12].…”

Section: Thermogravimetry Analysis (Tga)mentioning

confidence: 99%

“…Its T c can be increased to 164 K under a high pressure of about 30 GPa [5]. Apart from the stated sealed quartz tube method, there are some methods used for fabricating the Hg-based copper oxide superconductors [5][6][7][8], for examples high pressure method [6] and sol-gel method [9,10]. For the case of sealed quartz tube method, it can still be divided into Hg vapour diffusion process [5][6][7] and cationexchange process [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement in Fabrication of Hg-1223 Superconductor by Te-Doping

et al. 2000

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The sealed quartz tube method is one of the usual methods used for sintering mercury-based copper oxide superconductors. By this method, precursor pellets are inserted into the quartz tube together with certain mass ratio to the reagent sample pellets for controlling the mercury vapour pressure. A certain amount of excess HgO is required to ensure the fabricated sample to have the desired composition. In our research, it was found that if a small amount of TeO 2 is added and mixed with the pulverized precursor after first calcination, Hg-1223 superconductors can be fabricated without using the precursor pellet and no excess HgO is required. Thus, the fabrication process can be simplified. As mercury and its oxide are toxic, if no excess Hg is involved, it is safe and good for the laboratory-environment. In this research, some amounts of 0.10 and 0.18 wt% (weigh percentage) of TeO 2 were added into the precursor, it is shown that the critical temperature of the fabricated samples is comparable to that of the undoped Hg-1223 samples. For 0.10 wt% of TeO2, the T c of the as-synthesized sample is about 116.7 K whereas the annealed Te-doped Hg-1223 is about 134.2 K. For 0.18 wt% of TeO 2 , the T c of the assynthesized and annealed samples are 115.8 K and 134.6 K, respectively. The phase structure of samples fabricated in this research has been analyzed by the X-ray diffraction technique. It shows that the Hg-1223 phase is dominated.

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Preparation and characterization of superconducting YBa2(Cu1−xCrx)4O8 oxides by thermal analysis

Nenartaviciene

Tõnsuaadu

Jasaitis

et al. 2007

J Therm Anal Calorim

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Thermogravimetric analysis — a powerful tool for the refinement of the synthesis process of Hg-based superconductors

Cited by 8 publications

References 23 publications

Dielectric and impedance spectroscopic studies on (Ba0.5Sr0.5)Mnx(Ti0.95Fe0.05)1−xO3 ceramics synthesized by using sol–gel method

Dielectric and impedance spectroscopic studies on (Ba0.5Sr0.5)Mnx(Ti0.95Fe0.05)1−xO3 ceramics synthesized by using sol–gel method

Improvement in Fabrication of Hg-1223 Superconductor by Te-Doping

Preparation and characterization of superconducting YBa2(Cu1−xCrx)4O8 oxides by thermal analysis

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