title: Reinvestigation of KMg(1/3)Nb(2/3)OPO(4).
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.
authors.forename: Artem A
authors.initials: AA
authors.lastname: Babaryk
authors.forename: Vladimir
authors.initials: V
authors.lastname: Bon
authors.forename: Igor V
authors.initials: IV
authors.lastname: Zatovsky
authors.forename: Nikolay S
authors.initials: NS
authors.lastname: Slobodyanik
authors.forename: Vasily
authors.initials: V
authors.lastname: Pekhnyo