Regularities of formation of complex oxides with the fluorite structure in the ZrO2–Y2O3 system

Upconversion Visible Light Emission in Yb/Pr Co-Doped Yttria-Stabilized Zirconia (YSZ) Single Crystals

“…Examples of Raman spectra of Pr/Yb: YSZ crystal samples with Yb 2 O 3 concentrations of 2.0 mol%, 2.5 mol%, and 3.0 mol%, are shown in Figure 2 for the range 300-1000 cm −1 . Only one peak near 619 cm −1 was detected with each sample, and its energy is very close to that reported for the cubic phase of YSZ (~620 cm −1 ) [27]. Thus, all of the prepared samples are in the stable cubic-phase structure.…”

“…Raman spectroscopy is a convenient method for distinguishing betwee structures of ZrO2: the monoclinic phase has 18 peaks (9Ag + 9Bg) [24], th phase 6 peaks (A1g + 2B1g + 3Eg) [25], and the cubic phase just one peak (F2g) [26 of Raman spectra of Pr/Yb: YSZ crystal samples with Yb2O3 concentrations o 2.5 mol%, and 3.0 mol%, are shown in Figure 2 for the range 300-1000 cm peak near 619 cm −1 was detected with each sample, and its energy is very c reported for the cubic phase of YSZ (~ 620 cm −1 ) [27]. Thus, all of the prepa are in the stable cubic-phase structure.…”

Crystal growth, structure and optical properties of Pr3+-doped yttria-stabilized zirconia single crystals*

“…Although the XRD results from the Pr-doped YSZ crystals are all consistent with the cubic phase, the patterns of the cubic and tetragonal phases of ZrO 2 are quite similar, and there is considerable overlap in their diffraction peaks at 30 • , 35 • , 50 • , and 60 • . [25] Therefore, further investigation of the structures of the Pr-doped YSZ crystals were performed using Raman spectroscopy, since this can clearly distinguish the two phases, [26] which are determined by the symmetry of the crystal unit cell and the number of types of atom. The tetragonal zirconia (t-ZrO 2 ) structure is characterized by six Raman active modes (A 1g + 2B 1g + 3E g ), [27] whereas c-ZrO 2 has only one Raman active mode (F 2g ) at about 625 cm −1 .…”

Structure of nanoparticles in the ZrO2-Y2O3 system, as obtained under hydrothermal conditions

“…Due to the presence of several polymorphic modifications [1][2][3][4] zirconium dioxide is of interest as a model for studying the effect of the synthesis methods and parameters on the formation of nanocrystals with different structure [5][6][7][8][9][10][11][12][13][14][15]. Zirconium dioxide based nanomaterials with various structures, morphologies, and particle size parameters have a wide range of applications [16][17][18][19][20][21][22][23][24][25][26][27], which makes the above studies relevant from a practical point of view as well.…”