Microstructure andphase stability of Y–PSZ codoped with MgO or CaO prepared via polymeric route

Abstract

properties and a uniform tetragonal grain structure.9 Several factors aVect the stability of t-zirconia, including particle Fully dense nanostructured Y -PSZ ceramics with size, type and content of stabiliser, and heat treatment microstructural uniformity and stable high temperature regime.10 zirconia phases were prepared by hot pressing atThe use of codopants has recently attracted attention.11 1400°C. T he addition of 1 mol-% MgO or CaO asWhilst the fabrication of high performance zirconia requires codopant has a signi cant in uence on grain growth near full densi cation and high temperature processing, the characteristics. Addition of M gO tends to promote use of codopants enhances both the sintering characteristics densi cation during sintering and assists in the prepand stability of zirconia at relatively low temperature.12 aration of nanosized material (<200 nm grain size)The eVect of yttria as a codopant to Ce-P SZ on the with uniform microstructure. X -ray diVraction investimicrostructure and stability of zirconia has been investigations of samples hot pressed at 35 M Pa and 1400°C gated by Duh et al.13 Addition of either yttria or magnesia for 20 min and thermally etched at 1350°C for 3 h inhibits grain growth, improves sinterability, and enhances showed the presence of three zirconia phases, cubic, the phase stability. M gO was used as a codopant and tetragonal, and monoclinic. T he existence of the cubic sintering aid to Ce-P SZ to obtain near full densi cation at phase with the two other phases is associated with a relatively low isostatic pressure and processing temperne crystallite structure. T his desirable microstructure, ature.14 The addition of 3-5 wt-% CaO and 1-2 wt-% M gO combined with good stabilisation of the high temperas well as a mixture of CaO and M gO as codopants to ature phases, was recorded in nanostructured samples Y-P SZ improved the densi cation on ring at 1450codoped with 1 mol-% of either MgO or CaO.1500°C.15 BCT /485In practice innovation is still needed to synthesise high quality ultra ne powders with controlled morphology, Dr M ustafa

Characteristics of 8mol% yttria stabilized zirconia powder prepared by spray drying process

“…The dense thin layer of YSZ electrolyte for SOFC is made from fine powder of YSZ by processes such as tape casting, electrophoretic deposition, centrifugal casting and dip coating [6][7][8][9][10][11][12]. Though a number of processes such as co-precipitation, spray drying, spray pyrolysis, combustion synthesis, auto ignition, polymer precursor synthesis and oxalate precipitation route have been reported for preparation of yttria doped zirconia, most of them focus on tetragonal (3 to 5 mol% yttria stabilized zirconia) phase for structural application [13][14][15][16][17][18]6,19].…”

A novel polyaspartate precursor method for the synthesis of LiCayMn2−yO4nanoparticles for Li-ion batteries

“…The metal ions are uniformly distributed in the polymer gel and are attached to the polymer molecules through functional groups, such as OH and COOH, present in the polymer structure. Polyacrylic acid, poly vinyl alcohol and urea formaldehyde are polymeric materials and sucrose, acrylamide, acrylic acid etc are polymerizable materials that are used for the synthesis of metal oxide powders [12][13][14][15][16]. Another synthesis procedure that yields finely divided powder is the so-called combustion route.…”

Synthesis of Nanocrystalline Lanthanum Strontium Manganite Powder by the Urea–Formaldehyde Polymer Gel Combustion Route

“…Urea–formaldehyde (UF) polymer precursor synthesis is a simple method for preparation of ceramic oxide powders. This method has been applied to various oxide powders such as alumina, zirconia, and titania 14–17 . We are the first to apply this to the synthesis of LSM powder.…”

“…This method has been applied to various oxide powders such as alumina, zirconia, and titania. [14][15][16][17] We are the first to apply this to the synthesis of LSM powder. In this, UF is used as a gelling agent and as a fuel for combustion.…”