Abstract
New compounds were obtained by arc-melting and characterized by X-ray diffraction on single crystal or on powder sample. The compounds crystallize with own types of structure: iso-structural La4Co3Al3 and La4Ni3Al3 with non-centrosymmetric space group Amm2 and Z = 2 (a = 4.148(5), b = 10.111(7), c = 10.601(7) Å for La4Co3Al3 and a = 4.1895(7), b = 10.0465(15), c = 10.6538(16) Å for La4Ni3Al3). In contrast, iso-stoichiometric La4Co5Al2 and La4Ni5Al2 are not iso-structural. La4Co5Al2 crystallizes in space group Pnnm, Z = 2, a = 8.2997(11), b = 13.5982(15), c = 4.1160(6) Å. La4Ni5Al2 adopts a site exchange variant of Ca4Ni4Ge3 structure: Cmcm, Z = 4, a = 4.1848(6), b = 10.3177(13), c = 21.033(2) Å. Structural peculiarity of all the compounds are infinite corrugated M/Al layers between which La atoms are situated.
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