Chemistry Reference
In-Depth Information
Table 6.1
(Cont'd)
Synthesis method
(starting materials)
General steps
Reaction conditions
(temp/pressure)
Pros and/or cons
Size of particles
•
Dried precipitates
undergo calcination
treatment
Calcination at 500-
850°C for 2 h under
reduction atmosphere
of CO. Amorphous
precursor calcined
at below 850°C. Pure
phosphor calcined at
1000°C
Sol-gel
(Y(NO
•
Multiple dropwise
addition and mixing
of materials.
Water bath of 60-80°C.
Starting materials has higher
reactivity, molecular mixing
of constituents leads to
chemical homogeneity and
shorter diffusion distances
for the reactants led to lower
calcinations temperatures.
Steps quite tedious.
)
, KAl(SO
)
,
3
3
4
2
Ce(NO
· with a
chelating agent like
citric acid, C
)
Solution heated at
around 120 or 180°C in
an electric oven for 24 h.
3
3
•
Stirring in water
bath, followed by
heating in an oven.
H
O
7
·H
O
6
8
2
and polymerisation
agent, Ethylene Glycol
(EG) .)
•
Further heating to
obtain amorphous
gel.
Heating at 400°C or
600°C for 2 h.
