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Reinvestigation of KMg(1/3)Nb(2/3)OPO(4).

Babaryk AA, Bon V, Zatovsky IV, Slobodyanik NS, Pekhnyo V - Acta Crystallogr Sect E Struct Rep Online (2010)

Bottom Line: Solid State Chem.102, 354-361], has been redetermined in the revised space group P4(1).Accordingly, the assignment of the space group P4(3)22 and, therefore, localization of K at a single half-occupied position, as noted in the previous study, proved to be an artifact.It has been shown that the geometry of the {M(II) (1/3)Nb(2/3)O(6/2)}(∞) framework is almost unaffected by the lowering of symmetry.

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ABSTRACT
The crystal structure of potassium magnesium niobium oxide phosphate, KMg(1/3)Nb(2/3)OPO(4), which was described in the space group P4(3)22 [McCarron & Calabrese, (1993 ▶). J. Solid State Chem.102, 354-361], has been redetermined in the revised space group P4(1). Accordingly, the assignment of the space group P4(3)22 and, therefore, localization of K at a single half-occupied position, as noted in the previous study, proved to be an artifact. As a consequence, two major and two minor positions of K are observed due to the splitting along [001], as first noted for KTiOPO(4) structure analogues. It has been shown that the geometry of the {M(II) (1/3)Nb(2/3)O(6/2)}(∞) framework is almost unaffected by the lowering of symmetry.

No MeSH data available.


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View of the the asymmetric unit. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (i) -y+2, x, z+1/4 (ii) x+1, y, z; (iii) -y+1, x, z+1/4].
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Fap2: View of the the asymmetric unit. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (i) -y+2, x, z+1/4 (ii) x+1, y, z; (iii) -y+1, x, z+1/4].


Reinvestigation of KMg(1/3)Nb(2/3)OPO(4).

Babaryk AA, Bon V, Zatovsky IV, Slobodyanik NS, Pekhnyo V - Acta Crystallogr Sect E Struct Rep Online (2010)

View of the the asymmetric unit. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (i) -y+2, x, z+1/4 (ii) x+1, y, z; (iii) -y+1, x, z+1/4].
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2983719&req=5

Fap2: View of the the asymmetric unit. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (i) -y+2, x, z+1/4 (ii) x+1, y, z; (iii) -y+1, x, z+1/4].
Bottom Line: Solid State Chem.102, 354-361], has been redetermined in the revised space group P4(1).Accordingly, the assignment of the space group P4(3)22 and, therefore, localization of K at a single half-occupied position, as noted in the previous study, proved to be an artifact.It has been shown that the geometry of the {M(II) (1/3)Nb(2/3)O(6/2)}(∞) framework is almost unaffected by the lowering of symmetry.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
The crystal structure of potassium magnesium niobium oxide phosphate, KMg(1/3)Nb(2/3)OPO(4), which was described in the space group P4(3)22 [McCarron & Calabrese, (1993 ▶). J. Solid State Chem.102, 354-361], has been redetermined in the revised space group P4(1). Accordingly, the assignment of the space group P4(3)22 and, therefore, localization of K at a single half-occupied position, as noted in the previous study, proved to be an artifact. As a consequence, two major and two minor positions of K are observed due to the splitting along [001], as first noted for KTiOPO(4) structure analogues. It has been shown that the geometry of the {M(II) (1/3)Nb(2/3)O(6/2)}(∞) framework is almost unaffected by the lowering of symmetry.

No MeSH data available.


Related in: MedlinePlus