yttria การใช้

• The electrolyte is Yttria-stabilized zirconia ( YSZ ).
• The yttria / magnesia binary system is an ideal model system for nanocomposite formation.
• Yttria is used as a sintering additive in the production of porous silicon nitride.
• A major consideration is the low emissivity of yttria, which limits background radiation upon heating.
• Klaproth preferred the name " beryllina " due to the fact that yttria also formed sweet salts.
• Nanocomposites of yttria and magnesia have been produced with an average grain size of ~ 200 nm.
• GE's transparent Yttralox was followed by GTE's lanthana-doped yttria with similar level of additive.
• Raytheon perfected and characterized its undoped polycrystalline yttria, while lanthana-doped yttria was similarly developed by GTE Labs.
• Raytheon perfected and characterized its undoped polycrystalline yttria, while lanthana-doped yttria was similarly developed by GTE Labs.
• This geochemical divide is reflected in the first two rare earths that were discovered, yttria in 1794 and ceria in 1803.
• The first full scale missile domes of transparent yttria manufactured from nanoscale ceramic powders were developed in the 1980s under Navy funding.
• First results on yttria-stabilized zirconia co-doped with europia ( YSZ : Eu ) powders were published in 2000.
• Renewed interest in yttria windows and domes has prompted efforts to enhance mechanical properties by using nanoscale materials with submicrometer or nanosized grains.
• Of the 47 minerals discovered at Barringer Hill, gadolinite, a radioactive form of yttria, triggered the most interest at the time.
• The most widely studied systems are those involving rare earth metal oxides, Ln 2 O 3, including yttria, Y 2 O 3.
• This ability to conduct O 2 " ions makes yttria-stabilized zirconia well suited for application as solid electrolye in solid oxide fuel cells.
• Yttria is fully transparent from 3 5 micrometers, but lacks sufficient strength, hardness, and thermal shock resistance for high-performance aerospace applications.
• It is now thought that workers using double sodium or potassium sulfates to remove ceria from yttria inadvertently lost the terbium into the ceria-containing precipitate.
• Johan Gadolin discovered yttrium's oxide in Arrhenius'sample in 1789, and Anders Gustaf Ekeberg named the new oxide " yttria ".
• What is now known as terbium was only about 1 % of the original yttria, but that was sufficient to impart a yellowish color to the yttrium oxide.