The superconducting bismuth-based mixed oxides
نویسندگان
چکیده
منابع مشابه
Synthesis and Characterization of Ga-Doped Bismuth Based Superconducting Materials
A series of bismuth based superconducting materials doped with galliumBi Pb Sr Ca Cu Ga O 1.7 0.4 2 2 3-x x y (x = 0.0, 0.02, 0.04, 0.06, 0.08 and 0.10) was synthesized by Simple solid-state reaction method. The samples were characterized by X-ray diffraction, EDX analysis and electrical resistivity and ac magnetic susceptibility measurements. All the samples consist of both low-T (2212) and Hi...
متن کاملSynthesis and Characterization of MnO2-Based Mixed Oxides as Supercapacitors
Mn/Pb and Mn/Ni mixed oxide were prepared at ambient temperature by reduction of KMnO4 with Mn, Pb, and Ni salts. This low-temperature approach provides amorphous structure of the active material. The specific capacitance of pure MnO2 was estimated to be 166 F/g and increased to 210 and 185 F/g for Mn/Ni and Mn/Pb oxides, respectively. The carbon loading was optimized at 20 wt %. Based on a sin...
متن کاملPrediction of superconducting iron–bismuth intermetallic compounds at high pressure
The synthesis of materials in high-pressure experiments has recently attracted increasing attention, especially since the discovery of record breaking superconducting temperatures in the sulfur-hydrogen and other hydrogen-rich systems. Commonly, the initial precursor in a high pressure experiment contains constituent elements that are known to form compounds at ambient conditions, however the d...
متن کاملSynthesis and thermal properties of superconducting copper oxides
Aspects of the synthesis and of the characterization of the thermochemical properties of high-T, mixed copper oxides, in particular of the Y-Ba-Cu-0 system and of the Bi-Ca-Sr-Cu-0 system are discussed. Related studies are based on conventional thermoanalytical tools such as thermogravimetry and differential thermal analysis. Facilities for the determination of the partial pressures of the gase...
متن کاملThermodynamic desorption of oxygen in high Tc superconducting oxides
We measure as a function of temperature and composition the equilibrium pressure of desorbed oxygen from superconducting oxides MBa2 Cu3 O6+x (M=Eu, Y). Using the Lacher model we determine the enthalphy of formation of the excess oxygen x (-0.7 eV/atom) as well as the repulsive O-O interaction energy (0.11eV). We also observe that there is a spontaneous reabsorption of the oxygen above about 60...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 2002
ISSN: 0108-7673
DOI: 10.1107/s0108767302087457