The crystal structure of struvite, MgNH4PO4.6H2O

Whitaker, Α.; Jeffery, J. W.

doi:10.1107/s0567740870004284

Cited by 134 publications

(69 citation statements)

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“…The mean MgO distances are 2.088 and 2.091 A, respectively. These agree with those in MgHPO 4 (Sutor, 1967), Mg3(PO4) 2 (Nord & Kierkegaard, 1968), MgNH4PO 4.6HZO (Whitaker & Jeffery, 1970), MgKPO4.6H20 (Mathew & Schroeder, 1979), and MgHPO4.3H20 (Abbona, Boistelle & Haser, 1979). The shared edges (2.793, 2.725/k) are much shorter than the unshared edges (mean 2.956, 2.986/k).…”

confidence: 78%

The structure of synthetic dimagnesium diphosphate(V) dihydrate

Oka¹,

Kawahara²

1982

Acta Crystallogr Sect B

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confidence: 78%

The structure of synthetic dimagnesium diphosphate(V) dihydrate

Oka¹,

Kawahara²

1982

Acta Crystallogr Sect B

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“…Although the structural details of MgCsPO4.6H20 are unknown, some comparison can be made with the probably isostructural arsenate References: (a) Whitaker & Jeffery (1970). (b) Mathew & Schroeder (1979).…”

Section: Ld-ha (°)mentioning

confidence: 99%

The structure of sodium strontium phosphate nonahydrate

Takagi¹,

Mathew²,

Brown³

1982

Acta Crystallogr Sect B

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STRUCTURE OF LITHIUM SODIUM YTTRIUM SILICATE Na2LiYSi6Ol5 many types of metasilicate rings, e.g. Si309, Si4012, Si6018, Si12036.One peculiarity of the Sechser-Doppelkette unit is that, unlike other metasilicate units, it does persist essentially unchanged in a wide variety of structures containing ions of different charges in octahedral sites, e.g. M 2+, M 3+ and M 4+, as well as different numbers of charge-balancing cations. Thus, in the series NaELiM3+Si6015, stable phase formation occurs for octahedral ions as small as Fe 3+ (0.66 A) and as large as Sm 3+ (0.96 A). The present structure determination was undertaken because Y (0.90 A) is amongst the largest trivalent ions which can be substituted in melt-grown crystals.In the compounds Na2MgESi6015, NaELiFeSi60~5, NaLiZrSi6015 and Na2LiYSi6015 the following features are observed. In the unit cells of these compounds the c axis, which is parallel to the direction of propagation of the silicate double chains and is thus a rough measure of the degree to which the chains are folded, lies in the relatively narrow range 10.072-10.375 A. Also, the Si-O-Si angles are similar in all four. Thus the silicate chain constitutes a stable and relatively inflexiblc building unit. Again, in all cases there is marked distortion of the bond angles at the tetrahedral site. We conclude, therefore, that this distortion enables the structure to accommodate a wide range of cations on the octahedral sites without necessitating changes to the Sechser-Doppelkette unit. AbstractThe crystal structure of SrNaPO4.9H20 has been determined by single-crystal X-ray diffraction. The crystals are cubic, a = 10.544 (2) A, space group P2~3, with Z = 4, Pm = 2.11, Pc = 2.083 g cm -3. The structure was refined by full-matrix least-squares techniques to R = 0.025 and R w = 0.026 for the 323 reflections used in the refinement. All cations and anions are completely surrounded by water molecules. All nine water molecules are coordinated to the same Sr 2+ ion, forming a tricapped trigonal prism. The Na + ion is coordinated to six water molecules, forming a distorted octahedron. Extensive edge-sharing of Sr(H20) 9 and Na(H20)6 polyhedra exists. The environment of the PO]-ion consists of 15 water molecules all of which are probably hydrogen bonded to PO 4 oxygens. However, there is considerable disordering of the phosphate O atoms, somewhat similar to those of SO 4 groups in alums.

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“…In either case it would appear that the atomic arrangement of the heavier atoms about the water oxygens is significantly not coplanar and this is different from the case of the Mg. (H20)6 octahedron, where it is (Baur, 1964;Whitaker & Jeffery, 1970;Whitaker, 1973). Another point emerges: if the H atom associated with 0(2) is H(23), could this be involved in a hydrogen bond to 0(3)?…”

Section: Zno6 Octahedronmentioning

confidence: 99%

The crystal structure of hopeite, Zn₃(PO₄)₂.4H₂O

Whitaker¹

1975

Acta Crystallogr B Struct Sci

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The crystal structure of struvite, MgNH₄PO₄.6H₂O

Cited by 134 publications

References 4 publications

The structure of synthetic dimagnesium diphosphate(V) dihydrate

The structure of synthetic dimagnesium diphosphate(V) dihydrate

The structure of sodium strontium phosphate nonahydrate

The crystal structure of hopeite, Zn₃(PO₄)₂.4H₂O

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The crystal structure of struvite, MgNH4PO4.6H2O

Cited by 134 publications

References 4 publications

The structure of synthetic dimagnesium diphosphate(V) dihydrate

The structure of synthetic dimagnesium diphosphate(V) dihydrate

The structure of sodium strontium phosphate nonahydrate

The crystal structure of hopeite, Zn3(PO4)2.4H2O

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The crystal structure of struvite, MgNH₄PO₄.6H₂O

The crystal structure of hopeite, Zn₃(PO₄)₂.4H₂O