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Dimers [Al

2

N

6

]

12–

and Chains

1

1

[AlN

4/23–

] in the Crystal Structures of Ca

6

[Al

2

N

6

] and Ba

3

[Al

2

N

4

]

M. Ludwig

a

, R. Niewa

b

, R. Kniep

;a;b

aEduard-Zintl-Institut der Technischen Universit¨at, Hochschulstraße 10, D-64289 Darmstadt

bMax-Planck-Institut f¨ur Chemische Physik fester Stoffe, c/o VEM Sachsenwerk, Pirnaer Landstr. 176, D-01257 Dresden

Dedicated to Prof. P. B¨ottcher on the occasion of his 60thbirthday Z. Naturforsch.54 b,461–465 (1999); received December 18, 1998 Nitridoaluminates, Preparation, Crystal Structure

Pale yellow transparent single crystals of Ca6[Al2N6] (P21/c, No. 14, a = 693.7(3), b = 614.9(3), c = 987.1(5) pm,= 94.01(5); Z = 4) and colourless transparent single crystals of Ba3[Al2N4] (Pnna, No. 52, a = 617.9(2), b = 1005.2(4), c = 1023.0(4) pm; Z = 4) were obtained from reactions of mixtures of the representative metals with nitrogen at Tmax= 1000C. The crystal structure of Ca6[Al2N6] contains isolated units [Al2N6]12 built of two edge-sharing tetrahedra. Ba3[Al2N4] is an isotype of Sr3[Al2N4]. The crystal structure contains infinite chains

1

1

[AlN34

=2] of trans edge-sharing tetrahedra.

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