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SUMMARY:Doped bismuth oxide materials for low-temperature solid oxide fuel
  cell electrolyte
DTSTART;VALUE=DATE-TIME:20191111T150000Z
DTEND;VALUE=DATE-TIME:20191111T160000Z
DTSTAMP;VALUE=DATE-TIME:20260614T223139Z
UID:indico-contribution-2111@events.saip.org.za
DESCRIPTION:Speakers: Masilo Ramafemo (University of Witwatersrand)\nBismu
 th-oxide based electrolytes are well known for their high oxide ion conduc
 tivity at intermediate temperatures (300-700°C). Indeed\, the defect fluo
 rite structured δ-phase of Bi2O3 shows the highest known oxide ion conduc
 tivity of any material. Unfortunately\, this phase is only stable above 73
 0°C and much research has been carried out on stabilizing this phase to l
 ower temperatures through solid solution formation with other oxides. The 
 aim is to work towards a better understanding of these materials in terms 
 of structure and ion conductivity so that better SOFC electrolytes can be 
 designed to run at lower temperatures (between 300 – 600°C). These mate
 rials will thus be studied at elevated temperature ranges. The longer-term
  stability of promising materials will also be investigated to determine h
 ow thermal cycling degrades the material and affects the conductivity. \nT
 he effects of Y3+ and Pb2+ double substitutions in Bi2O3 has been examined
  in the Bi2O3-PbO-Y2O3 system using X-ray powder diffraction (XRD)\, diffe
 rential thermal analysis/thermal gravimetry (DTA/TG)\, and VT-Raman spectr
 oscopy. All these characterization techniques  show that samples having Y3
 + as a major substituent have a single (δ-phase) phase structure. Pb2+ is
  isoelectronic with Bi3+\, thus the aim of including Pb2+ is to eventually
  try and gain insight into the effects of the lone pair of electrons in th
 e mobility of the oxide ions through the lattice.\n\nhttps://events.saip.o
 rg.za/event/173/contributions/2111/
LOCATION: 1st Floor : Gold and Sliver Rooms and Sundowners (12 floor)
URL:https://events.saip.org.za/event/173/contributions/2111/
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