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  • 1
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: The ruthenocuprates family is a very interesting class of materials, because of thecoexistence of superconductivity and magnetic ordering. Ruthenocuprates includeRuSr2RECu2O8 and RuSr2(RE,Ce)2Cu2O10-[removed info] (RE = rare earth elements or Y). It is possible tosynthesize samples of these phases with Gd, Eu or Sm with normal synthesis conditions. Forthe others high-pressure high-temperature (HPHT) synthesis is required. We had successfullysynthesized the RuSr2Tb1.5Ce0.5Cu2O10 by HPHT technique, starting from RuO2, SrO2, Tb4O7,CeO2, CuO and Cu. Around 300 mg of the mixture was allowed to react in a flat-belt-typehigh-pressure apparatus at 6GPa and 1200 ºC – 1550 ºC. The optimised temperature ofsynthesis was found to be in the range between 1350 ºC – 1450 ºC. The as-synthesizedcompound crystallized with a structure belonging to the space group I4/mmm. DC magneticsusceptibility versus temperature plot for RuSr2Tb1.5Ce0.5Cu2O10 in an applied field of 10 Oedemonstrated magnetic transition at 150 K but the superconducting transition was not clearlyobserved. To our knowledge this is the first successful synthesis of the Tb based Ru-1222phase
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The formation of BaZrO3 from very fine (70–90 nm) ZrO2 powders and coarser (∼1 μm) BaCO3 powders has been studied in dry and humid air up to 1300°C using TGA/DTA, XRD, SEM, TEM, and EDS microanalysis. In the temperature range 900°–1100°C, barium is rapidly transported at the surface of the ZrO2 particles and reacts, forming BaZrO3. The compound grows as a concentric layer with gradual consumption of the central ZrO2 particle. The overall formation kinetics of BaZrO3 is well described by a diminishing core model, and the most likely rate-determining step is a phase-boundary process at the ZrO2–BaZrO3 moving interface. The size and shape of the final particles is generally determined by the morphology of the starting ZrO2 particles and not by that of the BaCO3. The reaction is faster in humid air than in dry air, and the activation energy decreases from 294 kJ·mol−1 (dry air) to 220 kJ·mol−1 (humid air). When the fraction reacted is 〉80–90 mol%, the reaction rate rapidly decreases.
    Type of Medium: Electronic Resource
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