Yttria stabilised zirconia has been prepared using a simple sol-powder coating technique. The polymeric yttria sol, which was prepared using 1,3 propanediol as a network modifier, was homogeneously mixed with nanocrystalline zirconia powder and it showed a dual function: as a binder which promoted densification and a phase modifier which stabilised zirconia in the tetragonal and cubic phases. Thermal analysis and X-ray diffraction revealed that the polymeric yttria sol which decomposed at low temperature into yttrium oxide could change the m {sup {yields}} t phase transformation behaviour of the zirconia, possibly due to the small particle size and very high surface area of both yttria and zirconia particles allowing rapid alloying. The sintered samples exhibited three crystalline phases: monoclinic, tetragonal and cubic, in which cubic and tetragonal are the major phases. The weight fractions of the individual phases present in the selected specimens were determined using quantitative Rietveld analysis.

Based on the above information increasing the amount of Yttria will increase the stabilization but not more than 50% of the mixture

6-8 weight % Y2O3 is the optimum for the desired properties of the 'non-transformable' tetragonal. less gives more monoclinic-tetragonal transformations. more gives all cubic. there are literally books written on the subject and more reading is required.

[A] A FULLY (cubic) STABILIZED zirconia is obtained with a Y2O3-content more than7 mol% , while a Y2O3-content of about 2-6 mol% gives a PARTIALLY STABILIZED zirconia[ Pls. see fig(a) of the attached file which gives O2 self- diffusability[D0] as a function of Y2O3 mole fraction—ZOOM 200%]]

[B]The first part of this question has already been answered by me under your question

[What are the effects of adding yttria stablizer to zirconia, and what

is best amount to be added?]

For Khalid Tayeb

Continuing with my arguments on YSZ, I ,humbly, authenticate my above given % of fully / partially stabilized YSZ for your perusal.The curve regarding the stability and structure of YSZ are already lying with you.

Beloging to an old school of thought, I think it a primary duty of a researcher to quote only those % which are already reported in the literature; without altering their numerical values unless he/ she himself/ herself has performed the experiment/s. I, thus,

reproduce the lines written in the following reference in Toto.

Pls. CLICK under the heading ;

YSZ

Reach Images of Structure of YSZ

Oxygen Ion Conductivity in Ytrria Stabilized Zirconia

“ Yttria is the most commonly used dopant for stabilizing the cubic phase of zirconia; a fully (cubic) stabilized zirconia is obtained with a Y2O3-content of >7 mol% [2], while a Y2O3-content of about 2-6 mol% gives a partially stabilized zirconia.”