yttria


Also found in: Dictionary, Wikipedia.
Related to yttria: yttrium oxide

yttria

[′i·trē·ə]
(inorganic chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
As the yttria concentration increased, the total oxidation time and the rate of hydrogen evolution decreased.
Increasing the yttria concentration in the Fe/YSZ decreased the total oxidation time and the rate of hydrogen evolution.
Yoshiki et al., studied the wear of Yttria stabilized Zirconia in the femoral head.
Though zirconia (Zr[O.sub.2]) and Yttria stabilized Zirconia(Y-Zr[O.sub.2]) have wider applications such as hip and knee prostheses, hip joint heads, temporary supports, tibial plates, dental crowns, not much literature reports are available on the studies of this oxide ceramics as drug carriers.
The Zirconia and yttria stabilized Zirconia was prepared by combustion method using urea-nitrate mixture.
The dissolution study of CFH added yttria stabilized zirconia pellet indicates that nearly 58.6% of the drug was released within 30 minutes.
In a second test, another yttria slurry was made according to the second run in Table 1.
It is shown that the main cause of aging in an yttria-silica slurry is the dissolution of yttria and, subsequently, readsorption of dissolved cationic species on the surface of negatively charged colloidal silica.
Next, the coatings were dried and infiltrated with colloidal yttria, colloidal zirconia or ammonium zirconium carbonate solution for 30 min.
Sahar Salehi, one of the researchers, said the study was aimed at a "synthesis of composite nanopowder of hydroxyapatite for reconstruction of damaged hard tissues".Noting that "the attachment and adhesion of cells to nanometric materials followed by their multiplication and growth is done better compared to micrometric materials", she said and added, "Hydroxyapatite of 40 to 80 nanometers and zirconia of 20 to 30 nanometers were produced in this research.""The zirconia yielded in this research is transformed to cubic structure as a result of increasing yttria content and to tetragonal structure at the presence of 3 wt% of yttria.
Examples of specific topics discussed in the volume include low-temperature fabrication of polycrystalline yttrium aluminum garnet powder via a mechanochemical solid reaction of nanocrystalline yttria with transition alumina, formation of hollow zinc oxide by oxidation and subsequent thermal treatment, antifungal effectiveness of nanosilver colloid against rose powdery mildew in greenhouses, reflectometry studies of mesoporous silica thin films, methane storage on surface modified activated carbons, and thermal behaviors and fracture toughness of polyurethane- dispersed difunctional epoxy resins.