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Journal Article

Sr3[Al2N4]: Ein Nitridoaluminat mit gewellten Tetraederketten ∞1[Al4/23-]

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Citation

Blase, W., Cordier, G., Ludwig, M., & Kniep, R. (1994). Sr3[Al2N4]: Ein Nitridoaluminat mit gewellten Tetraederketten ∞1[Al4/23-]. Zeitschrift für Naturforschung Section B-A Journal of Chemical Sciences, 49(4), 501-505.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-BA6C-7
Abstract
Sr-3[Al2N4] (Pnna, Nr. 52; a = 590.1(3), b = 1000.5(5), c = 958.0(4) pm; Z = 4) was prepared from the elements (molar ratio Sr:Al = 3:1; reaction with N-2, 1 atm, 24 h; T-max = 1100 degrees C). The crystal structure contains corrugated chains (1)(infinity)[AlN4/23-] which consist of distorted AlN4 tetrahedra sharing common edges (Al-N: 188.5(7)-195.8(7) pm; N-Al-N: 95.0(3)-126.0(5)degrees). The nitrogen atoms form a distorted ccp arrangement. 3/4 of the octahedral holes are occupied by Sr atoms; 1/4 of the tetrahedral holes are occupied by Al atoms. Sr-3[Al2N4] can be described in terms of the Zintl concept (isosteric relation of[AlN2](3-) to SiS2).