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SUMMARY:In situ X-ray diffraction studies of Ce0.9Y0.1O2-δ\, Ce0.65Pr0.25
 Y0.1O2-δ and Pr6O11
DTSTART;VALUE=DATE-TIME:20160705T090000Z
DTEND;VALUE=DATE-TIME:20160705T100000Z
DTSTAMP;VALUE=DATE-TIME:20260310T101641Z
UID:indico-contribution-1302@indico.inp.nsk.su
DESCRIPTION:Speakers: Zakhar Vinokurov (BIC SB RAS)\nCe0.9Y0.1O2‑δ(YDC)
 \, Ce0.65Pr0.25Y0.1O2‑δ(YPDC) and Pr6O11 were synthesized by Pechini te
 chnique and sintered at 1100°C. The samples were characterised by X-ray d
 iffraction (XRD) and TEM methods.\n\nIt has been found that oxides behave 
 differently after change of the ambient oxygen partial pressure (pO2). In 
 situ XRD experiments showed that YPDC cell reversibly expands after change
  to the lower pO2 at 500-600C due to the oxygen loss while YDC didn't show
  any significant structure changes. For the Pr6O11 the following structure
  changes were observed at the same conditions: monoclinic → cubic → tr
 igonal.\n\nWe also estimated the oxygen mobility coefficients(kchem - oxyg
 en surface exchange coefficient and Dchem - oxygen chemical diffusion coef
 ficient) of all samples by analysis of the cell volume relaxation (CVR) cu
 rves obtained from the XRD data after abrupt change of the oxygen partial 
 pressure from 100 mBar to 10 mBar. Since no relaxation was observed for YD
 C\, kchem and Dchem could not be calculated. For YPDC process is limited b
 y surface exchange thereby only kchem could be calculated. The following k
 chem values were determined for YPDC 1.3*10^(-4) cm/s at 500 °C and 1.6*1
 0^(-4) cm/s at 600 °C. For Pr6O11 both kchem and Dchem could be calculate
 d simultaneously and were about 5.0·10^(-4) cm/s and 5.0·10^(-7) cm^2/s 
 at 500 °C.\n\nIn situ XRD experiments were carried out with involvement o
 f equipment belonging to the shared research center “SSTRC”.\n\nhttps:
 //indico.inp.nsk.su/event/3/contributions/1302/
LOCATION:Budker INP 2nd and 3rd floors
URL:https://indico.inp.nsk.su/event/3/contributions/1302/
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