Sol-gel synthesis and superconducting properties of HgBa2CaCu2O6+δ

Bryntse, I.; Kareiva, Aivaras

doi:10.1016/0921-4534(95)00392-4

Cited by 19 publications

(6 citation statements)

References 37 publications

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“…6). In both cases the peak pattern corresponds to the characteristic YAG pattern (JCPDS ®le [33][34][35][36][37][38][39][40]) and no formation of the crystalline dopant oxide CeO 2 was observed, till 1000 ³C. Further, the IR spectra of the calcined samples show no extra peaks or features when compared with the spectra of pure YAG ceramic (Fig.…”

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 87%

“…The tendency of yttrium containing gels to react with atmospheric CO 2 is well known. The thermal decomposition behaviour associated with exothermic effects in the DTA curve indicates an autoignited combustion process 34 arising, probably, from exothermic anionic oxidation±reduction reactions between glycolate, acetate and nitrate ions. Since the structures of the gel complexes are not known, a more detailed interpretation of the decomposition mechanism is complicated.…”

Section: Thermal Behaviourmentioning

confidence: 97%

“…Y 2 Al 4 O 9 , YAlO 3 ) which are transformed at higher temperature (w900 ³C) into Y 3 Al 5 O 12. The diffractogram at 1000 ³C showed all the peaks corresponding to the YAG phase (JCPDS ®le [33][34][35][36][37][38][39][40]) 61 (Fig. 5a).…”

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 99%

“…For a comparative evaluation of solution and solid state syntheses, the XRD pro®le of the material obtained by thermolysis (1000 ³C, 24 h) of a physical mixture of aluminium nitrate and yttrium oxide is reproduced in Fig. 5c which shows the presence of several species other than the desired YAG phase (JCPDS ®le [33][34][35][36][37][38][39][40]). 61 The XRD patterns of the Ce±YAG ceramics are shown in Fig.…”

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 99%

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Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol–gel methods

Veith¹,

Mathur²,

Kareiva³

et al. 1999

J. Mater. Chem.

281

147

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Section: Powder X-ray Diffraction Studiesmentioning

confidence: 87%

Section: Thermal Behaviourmentioning

confidence: 97%

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 99%

Section: Powder X-ray Diffraction Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol–gel methods

Veith¹,

Mathur²,

Kareiva³

et al. 1999

J. Mater. Chem.

281

147

View full text Add to dashboard Cite

“…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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