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Russian journal of inorganic chemistry, 2018-06, Vol.63 (6), p.714-724
Ort / Verlag
Moscow: Pleiades Publishing
Erscheinungsjahr
2018
Link zum Volltext
Quelle
SpringerLink
Beschreibungen/Notizen
NaZr
2–
x
B
x
(PO
4
)
3–2
x
(SO
4
)
2
x
(0 ≤
x
≤ 1.25, B = Mg, Co, Ni, Cu, Zn), and NaZr
2–
x
R
x
(PO
4
)
3–
x
(SO
4
)
x
(0 ≤
x
≤ 1.25, R = Al, Fe) phosphate-sulfates series have been prepared by a sol–gel process. These compounds belong to the NaZr
2
(PO
4
)
3
(NZP) structure family and crystallize in hexagonal crystal system, space group
R
3
¯
c
. Limited solid solution series were found to exist; their formation temperatures and thermal stability limits were determined. Particle sizes as determined by microstructure observation were 50–200 nm, and for Cu- and Zn-containing samples, 200–500 nm. The thermal expansion of phosphate-sulfate NaZr
1.25
Cu
0.75
(PO
4
)
1.5
(SO
4
)
1.5
was studied in the range 25–700°C. Thermal expansion coefficients and thermal expansion anisotropy were found to be α
a
=–5.40 × 10
–6
°C
–1
, α
с
= 18.88 × 10
–6
°C
–1
, α
avg
= 2.69 × 10
–6
°C
–1
, and Δα = 24.28 × 10
–6
°C
–1
.