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SUMMARY:Effect of annealing time on the structure\, morphology and optical
  properties of mixed phases of barium and strontium aluminates doped with 
 0.1% Tb3+ prepared by citrate sol-gel method
DTSTART;VALUE=DATE-TIME:20210729T101500Z
DTEND;VALUE=DATE-TIME:20210729T103000Z
DTSTAMP;VALUE=DATE-TIME:20260418T172933Z
UID:indico-contribution-7120@events.saip.org.za
DESCRIPTION:Speakers: Mpho Maluleka (Sefako Makgatho Health Sciences Unive
 rsity)\nCitrate sol-gel method was used to successfully prepare mixed phas
 es of strontium and barium aluminate powders doped with 0.1% Tb3+. All pow
 ders were annealed at 1000 oC while varying the annealing time (AT) from 0
 .5 – 4 hours (h). The X-ray powder diffraction (XRD) results revealed th
 at the prepared powders is the mixture of phases consisting of cubic (Sr3A
 l2O6\, Ba3Al2H12O12)\, monoclinic (SrAl2O4\, SrAl4O7)\, hexagonal (Ba0.6Sr
 0.4Al2O4\, SrO\, BaAl2O4) and orthorhombic (BaH4O3) crystal structures. Tb
 3+ did not influence the structure of mixed phases of BaAl2O4/BaH4O3/Ba3Al
 2H12O12/Ba0.6Sr0.4Al2O4/SrAl2O4\,SrAl4O7/ Sr3Al2O6/SrO (BBBBSSSS). The ene
 rgy dispersive X-ray spectroscopy (EDS) mapping showed homogeneous distrib
 ution of elements on the surface. The scanning electron microscopy (SEM) i
 mages showed that as the AT increases the particle becomes more agglomerat
 ed and smoother. Transition electron microscopy (TEM) images suggested tha
 t the particle sizes were not influenced by the AT. Ultraviolet–visible 
 (UV–vis) diffuse reflection spectroscopy confirmed that AT influenced th
 e energy band gap (Eg) of the prepared nanophosphor. The Eg can be tuned b
 etween 5.1 and 5.7 eV. Photoluminescence (PL) results showed four emission
  peaks located around 489\, 546\, 589 and 618 nm which are attributed to 5
 D4 →7F6\, 5D4 →7F5\, 5D4 →7F4\, and 5D4 →7F3 transitions of Tb3+ i
 ons\, respectively.\n\nhttps://events.saip.org.za/event/206/contributions/
 7120/
LOCATION:North-West University Potchefstroom Campus
URL:https://events.saip.org.za/event/206/contributions/7120/
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