Effect of Yttria Content on the Zirconia Unit Cell Parameters

Abstract

The relationship between yttria concentration and the unit cell parameters in partially and fully stabilized zirconia has been reassessed, motivated by the need to improve the accuracy of phase analysis upon decomposition of t′-based thermal barrier coatings. Compositions ranging from 6 to 18 mol% YO 1.5 were synthesized and examined by means of high-resolution Xray diffraction. Lattice parameters were determined using the Rietveld refinement method, a whole-pattern fitting procedure. The revised empirical relationships fall within the range of those published previously. However, efforts to achieve superior homogeneity of the materials, as well as accuracy of the composition and lattice parameters, provide increased confidence in the reliability of these correlations for use in future studies. Additional insight into the potential sources for scatter previously reported for the transition region (~12-14 mol% YO 1.5 ), where tetragonal and cubic phases have been observed to coexist, is also provided. Implications on the current understanding of stabilization mechanisms in zirconia are discussed.

Yttria-stabilized zirconia/SrTiO3 oxide heteroepitaxial interface with symmetry discontinuity

“…The out-of-plane YSZ lattice parameter determined from the position of the (004) reflection is 5.169(2) Å , slightly larger than the bulk value of around 5.14 Å . 15,16 The (00l) orientation of the YSZ film is compatible with the fourfold in-plane symmetry observed by RHEED. In the case of the thickest film (64 ML), a second peak at 2h $30 indicates the existence of crystallites with (111) orientation; from the intensity of XRD peaks its amount is estimated to be below around 10%, small enough not to cause any observable additional spots in the RHEED patterns.…”

Synthesis of porous yttria-stabilized zirconia microspheres by ultrasonic spray pyrolysis

“…Table S1 shows the lattice parameters for all samples, averaging 5.1446 Å with small non-systematic deviations (0.001 Å) as a function of temperature. These numbers are all consistent with reports for zirconia powders with similar Y content [11]. Fig.…”

A comparative study on the performance of suspension plasma sprayed thermal barrier coatings with different bond coat systems

“…With an increase of the thermal treatment time, the Raman peak position shifted to a lower wave number. For the free standing coating, the Raman peak shift with annealing time can be attributed to decreasing anion disorder [37,38], which has been observed previously in APS YSZ coating. For the supported coating, there is another contribution from the stress.…”