Surface dependent segregation of Y2O3 in t-ZrO2
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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Yn: Philosophical Magazine Letters, Cyfrol 85, Rhif 9, 01.09.2005, t. 445-453.
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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T1 - Surface dependent segregation of Y2O3 in t-ZrO2
AU - Stanek, CR
AU - Grimes, RW
AU - Rushton, MJD
AU - McClellan, KJ
AU - Rawlings, RD
PY - 2005/9/1
Y1 - 2005/9/1
N2 - Atomistic simulation techniques have been used to predict the preferential segregation of Y3+ ions to the (100), (101) and (110) surfaces of tetragonal zirconia (t-ZrO2). It is found that segregation energetics vary greatly between surfaces. In particular, dopant ions segregate to the top of the (101) surface. Conversely, although they also segregate towards the (100) and (110) surfaces, Y3+ becomes trapped just beneath these surfaces. For all of these surfaces, segregation effects are negligible below 12 angstrom. The surface orientation dependence will result in significant variations in the concentration of yttrium at different surfaces. As a consequence, properties that are a function of defect concentration and distribution will be surface dependent. Predictive understanding of such segregation effects will provide the possibility of better engineered devices for a variety of thermal and electrochemical applications.
AB - Atomistic simulation techniques have been used to predict the preferential segregation of Y3+ ions to the (100), (101) and (110) surfaces of tetragonal zirconia (t-ZrO2). It is found that segregation energetics vary greatly between surfaces. In particular, dopant ions segregate to the top of the (101) surface. Conversely, although they also segregate towards the (100) and (110) surfaces, Y3+ becomes trapped just beneath these surfaces. For all of these surfaces, segregation effects are negligible below 12 angstrom. The surface orientation dependence will result in significant variations in the concentration of yttrium at different surfaces. As a consequence, properties that are a function of defect concentration and distribution will be surface dependent. Predictive understanding of such segregation effects will provide the possibility of better engineered devices for a variety of thermal and electrochemical applications.
U2 - 10.1080/09500830500318833
DO - 10.1080/09500830500318833
M3 - Erthygl
VL - 85
SP - 445
EP - 453
JO - Philosophical Magazine Letters
JF - Philosophical Magazine Letters
SN - 0950-0839
IS - 9
ER -