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Structure, infrared and Raman spectroscopic studies of new Sr0.50SbFe(PO4)3 and SrSb0.50Fe1.50(PO4)3 Nasicon phases
Two newly synthesised Sr 0.50 SbFe(PO 4 ) 3 [Sr 0.5 .] and SrSb 0.50 Fe 1.50 (PO 4 ) 3 [Sr.] phases were obtained by conventional solid-state reaction techniques at 1000 °C in air atmosphere. Their crystallographic structures were determined at room temperature from X-ray powder diffraction (XRPD) d...
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| Published in: | Journal of materials science 2012-02, Vol.47 (3), p.1354-1364 |
|---|---|
| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Two newly synthesised Sr
0.50
SbFe(PO
4
)
3
[Sr
0.5
.] and SrSb
0.50
Fe
1.50
(PO
4
)
3
[Sr.] phases were obtained by conventional solid-state reaction techniques at 1000 °C in air atmosphere. Their crystallographic structures were determined at room temperature from X-ray powder diffraction (XRPD) data using the Rietveld analysis. Both compounds belong to the Nasicon structural family. [Sr
0.5
.] and [Sr.] crystallise in rhombohedral system with
and
space group, respectively. Hexagonal cell parameters for [Sr
0.5
.] and [Sr.] are:
a
= 8.227(1) Å,
c
= 22.767(2) Å and
a
= 8.339(1) Å,
c
= 22.704(2) Å, respectively. Sr
2+
and vacancies in {[Sr
0.50
]
3a
[□
0.50
]
3b
}
M1
SbFe(PO
4
)
3
are practically ordered within the two positions, 3a and 3b, of M1 sites. Structure refinements show also an ordered distribution of Sb
5+
and Fe
3+
ions within the Nasicon framework. Within the structure, each Sr
(3a)
O
6
octahedron shares two faces with two Fe
3+
O
6
octahedra and each vacancy (□
(3b)
O
6
) site is located between two Sb
5+
O
6
octahedra. In [Sr]
M1
Sb
0.50
Fe
1.50
(PO
4
)
3
compound, all M1 sites are occupied by Sr
2+
and the Sb
5+
and Fe
3+
ions are randomly distributed within the Nasicon framework. A Raman and infrared spectroscopic study was used to obtain further structural information about the nature of bonding in both selected compositions. |
|---|---|
| ISSN: | 0022-2461 1573-4803 |
| DOI: | 10.1007/s10853-011-5910-0 |