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زیست شناسی::
فاز تتراگونال
Figure 3.12 Differences in surface energy of the monoclinic and tetragonal phases as a function of particle size in comparison to the free enthalpy of the monoclinic-tetragonal phase transformation DGmonoc-tetr.
At room temperature with particle sizes in the micrometer range, zirconia is monoclinic and transforms at 1475 K to the tetragonal phase, and later at 2650 K into the cubic phase.
As zirconia dissolves yttria (Y2O3) and yttria stabilizes the tetragonal phase, it would be interesting to see how the particle size and yttria content might in?
In the case of zirconia, the temperature of phase transformation was found to decrease with decreasing particle size, which led to the fact that the tetragonal phase - a high-temperature phase - is found at room temperature.
(i) with an increasing annealing temperature, equivalent to an increasing grain size, a decrease in the lattice constant of the cubic phase occurs, and (ii) there is a quasicontinuous transition from the cubic phase to the tetragonal phase.
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