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New approach of synthesis of phosphate–sulfates with NZP-type structure
Ist Teil von
Journal of thermal analysis and calorimetry, 2017-03, Vol.127 (3), p.2093-2099
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2017
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
New approach of phosphate–sulfate synthesis, preventing sulfur elimination was proposed. It implies sulfur encasement into intermediate with heightened thermal resistance, thus the synthesis temperature of phosphate–sulfate could be increased, and crystallization can be performed. This method is considered to be capable by example of obtaining of Pb
2/3
FeZr(PO
4
)
7/3
(SO
4
)
2/3
ceramic. It was synthesized by means of sol–gel method via formation of intermediate PbSO
4
, which encased sulfur and eventually led to formation of mentioned before phosphate–sulfate. Obtained sample was characterized via X-ray, IR, combined DTA–TG, SEM and microprobe electron analysis. Crystal structure and unit cell parameters were derived from least-squares refinement of powder X-ray diffraction data (NZP-type, sp. gr.
R
3
¯
c
,
a
= 8.6339 Å,
c
= 23.2991 Å, V = 1504.1 Å
3
). Thermal expansion (
α
a
= 0.96·10
−6
,
α
c
= 3.24·10
−6
,
α
av
= 1.76·10
−6
K
−1
) of compound also has been studied. There is a wide area of interest, due to development of ceramics with low thermal expansion.
Graphical Abstract