Synthesis and Crystal Structure of Cubic Ca16Si17N34

    Authors

    S. M. Hick; M. I. Miller; R. B. Kaner;R. G. Blair

    Comments

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    Abbreviated Journal Title

    Inorg. Chem.

    Keywords

    NA FLUX; GROWTH; NITRIDES; PHOSPHOR; LUMINESCENCE; CASIN2; SYSTEM; ALN; GAN; Chemistry, Inorganic & Nuclear

    Abstract

    Since the late 1960s, the exact structure of cubic calcium silicon nitride has been a source of debate. This paper offers evidence that the cubic phase CaSiN2 described in the literature is actually Ca16Si17N34. Presented here is a method for synthesizing single crystals of cubic-calcium silicon nitride from calcium nitride and elemental silicon under flowing nitrogen at 1500 degrees C. The colorless millimeter-sized crystals of Ca16Si17N34 with a refractive index (n(25)) = 1.590 were found to be cubic (a = 14.8882 angstrom) and belong to the space group F (4) over bar 3m (216). The synthesis of bulk, powdered cubic-Ca16Si17N34 from calcium cyanamide and silicon is also discussed. Ca16Si17N34 is a relatively air-stable refractory ceramic. In contrast to the orthorhombic phase of CaSiN2, in which Ca2+ sits in octahedral sites, this cubic phase has Ca2+ in cubic sites that makes it an interesting host for new phosphors and gives rise to unique crystal field splitting.

    Journal Title

    Inorganic Chemistry

    Volume

    51

    Issue/Number

    23

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    12626

    Last Page

    12629

    WOS Identifier

    WOS:000311772600008

    ISSN

    0020-1669

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