Počet záznamů: 1

Modulated structure of nepheline

  1. 1.
    0363715 - FZU-D 2012 RIV DK eng J - Článek v odborném periodiku
    Friese, K. - Grzechnik, A. - Petříček, Václav - Schönleber, A. - van Smaalen, S. - Morgenroth, W.
    Modulated structure of nepheline.
    Acta Crystallographica section B - Structural Science. Roč. 67, č. 2 (2011), 18-29 ISSN 0108-7681
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: structure analysis * modulated structures * nepheline
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.286, rok: 2011

    The incommensurately modulated structure of a natural nepheline of composition K0.54Na3.24Ca0.03Al3.84Si4.16O16 has been determined in superspace. The compound crystallizes in the trigonal centered superspace group X3(0,0,gamma00 with gamma = 0.2048 (10), X= (0, 0, 0, 0), (1/3, 2/3, 0, 2/3), (2/3, 1/3, 0, 1/3). The structure is characterized by a framework of corner-connected (Al,Si)O4 tetrahedra. The additional cations are incorporated in two different types of channels of the framework. All atoms in the structure are displacively modulated with amplitudes below 0.1 Angstroem.
    Trvalý link: http://hdl.handle.net/11104/0199417