A SUPERSPACE APPROACH TO THE MODULATED STRUCTURES OF MA(X)TE(2) (M=NB,TA A=SI,GE 1/3-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1/2), EXEMPLIFIED BY NBGE3/7TE2

A VANDERLEE, M EVAIN, L MONCONDUIT, R BREC, S VANSMAALEN

    Research output: Contribution to journalArticleAcademicpeer-review

    19 Citations (Scopus)

    Abstract

    MA(x)Te(2) (M = Ta, Nb and A = Si, Ge) compounds show a great variety of commensurately and incommensurately modulated structures depending on the value for x. It is shown that the theory of superspace groups can be used to standardize the structures and to predict the 3D symmetry of the commensurately modulated structures. The commensurately modulated structure of NbGe3/7Te2 is determined with the aid of single crystal x-ray data. A comparison with some already published structures in the series shows that all structures with 1/3 less than or equal to x less than or equal to 1/2 can be regarded as being built from definite numbers of units of the MA(1/3)Te(2) and MA(1/2)Te(2) type.

    Original languageEnglish
    Pages (from-to)933-944
    Number of pages12
    JournalJournal of Physics-Condensed Matter
    Volume6
    Issue number5
    Publication statusPublished - 31-Jan-1994

    Keywords

    • TELLURIDE
    • CRYSTALS

    Cite this