Determination of the structure of the cubic phase in high-ZrO₂Y₂O₃-ZrO₂alloys by convergent-beam electron diffraction

Abstract

1994) Determination of the structure of the cubic phase in high-ZrO 2 Y 2 O 3 -ZrO 2 alloys by convergent-beam electron diffraction, Philosophical Magazine A, 70:1, 185-200,

L12- and L10-like cation-ordered structures in ZrO2–Y2O3 ceramics

“…2(a) and discussed in detail. In the model put forward by McClellan et al, 19 oxygen ions were assumed to move along 〈111〉 directions with suggested displacement of about 0.03 nm. The region of c-ZrO 2 was marked by letter C, and the regions of L1 2 -and L1 0 -like cation-ordered structures were marked by letters L and O, respectively.…”

“…The yttrium content was different in different regions. The simulated diffraction patterns (a, b) and HREM images (c) along [100] direction using the structure model proposed by Torng et al 19 The direct beams were not drawn just for clarity. 2(a), showing it was in mixing state of the starting powder.…”

“…[1][2][3][4][5][6][7][8][9] On the selected-area electron diffraction patterns (SAEDPs) of cubic ZrO 2 (c-ZrO 2 ), extra reflections having (odd odd even) and 1 ⁄2 (odd odd odd) type indices were frequently found in addition to normal reflections of the isostructure of the mineral fluorite. 7,[10][11][12][13][14][15][16][17][18][19] Recently, we found that Y 0.25 Zr 0.75 O 2-x and Y 0.5 Zr 0.5 O 2-y phases formed by yttrium segregation within the grains. 7,[10][11][12][13][14][15][16][17][18][19] Recently, we found that Y 0.25 Zr 0.75 O 2-x and Y 0.5 Zr 0.5 O 2-y phases formed by yttrium segregation within the grains.…”

Ab initioprediction of ordered ground-state structures inZrO2-Y2O3

“…Numerous experimental studies have measured the direction of relaxation of oxygen, Zr, and Y away from cubic fluorite sites. 17,19,[22][23][24][25][26] Frey et al 14 offered a thorough review. Computational studies of ordered structures show that the elastic and electrostatic interactions push the structure in opposite directions.…”

Origin of the hump on the left shoulder of the X-ray diffraction peaks observed in Y2O3-fully and partially stabilized ZrO2

“…Accordingly, various microstructural studies of stabilized zirconia have been conducted [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Many microstructural studies on its hardening mechanism have been conducted by examining phase transformations and performing phase determination by X-ray diffractometry (XRD) [7][8][9][19][20][21][22].…”